22 changed files with 255 additions and 584 deletions
--- a/client/src/app.ts
+++ b/client/src/app.ts
@ -11,7 +11,6 @@ import { renderAlbum } from './views/album/Album';
 import { renderPlaylist } from './views/playlist/Playlist';
 import { renderPartyPlayer } from './views/player/Player';
 import { renderStaticParty } from './views/staticParty/StaticParty';
-import { renderStaticParties } from './views/staticParties/StaticParties';

 route('/', () => navigate('/home'));
 route('/login', renderLogin);
@ -22,7 +21,6 @@ route('/artist/:id', renderArtist);
 route('/album/:id', renderAlbum);
 route('/playlist/:id', renderPlaylist);
 route('/party/:id', renderPartyPlayer);
-route('/static', renderStaticParties);
 route('/static/:id', renderStaticParty);

 /**
--- a/client/src/shell/Shell.html
+++ b/client/src/shell/Shell.html
@ -3,7 +3,6 @@
    <div class="sidebarBrand">Watch Party</div>
    <nav class="sidebarNav" id="sidebarNav">
      <a href="#/home" class="navItem">Accueil</a>
-      <a href="#/static" class="navItem">Lounge parties</a>
      <div class="navSectionLabel">Bibliothèques</div>
      <p class="hint" id="libStatus"><span class="spinner"></span>Chargement...</p>
    </nav>
@ -42,7 +41,6 @@
         plain scrim tap-only close used to leave unsolved). -->
    <div class="sheetGrabberHandle" id="sheetGrabberHandle"><div class="sheetGrabber"></div></div>
    <a href="#/home" class="navItem sheetPrimary"><span class="navIcon" data-icon="home"></span>Accueil</a>
-    <a href="#/static" class="navItem sheetPrimary"><span class="navIcon" data-icon="static"></span>Lounge parties</a>
    <div class="navSectionLabel">Bibliothèques</div>
    <div class="sheetGrid" id="mobileLibGrid"></div>
    <div id="mobilePlaylistsSlot"></div>
--- a/client/src/shell/Shell.ts
+++ b/client/src/shell/Shell.ts
@ -18,8 +18,6 @@ const SHOWS_ICON_SVG = '<svg viewBox="0 0 24 24"><rect x="3" y="5.5" width="18"
 const MUSIC_ICON_SVG = '<svg viewBox="0 0 24 24"><circle cx="8" cy="17" r="2.6" fill="none" stroke="currentColor" stroke-width="1.8"/><path d="M10.5 17V5.5l7-1.5v10" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round"/><circle cx="17.5" cy="14" r="2.6" fill="none" stroke="currentColor" stroke-width="1.8"/></svg>';
 const MUSICVIDEOS_ICON_SVG = '<svg viewBox="0 0 24 24"><rect x="3" y="5.5" width="18" height="13" rx="1.5" fill="none" stroke="currentColor" stroke-width="1.8"/><path d="M10 9.5 15.5 12 10 14.5Z" fill="currentColor"/></svg>';
 const PLAYLISTS_ICON_SVG = '<svg viewBox="0 0 24 24"><circle cx="4.5" cy="7" r="1.3" fill="currentColor"/><circle cx="4.5" cy="12" r="1.3" fill="currentColor"/><circle cx="4.5" cy="17" r="1.3" fill="currentColor"/><line x1="9" y1="7" x2="20" y2="7" stroke="currentColor" stroke-width="1.8" stroke-linecap="round"/><line x1="9" y1="12" x2="20" y2="12" stroke="currentColor" stroke-width="1.8" stroke-linecap="round"/><line x1="9" y1="17" x2="20" y2="17" stroke="currentColor" stroke-width="1.8" stroke-linecap="round"/></svg>';
-// The "Lounge parties" tab (static watch parties) - a circular "resume" arrow.
-const STATIC_PARTIES_ICON_SVG = '<svg viewBox="0 0 24 24"><path d="M19.5 12a7.5 7.5 0 1 1-2.2-5.3" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round"/><path d="M19.5 4v4h-4" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round"/><path d="M10 9l5 3-5 3Z" fill="currentColor"/></svg>';
 // Emby could in principle add a CollectionType this app doesn't map yet
 // (server/src/services/CatalogService.ts's VISIBLE_COLLECTION_TYPES
 // would need updating first either way) - falls back to a plain folder
@ -55,7 +53,6 @@ export async function renderShell(appEl: HTMLElement): Promise<HTMLElement> {
  appEl.innerHTML = html;

  appEl.querySelector('[data-icon="home"]')!.innerHTML = HOME_ICON_SVG;
-  appEl.querySelector('[data-icon="static"]')!.innerHTML = STATIC_PARTIES_ICON_SVG;

  // Mounted once, outside #mainContent, so a listen party survives
  // navigating the router - see musicBar/MusicBar.ts's header comment.
@ -101,11 +98,8 @@ export async function renderShell(appEl: HTMLElement): Promise<HTMLElement> {

  const highlight = () => {
    appEl.querySelectorAll('.navItem').forEach((a) => {
-      const href = a.getAttribute('href');
-      const isHome = href === '#/home';
-      // The static-parties tab stays highlighted on one party's own page too.
-      const isStaticSection = href === '#/static' && location.hash.startsWith('#/static/');
-      a.classList.toggle('active', href === location.hash || (isHome && !location.hash) || isStaticSection);
+      const isHome = a.getAttribute('href') === '#/home';
+      a.classList.toggle('active', a.getAttribute('href') === location.hash || (isHome && !location.hash));
    });
  };
  highlight();
--- a/client/src/tiles.ts
+++ b/client/src/tiles.ts
@ -61,9 +61,7 @@ const DRILL_DOWN: Record<string, { route: string; label: string }> = {
 function posterTileHtml(item: ItemDto): string {
  const drill = item.type ? DRILL_DOWN[item.type] : undefined;
  const drillHref = drill ? `#/${drill.route}/${item.id}` : null;
-  // Video -> "watch party", audio -> "listen party" - see the party kinds
-  // in docs/architecture.md (the third, "lounge party", is the static one).
-  const partyLabel = item.type === 'Audio' ? 'Lancer une listen party' : 'Lancer une watch party';
+  const partyLabel = item.type === 'Audio' ? 'Écouter ensemble' : 'Lancer une watch party';
  return `
    <div class="tile">
      ${drillHref ? `<a href="${drillHref}" class="tileLink" aria-label="${escapeHtml(item.name)}"></a>` : ''}
@ -118,7 +116,7 @@ export function tileHtml(item: ItemDto): string {
 }

 /**
- * Wires up every "Lancer une watch/listen party" button inside `container`, now
+ * Wires up every "Lancer une watch party" button inside `container`, now
 * and for any tile added to it later. `onStart(itemId)` does the actual
 * work (create the party + navigate) - kept as a caller-supplied callback
 * so this module doesn't need to depend on api/party.ts/router.ts itself.
@ -134,7 +132,6 @@ export function wireTileButtons(container: ParentNode, onStart: (itemId: string)
    const btn = (e.target as HTMLElement).closest<HTMLButtonElement>('.startPartyBtn');
    if (!btn || btn.disabled) return;
    e.preventDefault();
-    const idleLabel = btn.textContent; // "watch party" or "listen party" - put back as-is on failure
    btn.disabled = true;
    btn.textContent = 'Démarrage...';
    try {
@ -142,7 +139,7 @@ export function wireTileButtons(container: ParentNode, onStart: (itemId: string)
    } catch (err) {
      showToast((err as Error).message, { variant: 'error' });
      btn.disabled = false;
-      btn.textContent = idleLabel;
+      btn.textContent = 'Lancer une watch party';
    }
  });
 }
--- a/client/src/views/album/Album.ts
+++ b/client/src/views/album/Album.ts
@ -69,7 +69,7 @@ export async function renderAlbum(root: HTMLElement, params: RouteParams): Promi
  // states) - the label lives in aria-label/title for accessibility
  // rather than as visible text, now that there's one per track instead
  // of one per page (see docs/architecture.md's "Music UI rework").
-  const startLabel = 'Lancer une listen party';
+  const startLabel = 'Écouter ensemble';
  const addLabel = 'Ajouter à la file';
  const startAlbumLabel = 'Écouter cet album';
  const addAlbumLabel = "Ajouter l'album à la file";
--- a/client/src/views/home/Home.css
+++ b/client/src/views/home/Home.css
@ -61,17 +61,40 @@
  font-weight: 600;
 }

-/* Which kind of party a card is - "Watch party" (video) or "Listen party"
-   (audio). Lounge parties (static) have their own tab, never this list. */
-.partyKind {
-  align-self: flex-start;
-  font-size: 10px;
-  font-weight: 700;
-  letter-spacing: .06em;
-  text-transform: uppercase;
-  padding: 1px 6px;
-  border-radius: 4px;
+/* ---- Static (persistent) watch parties ----
+   A whole card is the link (to /static/:id) - reuses .partyCard's layout,
+   minus the default anchor styling. */
+.staticCard {
+  color: inherit;
+  text-decoration: none;
 }

-.partyKind--video { color: var(--accent-bright); background: rgba(82, 181, 75, .15); }
-.partyKind--music { color: #7fb4ff; background: rgba(127, 180, 255, .15); }
+.staticCard:hover { background: #2b252e; }
+
+.staticCardLive {
+  color: var(--accent-bright);
+  font-size: 12px;
+  font-weight: 600;
+}
+
+.staticCardMissed {
+  flex-shrink: 0;
+  padding: 4px 10px;
+  border-radius: 12px;
+  background: var(--danger);
+  color: #fff;
+  font-size: 12px;
+  font-weight: 600;
+}
+
+/* A live session's link back to the static watch party it belongs to. */
+.partyCardStatic {
+  color: var(--accent-bright);
+  font-size: 12px;
+  text-decoration: none;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.partyCardStatic:hover { text-decoration: underline; }
--- a/client/src/views/home/Home.html
+++ b/client/src/views/home/Home.html
@ -3,8 +3,13 @@
 </div>

 <section class="section" id="partiesSection" hidden>
-  <h2>Parties en cours</h2>
+  <h2>Watch parties en cours</h2>
  <div id="partiesCarousel" class="carousel"></div>
 </section>

+<section class="section" id="staticSection" hidden>
+  <h2>Watch parties permanentes</h2>
+  <div id="staticCarousel" class="carousel"></div>
+</section>
+
 <div id="recentSections"></div>
--- a/client/src/views/home/Home.ts
+++ b/client/src/views/home/Home.ts
@ -7,7 +7,8 @@ import { navigate } from '../../router';
 import { escapeHtml, tileHtml, wireTileButtons } from '../../tiles';
 import { LOADING_HINT } from '../../loading';
 import { showToast } from '../../toast';
-import type { LobbyPartyDto } from '../../types';
+import { listStaticParties } from '../../api/staticParty';
+import type { LobbyPartyDto, StaticPartySummaryDto } from '../../types';

 export function renderHome(root: HTMLElement): () => void {
  root.innerHTML = html;
@ -18,9 +19,20 @@ export function renderHome(root: HTMLElement): () => void {
  // label is the one piece that ticks purely client-side (from
  // createdUtc) - no point re-pushing from the server once a second just
  // for a clock.
-  // A static watch party's sessions live in their own tab
-  // (views/staticParties), not here - this list is classic parties only.
-  const lobby = connectLobby((parties) => renderParties(root, parties.filter((p) => !p.staticPartyId)));
+  // Static watch parties are a REST fetch (their data changes rarely), but
+  // re-fetched whenever the set of live static-party sessions in the lobby
+  // changes - a session starting/ending is what moves their cards'
+  // "en cours"/progress state. Not on every lobby snapshot: those also
+  // fire on every pause/join, and each static-party fetch reads Emby.
+  let staticSessionsKey: string | null = null;
+  const lobby = connectLobby((parties) => {
+    renderParties(root, parties);
+    const key = parties.map((p) => p.staticPartyId).filter(Boolean).sort().join(',');
+    if (key !== staticSessionsKey) {
+      staticSessionsKey = key;
+      loadStaticParties(root);
+    }
+  });
  const elapsedTimer = window.setInterval(() => updateElapsedLabels(root), 1000);

  loadRecentSections(root);
@ -59,8 +71,8 @@ function renderParties(root: HTMLElement, parties: LobbyPartyDto[]): void {
    <div class="partyCard">
      <img class="${p.mediaType === 'music' ? 'partyCardArt--square' : ''}" src="${p.itemImageUrl || ''}" alt="" onerror="this.classList.add('noImage')" />
      <div class="partyCardInfo">
-        <span class="partyKind partyKind--${p.mediaType}">${p.mediaType === 'music' ? 'Listen party' : 'Watch party'}</span>
        <strong>${escapeHtml(p.itemName || '')}</strong>
+        ${p.staticPartyId ? `<a class="partyCardStatic" href="#/static/${escapeHtml(p.staticPartyId)}">↻ ${escapeHtml(p.staticPartyName || '')}</a>` : ''}
        <span class="hint">
          ${escapeHtml(p.hostUserName || '')} · ${p.memberCount} participant${p.memberCount > 1 ? 's' : ''}
          · <span class="elapsed"
@ -96,6 +108,39 @@ function renderParties(root: HTMLElement, parties: LobbyPartyDto[]): void {
  updateElapsedLabels(root);
 }

+/** Fetches and renders the "Watch parties permanentes" section - hidden
+ *  when there are none. A failure only hides the section: the rest of the
+ *  home page doesn't depend on it. */
+function loadStaticParties(root: HTMLElement): void {
+  listStaticParties()
+    .then((parties) => renderStaticParties(root, parties))
+    .catch((err: unknown) => {
+      console.error('[home] static parties failed to load', err);
+      const section = root.querySelector('#staticSection') as HTMLElement | null;
+      if (section) section.hidden = true;
+    });
+}
+
+/** One card per static watch party: progress, the viewer's missed count,
+ *  and whether a session is running right now. */
+function renderStaticParties(root: HTMLElement, parties: StaticPartySummaryDto[]): void {
+  const section = root.querySelector('#staticSection') as HTMLElement | null;
+  const list = root.querySelector('#staticCarousel');
+  if (!section || !list) return; // navigated away mid-flight
+  section.hidden = !parties.length;
+  list.innerHTML = parties.map((p) => `
+    <a class="partyCard staticCard" href="#/static/${escapeHtml(p.id)}">
+      <img src="${escapeHtml(p.imageUrl)}" alt="" onerror="this.classList.add('noImage')" />
+      <div class="partyCardInfo">
+        <strong>${escapeHtml(p.name)}</strong>
+        <span class="hint">${p.groupWatchedCount}/${p.itemCount} vus · ${p.memberCount} membre${p.memberCount > 1 ? 's' : ''}</span>
+        ${p.livePartyId ? '<span class="staticCardLive">● Séance en cours</span>' : ''}
+      </div>
+      ${p.missedCount ? `<span class="staticCardMissed" title="Éléments manqués">${p.missedCount} manqué${p.missedCount > 1 ? 's' : ''}</span>` : ''}
+    </a>
+  `).join('');
+}
+
 const TICKS_PER_SECOND = 10000000; // Emby/.NET convention: 1 tick = 100ns, same as everywhere else this app touches durations/positions

 /**
--- a/client/src/views/playlist/Playlist.html
+++ b/client/src/views/playlist/Playlist.html
@ -6,7 +6,7 @@
    <p class="hint" id="playlistMeta"></p>
    <div class="playlistActions">
      <button id="launchBtn">Lancer cette playlist</button>
-      <button class="hide" id="createStaticBtn">Créer une lounge party</button>
+      <button class="hide" id="createStaticBtn">Créer une watch party permanente</button>
      <a class="linklike" id="embyLink" target="_blank" rel="noopener">Voir sur Emby</a>
    </div>
  </div>
--- a/client/src/views/series/Series.html
+++ b/client/src/views/series/Series.html
@ -5,7 +5,7 @@
    <h1 id="seriesTitle"></h1>
    <p class="seriesOverview hide" id="seriesOverview"></p>
    <div class="seriesActions">
-      <button id="createStaticBtn">Créer une lounge party</button>
+      <button id="createStaticBtn">Créer une watch party permanente</button>
      <a class="linklike" id="embyLink" target="_blank" rel="noopener">Voir sur Emby</a>
    </div>
  </div>
--- a/client/src/views/staticParties/StaticParties.css
+++ b/client/src/views/staticParties/StaticParties.css
@ -1,81 +0,0 @@
-/* ---- "Lounge parties" tab: one card per static party ---- */
-
-.staticGrid {
-  display: grid;
-  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
-  gap: 14px;
-}
-
-/* The whole card is the link to /static/:id. */
-.staticCard {
-  display: flex;
-  align-items: center;
-  gap: 14px;
-  background: var(--bg-header);
-  border-radius: 10px;
-  padding: 12px;
-  color: inherit;
-  text-decoration: none;
-}
-
-.staticCard:hover { background: #2b252e; }
-
-.staticCard img {
-  width: 60px;
-  height: 90px;
-  object-fit: cover;
-  border-radius: 6px;
-  background: var(--panel);
-  flex-shrink: 0;
-}
-
-.staticCard img.noImage { visibility: hidden; }
-
-.staticCardInfo {
-  flex: 1;
-  min-width: 0;
-  display: flex;
-  flex-direction: column;
-  gap: 4px;
-}
-
-.staticCardInfo strong { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
-.staticCardInfo .hint { margin: 0; }
-
-.staticCardNext {
-  font-size: 12px;
-  color: var(--muted);
-  white-space: nowrap;
-  overflow: hidden;
-  text-overflow: ellipsis;
-}
-
-.staticCardBar {
-  height: 4px;
-  border-radius: 2px;
-  background: var(--panel);
-  overflow: hidden;
-}
-
-.staticCardBar > div { height: 100%; background: var(--accent); }
-
-.staticCardLive {
-  color: var(--accent-bright);
-  font-size: 12px;
-  font-weight: 600;
-}
-
-.staticCardMissed {
-  flex-shrink: 0;
-  align-self: flex-start;
-  padding: 4px 10px;
-  border-radius: 12px;
-  background: var(--danger);
-  color: #fff;
-  font-size: 12px;
-  font-weight: 600;
-}
-
-@media (max-width: 400px) {
-  .staticGrid { grid-template-columns: 1fr; }
-}
--- a/client/src/views/staticParties/StaticParties.html
+++ b/client/src/views/staticParties/StaticParties.html
@ -1,9 +0,0 @@
-<div class="pageHeader">
-  <h1>Lounge parties</h1>
-</div>
-<p class="hint">
-  Une série ou une playlist regardée en groupe sur plusieurs séances : la progression du groupe
-  et celle de chacun sont gardées en mémoire. Pour en créer une, ouvre une série ou une playlist
-  vidéo et choisis « Créer une lounge party ».
-</p>
-<div class="staticGrid" id="staticGrid"></div>
--- a/client/src/views/staticParties/StaticParties.ts
+++ b/client/src/views/staticParties/StaticParties.ts
@ -1,76 +0,0 @@
-import './StaticParties.css';
-import html from './StaticParties.html';
-import { connectLobby } from '../../api/party';
-import { listStaticParties } from '../../api/staticParty';
-import { escapeHtml } from '../../tiles';
-import { LOADING_HINT } from '../../loading';
-import type { StaticPartySummaryDto } from '../../types';
-
-/**
- * Route `/static` - the "Lounge parties" tab: every static
- * watch party, kept apart from the home page's classic live parties
- * (whose lobby list leaves static sessions out - see Home.ts).
- *
- * A REST list, re-fetched whenever the set of live static-party sessions
- * in the lobby changes (a session starting or ending is what moves a
- * card's "séance en cours"/progress state). Not on every lobby snapshot:
- * those also fire on every pause/join, and each list fetch reads Emby
- * once per static party (see server/src/index.ts's syncStaticSource).
- */
-export function renderStaticParties(root: HTMLElement): () => void {
-  root.innerHTML = html;
-  const grid = root.querySelector('#staticGrid') as HTMLElement;
-  grid.innerHTML = LOADING_HINT;
-
-  let sessionsKey: string | null = null;
-  const lobby = connectLobby((parties) => {
-    const key = parties.map((p) => p.staticPartyId).filter(Boolean).sort().join(',');
-    if (key === sessionsKey) return;
-    sessionsKey = key;
-    load(grid);
-  });
-
-  // Same leak-prevention contract as Home.ts: the router calls this before
-  // rendering the next view.
-  return function cleanup() {
-    lobby.disconnect();
-  };
-}
-
-/** Fetches and renders every static party into `grid`. */
-function load(grid: HTMLElement): void {
-  listStaticParties()
-    .then((parties) => {
-      if (!grid.isConnected) return; // navigated away mid-flight
-      render(grid, parties);
-    })
-    .catch((err: unknown) => {
-      console.error('[staticParties] list failed to load', err);
-      if (grid.isConnected) grid.innerHTML = `<p class="error">${escapeHtml((err as Error).message)}</p>`;
-    });
-}
-
-/** One card per static party: progress, next item, the viewer's missed
- *  count, and whether a session is running right now. */
-function render(grid: HTMLElement, parties: StaticPartySummaryDto[]): void {
-  if (!parties.length) {
-    grid.innerHTML = '<p class="hint">Aucune lounge party pour le moment.</p>';
-    return;
-  }
-  grid.innerHTML = parties.map((p) => {
-    const percent = p.itemCount ? Math.round((p.groupWatchedCount / p.itemCount) * 100) : 0;
-    return `
-      <a class="staticCard" href="#/static/${escapeHtml(p.id)}">
-        <img src="${escapeHtml(p.imageUrl)}" alt="" loading="lazy" onerror="this.classList.add('noImage')" />
-        <div class="staticCardInfo">
-          <strong>${escapeHtml(p.name)}</strong>
-          <span class="hint">${p.sourceType === 'series' ? 'Série' : 'Playlist'} · ${p.groupWatchedCount}/${p.itemCount} vus · ${p.memberCount} membre${p.memberCount > 1 ? 's' : ''}</span>
-          <div class="staticCardBar"><div style="width:${percent}%"></div></div>
-          ${p.livePartyId
-            ? '<span class="staticCardLive">● Séance en cours</span>'
-            : `<span class="staticCardNext">${p.nextItemName ? `Prochain : ${escapeHtml(p.nextItemName)}` : 'Le groupe a tout vu.'}</span>`}
-        </div>
-        ${p.missedCount ? `<span class="staticCardMissed" title="Éléments manqués">${p.missedCount} manqué${p.missedCount > 1 ? 's' : ''}</span>` : ''}
-      </a>`;
-  }).join('');
-}
--- a/client/src/views/staticParty/StaticParty.html
+++ b/client/src/views/staticParty/StaticParty.html
@ -2,14 +2,14 @@
 <div class="staticHeader">
  <img class="staticCover" id="staticCover" alt="" loading="lazy" onerror="this.classList.add('noImage')" />
  <div class="seriesInfo">
-    <span class="staticBadge">Lounge party</span>
+    <span class="staticBadge">Watch party permanente</span>
    <h1 id="staticTitle"></h1>
    <p class="hint staticMeta" id="staticMeta"></p>
    <div class="staticProgress" aria-hidden="true"><div class="staticProgressFill" id="staticProgressFill"></div></div>
    <p class="staticNext" id="staticNext"></p>
    <div class="staticActions">
      <button id="sessionBtn">Lancer la séance</button>
-      <button class="secondaryBtn hide" id="joinBtn">Rejoindre cette lounge party</button>
+      <button class="secondaryBtn hide" id="joinBtn">Rejoindre cette watch party</button>
      <button class="linklike hide" id="leaveBtn">Quitter</button>
      <button class="linklike hide" id="deleteBtn">Supprimer</button>
    </div>
--- a/client/src/views/staticParty/StaticParty.ts
+++ b/client/src/views/staticParty/StaticParty.ts
@ -34,7 +34,7 @@ export async function renderStaticParty(root: HTMLElement, params: RouteParams):
    detail = await getStaticParty(staticId);
  } catch (err) {
    console.error('[staticParty] load failed', staticId, err);
-    root.innerHTML = `<p class="error">${escapeHtml((err as Error).message || 'Impossible de charger cette lounge party.')}</p>`;
+    root.innerHTML = `<p class="error">${escapeHtml((err as Error).message || 'Impossible de charger cette watch party.')}</p>`;
    return;
  }

@ -144,14 +144,14 @@ function wireActions(root: HTMLElement, staticId: string): void {
  joinBtn.addEventListener('click', () => {
    runBusy(joinBtn, async () => {
      await joinStaticParty(staticId);
-      showToast('Tu fais maintenant partie de cette lounge party.');
+      showToast('Tu fais maintenant partie de cette watch party.');
      await reload(root, staticId);
    });
  });

  const leaveBtn = root.querySelector('#leaveBtn') as HTMLButtonElement;
  leaveBtn.addEventListener('click', () => {
-    if (!confirm('Quitter cette lounge party ? Ta progression y sera oubliée.')) return;
+    if (!confirm('Quitter cette watch party ? Ta progression y sera oubliée.')) return;
    runBusy(leaveBtn, async () => {
      await leaveStaticParty(staticId);
      await reload(root, staticId);
@ -160,11 +160,11 @@ function wireActions(root: HTMLElement, staticId: string): void {

  const deleteBtn = root.querySelector('#deleteBtn') as HTMLButtonElement;
  deleteBtn.addEventListener('click', () => {
-    if (!confirm('Supprimer cette lounge party pour tout le monde ? La progression de chacun sera perdue.')) return;
+    if (!confirm('Supprimer cette watch party pour tout le monde ? La progression de chacun sera perdue.')) return;
    runBusy(deleteBtn, async () => {
      await deleteStaticParty(staticId);
-      showToast('Lounge party supprimée.');
-      navigate('/static');
+      showToast('Watch party supprimée.');
+      navigate('/home');
    });
  });

--- a/client/src/views/staticParty/createStaticButton.ts
+++ b/client/src/views/staticParty/createStaticButton.ts
@ -3,7 +3,7 @@ import { navigate } from '../../router';
 import { showToast } from '../../toast';

 /**
- * "Créer une lounge party" - shared by views/series and
+ * "Créer une watch party permanente" - shared by views/series and
 * views/playlist: creates a static watch party over `sourceId` (a series
 * or a video playlist - the server decides which, and refuses anything
 * else with a message) and opens its page.
--- a/docs/architecture.md
+++ b/docs/architecture.md
@ -4576,19 +4576,10 @@ short version:
  so the player, sync, shared stream, lobby and host handoff are all
  reused unchanged. `PartyService` calls into `StaticPartyService`,
  never the other way around.
- **This app's first on-disk state.** One JSON file per static party
-  (`StaticPartyStore`, `${DATA_DIR}/static-parties/<id>.json`). Writes
-  are atomic, debounced per party, and flushed on SIGTERM. It started
-  as a single file for every party; that was split, so a write only
-  touches the party that changed and a corrupt file costs only that
-  party. The old single file is migrated once, on first load. "Party
-  lifecycle" above still holds for ordinary parties.
- **Its own tab and its own name.** The UI calls these **Lounge
-  parties**, next to **Watch party** (classic video) and **Listen
-  party** (classic audio). The code keeps "static party". The "Lounge
-  parties" tab (`/static`) lists them. The home page's live "Parties en
-  cours" list (each card badged Watch/Listen party) leaves their
-  sessions out, so classic and lounge parties never share a list.
+- **This app's first on-disk state.** A JSON file
+  (`StaticPartyStore`, `DATA_DIR`) that is atomic, debounced, and
+  flushed on SIGTERM. "Party lifecycle" above still holds for ordinary
+  parties.
 - **"Completed" gained a second trigger.** `PartyService
  .completeCurrentItem` is now the one place an item counts as done. It
  handles Emby Played, as before, plus static progress. It runs from
--- a/server/src/index.ts
+++ b/server/src/index.ts
@ -258,7 +258,7 @@ app.get('/api/catalog/party-stream/:partyId/master.m3u8', allowCastCors, asyncRo
  if (!session) { res.status(401).end(); return; }
  const party = PartyService.getById(partyId);
  if (!party || !party.members.has(session.userId)) {
-    res.status(403).json({ error: "Tu n'es pas membre de cette party." });
+    res.status(403).json({ error: "Tu n'es pas membre de cette watch party." });
    return;
  }
  await PartyStreamService.serveMasterPlaylist(req, res, party, session);
@ -272,7 +272,7 @@ app.get('/api/catalog/party-stream/:partyId/raw', allowCastCors, asyncRoute(asyn
  if (!session) { res.status(401).end(); return; }
  const party = PartyService.getById(partyId);
  if (!party || !party.members.has(session.userId)) {
-    res.status(403).json({ error: "Tu n'es pas membre de cette party." });
+    res.status(403).json({ error: "Tu n'es pas membre de cette watch party." });
    return;
  }
  await PartyStreamService.serveRawAsset(req, res, party, session);
@ -302,7 +302,7 @@ app.get('/api/catalog/burn/:partyId/master.m3u8', allowCastCors, asyncRoute(asyn
  if (!session) { res.status(401).end(); return; }
  const party = PartyService.getById(partyId);
  if (!party || !party.members.has(session.userId)) {
-    res.status(403).json({ error: "Tu n'es pas membre de cette party." });
+    res.status(403).json({ error: "Tu n'es pas membre de cette watch party." });
    return;
  }
  if (!party.burnInSubtitleIndex) {
@ -318,7 +318,7 @@ app.get('/api/catalog/burn/:partyId/:segment', allowCastCors, asyncRoute(async (
  if (!session) { res.status(401).end(); return; }
  const party = PartyService.getById(partyId);
  if (!party || !party.members.has(session.userId)) {
-    res.status(403).json({ error: "Tu n'es pas membre de cette party." });
+    res.status(403).json({ error: "Tu n'es pas membre de cette watch party." });
    return;
  }
  await TranscodeService.serveSegment(req, res, party, param(req, 'segment'));
@ -556,12 +556,12 @@ function createMusicPartyFromTracks(res: Response, session: EmbySession, tracks:
 app.post('/api/parties/:partyId/tracks', requireSession, (req, res) => {
  const party = PartyService.getById(param(req, 'partyId'));
  if (!party || party.mediaType !== 'music') {
-    res.status(404).json({ error: 'Listen party introuvable.' });
+    res.status(404).json({ error: 'Watch party musique introuvable.' });
    return;
  }
  const session = req.embySession!;
  if (!party.members.has(session.userId)) {
-    res.status(403).json({ error: "Tu n'es pas membre de cette party." });
+    res.status(403).json({ error: "Tu n'es pas membre de cette watch party." });
    return;
  }
  const track = req.body || {};
@ -587,12 +587,12 @@ app.post('/api/parties/:partyId/tracks', requireSession, (req, res) => {
 app.post('/api/parties/:partyId/queue', requireSession, asyncRoute(async (req, res) => {
  const party = PartyService.getById(param(req, 'partyId'));
  if (!party || party.mediaType !== 'music') {
-    res.status(404).json({ error: 'Listen party introuvable.' });
+    res.status(404).json({ error: 'Watch party musique introuvable.' });
    return;
  }
  const session = req.embySession!;
  if (!party.members.has(session.userId)) {
-    res.status(403).json({ error: "Tu n'es pas membre de cette party." });
+    res.status(403).json({ error: "Tu n'es pas membre de cette watch party." });
    return;
  }
  const itemId = req.body?.itemId;
@ -662,7 +662,7 @@ app.post('/api/parties/:partyId/cast-token', requireSession, (req, res) => {
  const party = PartyService.getById(param(req, 'partyId'));
  const session = req.embySession!;
  if (!party || !party.members.has(session.userId)) {
-    res.status(403).json({ error: "Tu n'es pas membre de cette party." });
+    res.status(403).json({ error: "Tu n'es pas membre de cette watch party." });
    return;
  }
  res.json({ token: CastTokenService.issue(party.id, session) });
@ -721,7 +721,7 @@ function liveGroupPartyId(sp: StaticParty): string | null {
 /** Finds `:staticId` or answers 404 - null means the response is sent. */
 function staticPartyOr404(req: Request, res: Response): StaticParty | null {
  const sp = StaticPartyService.getById(param(req, 'staticId'));
-  if (!sp) res.status(404).json({ error: 'Lounge party introuvable.' });
+  if (!sp) res.status(404).json({ error: 'Watch party permanente introuvable.' });
  return sp;
 }

@ -755,7 +755,7 @@ app.post('/api/static-parties', requireSession, asyncRoute(async (req, res) => {
  } else if (item.Type === 'Playlist') {
    source = { type: 'playlist', sourceId: item.Id };
  } else {
-    res.status(400).json({ error: 'Une lounge party se crée depuis une série ou une playlist vidéo.' });
+    res.status(400).json({ error: 'Une watch party permanente se crée depuis une série ou une playlist vidéo.' });
    return;
  }

@ -800,7 +800,7 @@ app.delete('/api/static-parties/:staticId', requireSession, (req, res) => {
  const sp = staticPartyOr404(req, res);
  if (!sp) return;
  if (!StaticPartyService.delete(sp, req.embySession!.userId)) {
-    res.status(403).json({ error: 'Seule la personne qui a créé cette lounge party peut la supprimer.' });
+    res.status(403).json({ error: 'Seule la personne qui a créé cette watch party peut la supprimer.' });
    return;
  }
  res.json({ ok: true });
@ -811,7 +811,7 @@ app.post('/api/static-parties/:staticId/items/:itemId/watched', requireSession,
  if (!sp) return;
  const session = req.embySession!;
  if (!StaticPartyService.markWatched(sp, { userId: session.userId, userName: session.userName }, param(req, 'itemId'))) {
-    res.status(404).json({ error: 'Cet élément ne fait pas partie de cette lounge party.' });
+    res.status(404).json({ error: 'Cet élément ne fait pas partie de cette watch party.' });
    return;
  }
  res.json({ ok: true });
@ -844,7 +844,7 @@ app.post('/api/static-parties/:staticId/session', requireSession, asyncRoute(asy

  const queue = StaticPartyService.groupQueue(sp);
  if (!queue.length) {
-    res.status(409).json({ error: 'Le groupe a déjà tout vu dans cette lounge party.' });
+    res.status(409).json({ error: 'Le groupe a déjà tout vu dans cette watch party.' });
    return;
  }
  const first = queue[0]!;
--- a/server/src/services/StaticPartyService.ts
+++ b/server/src/services/StaticPartyService.ts
@ -70,8 +70,7 @@ export function mergeItemLists(existing: QueueItem[], fresh: QueueItem[]): { ite
 * PartyService (PartyService calls into this one), keeping the dependency
 * one-way.
 *
- * Persisted through StaticPartyStore after every change - one file per
- * party, so only the party that changed is ever rewritten.
+ * Persisted through StaticPartyStore after every change.
 */
 class StaticPartyServiceClass {
  /** Every static party, by id. */
@ -119,7 +118,7 @@ class StaticPartyServiceClass {
    sp.members[creator.userId] = this.newMember(creator);
    this.partiesById.set(sp.id, sp);
    Logger.staticParty(`created id=${sp.id} name="${name}" source=${source.type}:${source.sourceId} items=${items.length} by=${Logger.who(creator.userId, creator.userName)}`);
-    this.persist(sp);
+    this.persist();
    return sp;
  }

@ -129,13 +128,13 @@ class StaticPartyServiceClass {
    if (existing) {
      existing.userName = who.userName;
      existing.lastSeenUtc = Date.now();
-      this.persist(sp);
+      this.persist();
      return existing;
    }
    const member = this.newMember(who);
    sp.members[who.userId] = member;
    Logger.staticParty(`joined id=${sp.id} user=${Logger.who(who.userId, who.userName)} members=${Object.keys(sp.members).length}`);
-    this.persist(sp);
+    this.persist();
    return member;
  }

@ -146,7 +145,7 @@ class StaticPartyServiceClass {
    if (!member) return;
    delete sp.members[userId];
    Logger.staticParty(`left id=${sp.id} user=${Logger.who(userId, member.userName)} members=${Object.keys(sp.members).length}`);
-    this.persist(sp);
+    this.persist();
  }

  /** Deletes the party for good - creator only. Returns false (and does
@ -158,7 +157,7 @@ class StaticPartyServiceClass {
    }
    this.partiesById.delete(sp.id);
    Logger.staticParty(`deleted id=${sp.id} name="${sp.name}"`);
-    StaticPartyStore.remove(sp.id);
+    this.persist();
    return true;
  }

@ -170,7 +169,7 @@ class StaticPartyServiceClass {
    const changed = added > 0 || items.some((item, i) => item !== sp.items[i]);
    sp.items = items;
    if (added) Logger.staticParty(`refreshed id=${sp.id} +${added} new item(s), total=${items.length}`);
-    if (changed) this.persist(sp);
+    if (changed) this.persist();
  }

  /** What the group's next session plays: everything from the group's
@ -185,7 +184,7 @@ class StaticPartyServiceClass {
    if (partyId) {
      sp.group.lastSessionUtc = Date.now();
      Logger.staticParty(`session started id=${sp.id} partyId=${partyId} at item ${sp.group.nextIndex + 1}/${sp.items.length}`);
-      this.persist(sp);
+      this.persist();
    }
  }

@ -212,7 +211,7 @@ class StaticPartyServiceClass {
      sp.group.resumePositionTicks = 0;
    }
    Logger.staticParty(`item completed id=${sp.id} mode=${link.mode} item=${itemId} by=[${connected.map((c) => c.userName).join(', ')}] group=${sp.group.completedItemIds.length}/${sp.items.length}`);
-    this.persist(sp);
+    this.persist();
  }

  /** The group session's current position - saved so the next session
@ -223,7 +222,7 @@ class StaticPartyServiceClass {
    if (!sp || sp.items[sp.group.nextIndex]?.itemId !== itemId) return;
    if (sp.group.resumePositionTicks === positionTicks) return;
    sp.group.resumePositionTicks = positionTicks;
-    this.persist(sp);
+    this.persist();
  }

  /** A linked live party ended - forget it as the group's live session. */
@ -232,7 +231,7 @@ class StaticPartyServiceClass {
    if (!sp || sp.livePartyId !== partyId) return;
    sp.livePartyId = null;
    Logger.staticParty(`session ended id=${sp.id} partyId=${partyId} resumeAt=item ${sp.group.nextIndex + 1} ${Math.round(sp.group.resumePositionTicks / 10000000)}s`);
-    this.persist(sp);
+    this.persist();
  }

  /** "Marquer comme vu" - `who` becomes a member if they weren't yet. */
@ -242,7 +241,7 @@ class StaticPartyServiceClass {
    if (!member.watchedItemIds.includes(itemId)) member.watchedItemIds.push(itemId);
    member.lastSeenUtc = Date.now();
    Logger.staticParty(`marked watched id=${sp.id} user=${Logger.who(who.userId, who.userName)} item=${itemId}`);
-    this.persist(sp);
+    this.persist();
    return true;
  }

@ -292,16 +291,14 @@ class StaticPartyServiceClass {
    };
  }

-  /** Writes `sp`'s own file (debounced - see StaticPartyStore). Only the
-   *  party that changed is ever rewritten. */
-  private persist(sp: StaticParty): void {
-    StaticPartyStore.save(sp.id, () => this.snapshotOf(sp));
+  /** Writes every party to disk (debounced - see StaticPartyStore). */
+  private persist(): void {
+    StaticPartyStore.save(() => this.snapshot());
  }

-  /** `sp` minus runtime-only state. */
-  private snapshotOf(sp: StaticParty): PersistedStaticParty {
-    const { livePartyId: _live, ...persisted } = sp;
-    return persisted;
+  /** Every party, minus runtime-only state. */
+  private snapshot(): PersistedStaticParty[] {
+    return Array.from(this.partiesById.values()).map(({ livePartyId: _live, ...persisted }) => persisted);
  }

  /** When `sp` last saw anything happen - for list ordering. */
--- a/server/src/services/StaticPartyStore.ts
+++ b/server/src/services/StaticPartyStore.ts
@ -5,182 +5,121 @@ import path from 'path';
 import { Logger } from '../Logger';
 import type { PersistedStaticParty } from '../types';

-/** One party's own file - versioned so a future format change can migrate
- *  instead of silently misreading an older file. */
+/** The on-disk file's own shape - versioned so a future format change can
+ *  migrate instead of silently misreading an older file. */
 interface StaticPartyFile {
-  version: 1;
-  party: PersistedStaticParty;
-}
-
-/** The first release's single-file format - only read once, to migrate. */
-interface LegacyStaticPartiesFile {
  version: 1;
  parties: PersistedStaticParty[];
 }

-/** How long a save waits for more changes to the same party before
- *  writing - progress updates arrive in bursts (a whole party's members
- *  at once, the 20s position sweep). */
+/** How long a save waits for more changes before writing - progress
+ *  updates arrive in bursts (a whole party's members at once, the 20s
+ *  position sweep), no reason to rewrite the file for each one. */
 const SAVE_DEBOUNCE_MS = 2000;

-/** Party ids become file names - anything else is refused outright, so a
- *  crafted id can never reach outside the directory. */
-const SAFE_ID = /^[A-Za-z0-9-]+$/;
-
 /**
- * The static watch parties' persistence: **one JSON file per party**,
- * `${DATA_DIR}/static-parties/<id>.json` - the first and only thing this
- * app keeps on disk (everything else is deliberately in-memory - see
- * docs/architecture.md's "Party lifecycle").
+ * The static watch parties' persistence - one JSON file, the first and
+ * only thing this app keeps on disk (everything else is deliberately
+ * in-memory - see docs/architecture.md's "Party lifecycle"). A JSON file
+ * rather than a database: the data is tiny (a handful of parties, a few
+ * hundred item ids each), the runtime image is Node 20 (no built-in
+ * `node:sqlite`), and a native SQLite binding would be the image's first
+ * compiled dependency - not worth it at this size.
 *
- * One file per party (rather than a single file for all of them) limits
- * what any one problem can damage: a write only ever touches the party
- * that changed, and a corrupt file costs that one party, never the rest.
- * Each write is also atomic (a `.tmp` sibling, then a rename over the
- * real file), so a crash mid-write leaves the previous version intact.
- *
- * Writes are debounced per party (SAVE_DEBOUNCE_MS). A corrupt file is
- * logged and moved aside (`.corrupt`) rather than overwritten or
- * silently dropped - the server must never refuse to start over one, and
- * nothing is lost for good. The first release's single
- * `static-parties.json` is migrated once, on the first load that finds it.
- *
- * JSON files rather than a database: the data is tiny, the runtime image
- * is Node 20 (no built-in `node:sqlite`), and a native SQLite binding would
- * be the image's first compiled dependency - not worth it at this size.
+ * Writes are atomic (write a `.tmp` sibling, then rename over the real
+ * file) so a crash mid-write never leaves a half-written file behind, and
+ * debounced (SAVE_DEBOUNCE_MS). A missing file is a normal first start; an
+ * unreadable/corrupt one is logged and treated as empty - the server must
+ * never refuse to start over it. The corrupt file is kept aside (`.corrupt`)
+ * rather than overwritten by the next save, so nothing is lost for good.
 */
 class StaticPartyStoreClass {
-  /** `${DATA_DIR}/static-parties` - see configure(). */
-  private dir: string | null = null;
-  /** The first release's single file, migrated on load if still present. */
-  private legacyFile: string | null = null;
-  /** Pending debounced saves, by party id. */
-  private timers = new Map<string, NodeJS.Timeout>();
-  /** What each pending save will write - always the latest snapshot. */
-  private pending = new Map<string, () => PersistedStaticParty>();
+  /** Absolute path of the JSON file - see configure(). */
+  private filePath: string | null = null;
+  /** The pending debounced save, if any. */
+  private saveTimer: NodeJS.Timeout | null = null;
+  /** What the pending save will write - always the latest snapshot. */
+  private pending: (() => PersistedStaticParty[]) | null = null;

-  /** Points the store at `dataDir`. Must be called before anything else -
-   *  index.ts does it at startup, tests with a temp directory. */
+  /** Points the store at `dataDir/static-parties.json`. Must be called
+   *  before load()/save() - index.ts does it at startup, tests with a
+   *  temp directory. */
  public configure(dataDir: string): void {
-    this.dir = path.resolve(dataDir, 'static-parties');
-    this.legacyFile = path.resolve(dataDir, 'static-parties.json');
+    this.filePath = path.resolve(dataDir, 'static-parties.json');
  }

  /** Reads every persisted party - synchronous, startup-only. */
  public load(): PersistedStaticParty[] {
-    const dir = this.requireDir();
+    const file = this.requirePath();
+    let raw: string;
    try {
-      fs.mkdirSync(dir, { recursive: true });
+      raw = fs.readFileSync(file, 'utf8');
    } catch (err) {
-      Logger.staticParty(`could not create ${dir} - starting empty: ${(err as Error).message}`);
+      if ((err as NodeJS.ErrnoException).code === 'ENOENT') {
+        Logger.staticParty(`no data file yet at ${file} - starting empty`);
+      } else {
+        Logger.staticParty(`could not read ${file} - starting empty: ${(err as Error).message}`);
+      }
      return [];
    }
-    this.migrateLegacyFile();
-
-    let names: string[];
    try {
-      names = fs.readdirSync(dir);
+      const parsed = JSON.parse(raw) as Partial<StaticPartyFile>;
+      if (!parsed || !Array.isArray(parsed.parties)) throw new Error('missing "parties" array');
+      Logger.staticParty(`loaded ${parsed.parties.length} static party(ies) from ${file}`);
+      return parsed.parties;
    } catch (err) {
-      Logger.staticParty(`could not list ${dir} - starting empty: ${(err as Error).message}`);
+      Logger.staticParty(`corrupt data file ${file} - moved aside to .corrupt, starting empty: ${(err as Error).message}`);
+      try {
+        fs.renameSync(file, `${file}.corrupt`);
+      } catch (renameErr) {
+        Logger.staticParty(`could not move corrupt file aside: ${(renameErr as Error).message}`);
+      }
      return [];
    }
-
-    const parties: PersistedStaticParty[] = [];
-    for (const name of names) {
-      const file = path.join(dir, name);
-      if (name.endsWith('.tmp')) {
-        // A write interrupted before its rename - the real file next to it
-        // (if any) is still the last complete version.
-        this.tryUnlink(file);
-        continue;
-      }
-      if (!name.endsWith('.json')) continue; // .corrupt files and anything else
-      const party = this.readPartyFile(file);
-      if (party) parties.push(party);
-    }
-    Logger.staticParty(`loaded ${parties.length} static party(ies) from ${dir}`);
-    return parties;
  }

-  /** Schedules a debounced write of `id`'s own file, from whatever
-   *  `snapshot` returns at write time (so a burst of changes only ever
-   *  writes the final state). */
-  public save(id: string, snapshot: () => PersistedStaticParty): void {
-    if (!SAFE_ID.test(id)) {
-      Logger.staticParty(`save refused: unsafe id "${id}"`);
-      return;
-    }
-    this.pending.set(id, snapshot);
-    if (this.timers.has(id)) return;
-    const timer = setTimeout(() => {
-      this.timers.delete(id);
-      this.writeOne(id).catch((err: unknown) => {
-        Logger.staticParty(`save failed id=${id}: ${(err as Error).message}`);
+  /** Schedules a debounced write of whatever `snapshot` returns at write
+   *  time (so a burst of changes only ever writes the final state). */
+  public save(snapshot: () => PersistedStaticParty[]): void {
+    this.pending = snapshot;
+    if (this.saveTimer) return;
+    this.saveTimer = setTimeout(() => {
+      this.saveTimer = null;
+      this.writeNow().catch((err: unknown) => {
+        Logger.staticParty(`save failed: ${(err as Error).message}`);
      });
    }, SAVE_DEBOUNCE_MS);
-    timer.unref(); // a pending save must never keep a test process (or a shutdown) alive
-    this.timers.set(id, timer);
+    this.saveTimer.unref(); // a pending save must never keep a test process (or a shutdown) alive
  }

-  /** Deletes `id`'s file - and cancels any save still pending for it, so
-   *  a debounced write can't recreate a party that was just deleted. */
-  public remove(id: string): void {
-    const timer = this.timers.get(id);
-    if (timer) clearTimeout(timer);
-    this.timers.delete(id);
-    this.pending.delete(id);
-    if (!SAFE_ID.test(id)) return;
-    const file = this.fileFor(id);
-    try {
-      fs.unlinkSync(file);
-      Logger.staticParty(`removed ${file}`);
-    } catch (err) {
-      if ((err as NodeJS.ErrnoException).code !== 'ENOENT') {
-        Logger.staticParty(`could not remove ${file}: ${(err as Error).message}`);
-      }
-    }
-  }
-
-  /** Writes every pending save immediately and synchronously - for a
-   *  graceful shutdown (SIGTERM/SIGINT), where an async write could be cut
-   *  short by the process exiting. */
+  /** Writes any pending save immediately and synchronously - for a
+   *  graceful shutdown (SIGTERM/SIGINT), where an async write could be
+   *  cut short by the process exiting. */
  public flushSync(): void {
-    for (const timer of this.timers.values()) clearTimeout(timer);
-    this.timers.clear();
-    const pending = Array.from(this.pending.entries());
-    this.pending.clear();
-    for (const [id, snapshot] of pending) {
-      const file = this.fileFor(id);
+    if (this.saveTimer) {
+      clearTimeout(this.saveTimer);
+      this.saveTimer = null;
+    }
+    if (!this.pending) return;
+    const file = this.requirePath();
+    const snapshot = this.pending;
+    this.pending = null;
    try {
      fs.mkdirSync(path.dirname(file), { recursive: true });
      fs.writeFileSync(`${file}.tmp`, this.serialize(snapshot()), 'utf8');
      fs.renameSync(`${file}.tmp`, file);
+      Logger.staticParty(`flushed to ${file}`);
    } catch (err) {
-        Logger.staticParty(`flush failed id=${id}: ${(err as Error).message}`);
+      Logger.staticParty(`flush failed: ${(err as Error).message}`);
    }
  }
-    if (pending.length) Logger.staticParty(`flushed ${pending.length} static party(ies)`);
-  }

-  /** Writes every pending save now (async) - lets tests wait for disk. */
+  /** Writes the pending snapshot now - atomically, via a `.tmp` rename. */
  public async writeNow(): Promise<void> {
-    for (const timer of this.timers.values()) clearTimeout(timer);
-    this.timers.clear();
-    const ids = Array.from(this.pending.keys());
-    try {
-      await Promise.all(ids.map((id) => this.writeOne(id)));
-    } catch (err) {
-      Logger.staticParty(`writeNow failed: ${(err as Error).message}`);
-      throw err;
-    }
-  }
-
-  /** Writes `id`'s pending snapshot - atomically, via a `.tmp` rename. */
-  private async writeOne(id: string): Promise<void> {
-    const snapshot = this.pending.get(id);
-    if (!snapshot) return;
-    this.pending.delete(id);
-    const file = this.fileFor(id);
+    if (!this.pending) return;
+    const file = this.requirePath();
+    const snapshot = this.pending;
+    this.pending = null;
    try {
      await fs.promises.mkdir(path.dirname(file), { recursive: true });
      await fs.promises.writeFile(`${file}.tmp`, this.serialize(snapshot()), 'utf8');
@ -191,81 +130,16 @@ class StaticPartyStoreClass {
    }
  }

-  /** One party file's content, or null (moved aside) if it's unreadable. */
-  private readPartyFile(file: string): PersistedStaticParty | null {
-    try {
-      const parsed = JSON.parse(fs.readFileSync(file, 'utf8')) as Partial<StaticPartyFile>;
-      const party = parsed?.party;
-      if (!party || typeof party.id !== 'string' || !Array.isArray(party.items)) {
-        throw new Error('missing or malformed "party"');
-      }
-      if (path.basename(file) !== `${party.id}.json`) throw new Error(`file name does not match id ${party.id}`);
-      return party;
-    } catch (err) {
-      Logger.staticParty(`corrupt file ${file} - moved aside to .corrupt, skipped: ${(err as Error).message}`);
-      try {
-        fs.renameSync(file, `${file}.corrupt`);
-      } catch (renameErr) {
-        Logger.staticParty(`could not move corrupt file aside: ${(renameErr as Error).message}`);
-      }
-      return null;
-    }
-  }
-
-  /**
-   * The first release kept every party in one `static-parties.json` -
-   * split it into one file per party, then rename it to `.migrated` (kept,
-   * not deleted, in case anything went wrong). A party that already has
-   * its own file is left alone: that file is newer.
-   */
-  private migrateLegacyFile(): void {
-    const legacy = this.legacyFile!;
-    if (!fs.existsSync(legacy)) return;
-    try {
-      const parsed = JSON.parse(fs.readFileSync(legacy, 'utf8')) as Partial<LegacyStaticPartiesFile>;
-      const parties = Array.isArray(parsed?.parties) ? parsed.parties : [];
-      let migrated = 0;
-      for (const party of parties) {
-        if (!party || typeof party.id !== 'string' || !SAFE_ID.test(party.id)) continue;
-        const file = this.fileFor(party.id);
-        if (fs.existsSync(file)) continue;
-        fs.writeFileSync(`${file}.tmp`, this.serialize(party), 'utf8');
-        fs.renameSync(`${file}.tmp`, file);
-        migrated++;
-      }
-      fs.renameSync(legacy, `${legacy}.migrated`);
-      Logger.staticParty(`migrated ${migrated} static party(ies) from ${legacy} to one file each (original kept as .migrated)`);
-    } catch (err) {
-      Logger.staticParty(`could not migrate ${legacy} - left in place: ${(err as Error).message}`);
-    }
-  }
-
-  /** `id`'s own file path. */
-  private fileFor(id: string): string {
-    return path.join(this.requireDir(), `${id}.json`);
-  }
-
-  /** A party file's JSON text. */
-  private serialize(party: PersistedStaticParty): string {
-    const data: StaticPartyFile = { version: 1, party };
+  /** The file's JSON text for `parties`. */
+  private serialize(parties: PersistedStaticParty[]): string {
+    const data: StaticPartyFile = { version: 1, parties };
    return JSON.stringify(data, null, 2);
  }

-  /** Best-effort delete - logs anything but "already gone". */
-  private tryUnlink(file: string): void {
-    try {
-      fs.unlinkSync(file);
-    } catch (err) {
-      if ((err as NodeJS.ErrnoException).code !== 'ENOENT') {
-        Logger.staticParty(`could not remove ${file}: ${(err as Error).message}`);
-      }
-    }
-  }
-
-  /** The configured directory - throws if configure() was never called. */
-  private requireDir(): string {
-    if (!this.dir) throw new Error('StaticPartyStore.configure() was never called');
-    return this.dir;
+  /** The configured file path - throws if configure() was never called. */
+  private requirePath(): string {
+    if (!this.filePath) throw new Error('StaticPartyStore.configure() was never called');
+    return this.filePath;
  }
 }

--- a/server/test/staticPartyService.test.ts
+++ b/server/test/staticPartyService.test.ts
@ -22,12 +22,10 @@ before(() => {
  StaticPartyStore.configure(dataDir);
 });

-const partiesDir = () => path.join(dataDir, 'static-parties');
-
 beforeEach(() => {
  StaticPartyStore.flushSync(); // no debounced save from a previous test may land mid-test
-  fs.rmSync(partiesDir(), { recursive: true, force: true });
-  for (const name of fs.readdirSync(dataDir)) fs.rmSync(path.join(dataDir, name), { recursive: true, force: true });
+  fs.rmSync(path.join(dataDir, 'static-parties.json'), { force: true });
+  fs.rmSync(path.join(dataDir, 'static-parties.json.corrupt'), { force: true });
  StaticPartyService.init();
 });

@ -168,90 +166,31 @@ describe('StaticPartyService', () => {
 });

 describe('StaticPartyStore', () => {
-  it('writes one file per party, and round-trips it without runtime-only state', async () => {
+  it('round-trips every party through the JSON file, without runtime-only state', async () => {
    const sp = StaticPartyService.create(alice, { type: 'playlist', sourceId: 'pl1' }, 'Soirées', '/img/pl1', ITEMS);
-    const other = StaticPartyService.create(bob, { type: 'series', sourceId: 's1' }, 'My Show', '/img/s1', ITEMS);
    StaticPartyService.onItemCompleted({ staticPartyId: sp.id, mode: 'group' }, 'e1', [alice]);
    StaticPartyService.setLiveParty(sp, 'live-1');
    await StaticPartyStore.writeNow();

-    assert.deepEqual(fs.readdirSync(partiesDir()).sort(), [`${sp.id}.json`, `${other.id}.json`].sort());
-    const onDisk = JSON.parse(fs.readFileSync(path.join(partiesDir(), `${sp.id}.json`), 'utf8'));
+    const onDisk = JSON.parse(fs.readFileSync(path.join(dataDir, 'static-parties.json'), 'utf8'));
    assert.equal(onDisk.version, 1);
-    assert.equal('livePartyId' in onDisk.party, false);
+    assert.equal('livePartyId' in onDisk.parties[0], false);

    StaticPartyService.init();
    const reloaded = StaticPartyService.getById(sp.id)!;
    assert.equal(reloaded.name, 'Soirées');
    assert.deepEqual(reloaded.group.completedItemIds, ['e1']);
    assert.equal(reloaded.livePartyId, null, 'a restart ends every live session');
-    assert.ok(StaticPartyService.getById(other.id));
  });

-  it('a change only rewrites the party that changed', async () => {
-    const sp = StaticPartyService.create(alice, { type: 'series', sourceId: 's1' }, 'A', '/img/s1', ITEMS);
-    const other = StaticPartyService.create(bob, { type: 'series', sourceId: 's1' }, 'B', '/img/s1', ITEMS);
-    await StaticPartyStore.writeNow();
-    const otherFile = path.join(partiesDir(), `${other.id}.json`);
-    const past = new Date(Date.now() - 60000);
-    fs.utimesSync(otherFile, past, past);
-
-    StaticPartyService.markWatched(sp, alice, 'e1');
-    await StaticPartyStore.writeNow();
-
-    assert.equal(fs.statSync(otherFile).mtimeMs, past.getTime(), 'the untouched party\'s file was not rewritten');
-  });
-
-  it('deleting a party removes its file, even with a save still pending', async () => {
-    const sp = StaticPartyService.create(alice, { type: 'series', sourceId: 's1' }, 'A', '/img/s1', ITEMS);
-    await StaticPartyStore.writeNow();
-    StaticPartyService.markWatched(sp, alice, 'e1'); // schedules a save...
-    StaticPartyService.delete(sp, alice.userId); // ...that must not recreate the file
-    await StaticPartyStore.writeNow();
-    assert.equal(fs.existsSync(path.join(partiesDir(), `${sp.id}.json`)), false);
-  });
-
-  it('a corrupt file is moved aside and only that party is lost', async () => {
-    const good = StaticPartyService.create(alice, { type: 'series', sourceId: 's1' }, 'Good', '/img/s1', ITEMS);
-    await StaticPartyStore.writeNow();
-    fs.writeFileSync(path.join(partiesDir(), 'broken-id.json'), '{ not json', 'utf8');
-
+  it('a corrupt file is moved aside and the service starts empty instead of crashing', () => {
+    fs.writeFileSync(path.join(dataDir, 'static-parties.json'), '{ not json', 'utf8');
    StaticPartyService.init();
-
-    assert.deepEqual(StaticPartyService.list().map((p) => p.id), [good.id]);
-    assert.ok(fs.existsSync(path.join(partiesDir(), 'broken-id.json.corrupt')));
+    assert.equal(StaticPartyService.list().length, 0);
+    assert.ok(fs.existsSync(path.join(dataDir, 'static-parties.json.corrupt')));
  });

-  it('a leftover .tmp from an interrupted write is cleaned up, the real file kept', async () => {
-    const sp = StaticPartyService.create(alice, { type: 'series', sourceId: 's1' }, 'A', '/img/s1', ITEMS);
-    await StaticPartyStore.writeNow();
-    fs.writeFileSync(path.join(partiesDir(), `${sp.id}.json.tmp`), '{ half-writ', 'utf8');
-
-    StaticPartyService.init();
-
-    assert.ok(StaticPartyService.getById(sp.id));
-    assert.equal(fs.existsSync(path.join(partiesDir(), `${sp.id}.json.tmp`)), false);
-  });
-
-  it('migrates the first release\'s single static-parties.json into one file per party', () => {
-    const legacy = { version: 1, parties: [
-      { id: 'aaa-1', name: 'One', source: { type: 'series', sourceId: 's1' }, imageUrl: '', createdByUserId: 'u-alice', createdUtc: 1,
-        items: ITEMS, group: { nextIndex: 1, resumePositionTicks: 0, completedItemIds: ['e1'], lastSessionUtc: null }, members: {} },
-      { id: 'bbb-2', name: 'Two', source: { type: 'series', sourceId: 's1' }, imageUrl: '', createdByUserId: 'u-bob', createdUtc: 2,
-        items: ITEMS, group: { nextIndex: 0, resumePositionTicks: 0, completedItemIds: [], lastSessionUtc: null }, members: {} }
-    ] };
-    fs.writeFileSync(path.join(dataDir, 'static-parties.json'), JSON.stringify(legacy), 'utf8');
-
-    StaticPartyService.init();
-
-    assert.deepEqual(StaticPartyService.list().map((p) => p.id).sort(), ['aaa-1', 'bbb-2']);
-    assert.deepEqual(StaticPartyService.getById('aaa-1')!.group.completedItemIds, ['e1']);
-    assert.ok(fs.existsSync(path.join(partiesDir(), 'aaa-1.json')));
-    assert.equal(fs.existsSync(path.join(dataDir, 'static-parties.json')), false);
-    assert.ok(fs.existsSync(path.join(dataDir, 'static-parties.json.migrated')), 'the original is kept, not deleted');
-  });
-
-  it('an empty data directory is a normal first start', () => {
+  it('a missing file is a normal first start', () => {
    StaticPartyService.init();
    assert.equal(StaticPartyService.list().length, 0);
  });
--- a/spec/static-watch-party.md
+++ b/spec/static-watch-party.md
@ -1,16 +1,4 @@
-# Lounge party (watch party statique)
-
-## Les trois types de party
-
-| Nom dans l'interface | Quoi | Où |
-|---|---|---|
-| **Watch party** | party vidéo classique, éphémère | accueil, « Parties en cours » |
-| **Listen party** | party audio classique, éphémère (barre musique) | accueil, « Parties en cours » |
-| **Lounge party** | party statique : une série ou une playlist vidéo suivie sur plusieurs séances | onglet « Lounge parties » |
-
-Côté code, la lounge party reste nommée « static party » (`StaticPartyService`,
-route `/static`, `staticLink`...). Seuls les libellés visibles ont changé. Sur
-l'accueil, chaque carte affiche un badge « Watch party » ou « Listen party ».
+# Watch party statique (permanente)

 ## Objectif

@ -97,24 +85,14 @@ des watch parties en cours.

 ## Persistance

- `StaticPartyStore` écrit **un fichier JSON par watch party** :
-  `${DATA_DIR}/static-parties/<id>.json`, au format `{version: 1, party}`.
+- `StaticPartyStore` écrit un fichier JSON unique :
+  `${DATA_DIR}/static-parties.json`.
  - `DATA_DIR` vaut `./data` par défaut, et `/data` dans l'image Docker.
    `docker-compose.yml` y monte `./data`.
-  - Un fichier par party limite les dégâts : une écriture ne touche que la
-    party modifiée, et un fichier corrompu ne coûte que cette party-là.
-  - L'écriture est atomique (`.tmp` puis `rename`) et debouncée (2 s) party
-    par party. Elle est flushée de façon synchrone sur `SIGTERM`/`SIGINT`.
-  - Au démarrage, un `.tmp` restant (écriture interrompue) est supprimé ; le
-    vrai fichier, s'il existe, est la dernière version complète.
-  - Un fichier corrompu (ou dont le nom ne correspond pas à l'id) est
-    renommé en `.corrupt` et ignoré ; les autres parties se chargent
-    normalement. Le serveur ne crashe jamais pour ça.
-  - Supprimer une party supprime son fichier et annule toute sauvegarde en
-    attente pour elle.
-  - Migration : l'ancien fichier unique `${DATA_DIR}/static-parties.json` de
-    la première version est éclaté en un fichier par party au premier
-    démarrage, puis renommé en `.migrated` (conservé, pas supprimé).
+  - L'écriture est atomique (`.tmp` puis `rename`) et debouncée (2 s).
+    Elle est flushée de façon synchrone sur `SIGTERM`/`SIGINT`.
+  - Un fichier corrompu est renommé en `.corrupt` et le serveur démarre à
+    vide ; il ne crashe jamais pour ça.
 - Pas de SQLite : l'image tourne en Node 20 (pas de `node:sqlite`), une
  dépendance native serait une première dans l'image, et les données sont
  minuscules.
@ -131,15 +109,13 @@ des watch parties en cours.
    solo, ou lancer une watch party de rattrapage ;
  - les membres ;
  - la liste complète des items.
- Bouton « Créer une lounge party » sur `views/series` et sur
+- Bouton « Créer une watch party permanente » sur `views/series` et sur
  `views/playlist` (vidéo uniquement).
- Onglet dédié « Lounge parties » (sidebar et menu mobile), route
-  `/static` (`views/staticParties/`) : une carte par watch party avec la
-  progression, le prochain élément, un badge « N manqués » et une pastille
-  « séance en cours ». L'onglet reste actif sur la page d'une party.
- Séparation avec les watch/listen parties classiques : la liste « Parties
-  en cours » de l'accueil exclut les séances de lounge party
-  (`staticPartyId` non nul) ; elles ne s'affichent que dans leur onglet.
+- Accueil :
+  - une section « Watch parties permanentes », avec la progression, un badge
+    « N manqués » et une pastille « séance en cours » ;
+  - les séances live affichent un lien `↻ nom` vers leur watch party
+    statique.

 ## Limites connues