README.md

@@ -351,6 +351,9 @@ Then put it behind your existing reverse proxy like everything else
 - [x] Installable as a PWA (manifest + icons, standalone display,
       no service worker — this app has nothing worth caching offline)
       — see docs/architecture.md
+- [x] Mobile navigation redesigned as a bottom sheet (Accueil /
+      Bibliothèques / Listes de lecture) instead of a horizontally
+      scrolling sidebar — see docs/architecture.md
 - [ ] Try a full party end-to-end with two real accounts (still the main gap)
 - [ ] Try casting to a real Chromecast (only the SDK's own bootstrap is
       confirmed here — no real device/session)

client/src/musicBar/MusicBar.css

@@ -6,13 +6,13 @@
    able to browse/add tracks while it plays). Sits above .mainContent, at
    a lower z-index than .playerWrap (20) so a video party's takeover still
    correctly covers it - moot in practice since joining a video party
-   calls leaveMusicParty() first (see Player.ts), but cheap to get right. */
+   calls leaveMusicParty() first (see Player.ts), but cheap to get right.
+   The fixed-to-viewport positioning itself lives one level up, on
+   Shell.css's .bottomStack wrapper - not here - so that on a narrow
+   screen the mobile nav trigger right below it in that wrapper always
+   sits flush above this bar's own actual rendered height (its content
+   can wrap taller on a narrow screen), never a hardcoded guess at it. */
 .musicBar {
-  position: fixed;
-  left: 0;
-  right: 0;
-  bottom: 0;
-  z-index: 15;
   background: var(--bg-header);
   border-top: 1px solid rgba(255, 255, 255, .08);
   box-shadow: 0 -4px 16px rgba(0, 0, 0, .3);

client/src/shell/Shell.css

@@ -62,20 +62,162 @@
   padding: 24px clamp(16px, 3vw, 48px) 80px;
 }
 
-/* Sidebar becomes a horizontal scrollable topbar on narrow screens. */
+/* ==== Mobile navigation (<=720px) ====
+   Replaces the sidebar outright - see docs/architecture.md's "Mobile
+   navigation" section for why a bottom sheet was chosen over reshaping
+   the sidebar into a horizontal bar. Every rule below the base
+   `display: none` only ever applies once the 720px media query turns
+   it back on, so none of this affects desktop. */
+.mobileTopBar,
+.mobileNavTrigger,
+.mobileNavScrim,
+.mobileNavSheet {
+  display: none;
+}
+
+.mobileTopBar {
+  position: sticky;
+  top: 0;
+  z-index: 3;
+  padding: 14px 16px;
+  background: var(--bg-header);
+}
+
+.mobileBrand { font-size: 16px; font-weight: 700; }
+
+/* position:fixed, not sticky - #musicBar below already relies on a
+   fixed wrapper to stay docked regardless of how far #mainContent's
+   own (whole-page, not internally-scrolled) content runs. */
+.bottomStack {
+  position: fixed;
+  left: 0;
+  right: 0;
+  bottom: 0;
+  z-index: 15;
+  display: flex;
+  flex-direction: column;
+}
+
+.mobileNavTrigger {
+  align-items: center;
+  justify-content: center;
+  gap: 8px;
+  background: var(--bg-header);
+  border: none;
+  border-top: 1px solid rgba(255, 255, 255, .08);
+  color: var(--text);
+  font-family: inherit;
+  font-size: 13px;
+  font-weight: 600;
+  padding: 13px;
+  padding-bottom: calc(13px + env(safe-area-inset-bottom, 0px));
+}
+
+.mobileNavScrim {
+  position: fixed;
+  inset: 0;
+  z-index: 20;
+  background: rgba(0, 0, 0, .5);
+  opacity: 0;
+  pointer-events: none;
+  transition: opacity .2s;
+}
+
+.mobileNavScrim.open { opacity: 1; pointer-events: auto; }
+
+.mobileNavSheet {
+  position: fixed;
+  left: 0;
+  right: 0;
+  bottom: 0;
+  z-index: 21;
+  max-height: 75vh;
+  overflow-y: auto;
+  background: var(--bg-header);
+  border-radius: 16px 16px 0 0;
+  padding: 8px 16px calc(20px + env(safe-area-inset-bottom, 0px));
+  transform: translateY(100%);
+  transition: transform .22s ease;
+  box-shadow: 0 -8px 24px rgba(0, 0, 0, .3);
+}
+
+.mobileNavSheet.open { transform: translateY(0); }
+
+.sheetGrabber {
+  width: 36px;
+  height: 4px;
+  border-radius: 99px;
+  background: var(--muted);
+  margin: 10px auto 6px;
+}
+
+/* Accueil and the (conditional) Listes de lecture row both use this -
+   same visual weight, bookending the "Bibliothèques" group between
+   them, so the one part whose size actually varies (however many
+   libraries Emby returns) reads as visually distinct from the two
+   fixed rows around it. */
+.sheetPrimary {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  width: 100%;
+  background: var(--panel);
+  border: none;
+  border-radius: 10px;
+  color: var(--text);
+  font-family: inherit;
+  font-size: 14px;
+  font-weight: 600;
+  padding: 12px;
+  margin: 4px 0;
+  text-decoration: none;
+}
+
+.sheetPrimary.active { background: var(--accent); color: #fff; }
+
+.sheetGrid {
+  display: grid;
+  grid-template-columns: 1fr 1fr;
+  gap: 8px;
+  margin: 4px 0 10px;
+}
+
+.sheetItem {
+  display: flex;
+  align-items: center;
+  gap: 9px;
+  background: var(--panel);
+  border-radius: 10px;
+  color: var(--text);
+  font-size: 13px;
+  padding: 12px 10px;
+  text-decoration: none;
+}
+
+.sheetItem.active { background: var(--accent); color: #fff; font-weight: 600; }
+
+.navIcon { width: 20px; height: 20px; flex-shrink: 0; display: block; }
+.navIcon svg { width: 100%; height: 100%; }
+
+.sheetLogout {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  gap: 8px;
+  width: 100%;
+  margin-top: 8px;
+  padding: 12px;
+  border: 1px solid rgba(255, 255, 255, .15);
+  border-radius: 10px;
+  color: var(--muted);
+  font-size: 13px;
+}
+
 @media (max-width: 720px) {
   .appShell { flex-direction: column; }
-  .sidebar {
-    width: 100%;
-    height: auto;
-    flex-direction: row;
-    align-items: center;
-    padding: 10px 12px;
-    overflow-x: auto;
-    overflow-y: hidden;
-  }
-  .sidebarBrand { padding: 0 12px 0 0; }
-  .sidebarNav { flex-direction: row; flex: none; }
-  .navSectionLabel { display: none; }
-  .sidebarLogout { margin: 0 0 0 12px; }
+  .sidebar { display: none; }
+  .mobileTopBar { display: flex; align-items: center; }
+  .mobileNavTrigger { display: flex; }
+  .mobileNavScrim { display: block; }
+  .mobileNavSheet { display: block; }
 }

client/src/shell/Shell.html

@@ -6,8 +6,37 @@
       <div class="navSectionLabel">Bibliothèques</div>
       <p class="hint" id="libStatus"><span class="spinner"></span>Chargement...</p>
     </nav>
-    <button class="linklike sidebarLogout" id="logout"></button>
+    <button class="linklike sidebarLogout logoutBtn" id="logout"></button>
   </aside>
+
+  <!-- Mobile-only (see Shell.css's 720px breakpoint) - the sidebar
+       above is display:none there instead of reshaping into a
+       horizontal bar. See docs/architecture.md's "Mobile navigation". -->
+  <header class="mobileTopBar">
+    <span class="mobileBrand">Watch Party</span>
+  </header>
+
   <main id="mainContent" class="mainContent"></main>
-  <div id="musicBar" class="musicBar"></div>
+
+  <!-- Wraps #musicBar so the trigger below always sits directly above
+       whatever height the bar actually renders at - see Shell.css. -->
+  <div class="bottomStack">
+    <div id="musicBar" class="musicBar"></div>
+    <button class="mobileNavTrigger" id="mobileNavTrigger" aria-expanded="false" aria-controls="mobileNavSheet">
+      Parcourir
+      <svg viewBox="0 0 24 24" width="14" height="14" aria-hidden="true">
+        <path d="M6 9l6 6 6-6" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></path>
+      </svg>
+    </button>
+  </div>
+
+  <div class="mobileNavScrim" id="mobileNavScrim"></div>
+  <div class="mobileNavSheet" id="mobileNavSheet">
+    <div class="sheetGrabber"></div>
+    <a href="#/home" class="navItem sheetPrimary"><span class="navIcon" data-icon="home"></span>Accueil</a>
+    <div class="navSectionLabel">Bibliothèques</div>
+    <div class="sheetGrid" id="mobileLibGrid"></div>
+    <div id="mobilePlaylistsSlot"></div>
+    <button class="linklike sheetLogout logoutBtn" id="mobileLogout"></button>
+  </div>
 </div>

client/src/shell/Shell.ts

@@ -5,41 +5,97 @@ import './Shell.css';
 import html from './Shell.html';
 import { auth, getLibraries, logout } from '../api/embyApi';
 import { initMusicBar } from '../musicBar/MusicBar';
+import type { LibraryDto } from '../types';
+
+// One icon per Emby CollectionType - only used by the mobile bottom
+// sheet (see docs/architecture.md's "Mobile navigation"); the desktop
+// sidebar stays plain text, unchanged. Same small inline-SVG-constant
+// convention as views/player/Player.ts's own icon strings.
+const HOME_ICON_SVG = '<svg viewBox="0 0 24 24"><path d="M3.5 11.5 12 4l8.5 7.5" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round"/><path d="M5.5 10v9a1 1 0 0 0 1 1H10v-5.5a1 1 0 0 1 1-1h2a1 1 0 0 1 1 1V20h3.5a1 1 0 0 0 1-1v-9" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round"/></svg>';
+const MOVIES_ICON_SVG = '<svg viewBox="0 0 24 24"><rect x="3.5" y="6" width="17" height="13" rx="1.5" fill="none" stroke="currentColor" stroke-width="1.8"/><path d="M3.5 6 7 3h3l-2.5 3M11 6l2.5-3h3L14 6m3.5 0 2.5-3" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round"/></svg>';
+const SHOWS_ICON_SVG = '<svg viewBox="0 0 24 24"><rect x="3" y="5.5" width="18" height="12" rx="1.5" fill="none" stroke="currentColor" stroke-width="1.8"/><path d="M9 20.5h6M12 17.5v3" stroke="currentColor" stroke-width="1.8" stroke-linecap="round"/></svg>';
+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>';
+// 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
+// glyph rather than rendering an empty icon slot.
+const GENERIC_LIBRARY_ICON_SVG = '<svg viewBox="0 0 24 24"><rect x="3.5" y="5" width="17" height="14" rx="2" fill="none" stroke="currentColor" stroke-width="1.8"/></svg>';
+
+const COLLECTION_ICONS: Record<string, string> = {
+  movies: MOVIES_ICON_SVG,
+  tvshows: SHOWS_ICON_SVG,
+  music: MUSIC_ICON_SVG,
+  musicvideos: MUSICVIDEOS_ICON_SVG,
+  playlists: PLAYLISTS_ICON_SVG,
+};
+
+/** One `<a>` per library, shared by the desktop sidebar (plain text)
+ *  and the mobile sheet (icon + text) - `withIcon` is the only
+ *  difference between the two call sites below. */
+function createLibraryLink(lib: LibraryDto, className: string, withIcon: boolean): HTMLAnchorElement {
+  const a = document.createElement('a');
+  a.href = `#/library/${lib.id}`;
+  a.className = className;
+  if (withIcon) {
+    const icon = document.createElement('span');
+    icon.className = 'navIcon';
+    icon.innerHTML = COLLECTION_ICONS[lib.collectionType] || GENERIC_LIBRARY_ICON_SVG;
+    a.appendChild(icon);
+  }
+  a.appendChild(document.createTextNode(lib.name));
+  return a;
+}
 
 export async function renderShell(appEl: HTMLElement): Promise<HTMLElement> {
   appEl.innerHTML = html;
-  appEl.querySelector('#logout')!.textContent = `Se déconnecter (${auth.userName || ''})`;
+
+  appEl.querySelector('[data-icon="home"]')!.innerHTML = HOME_ICON_SVG;
 
   // Mounted once, outside #mainContent, so a listen party survives
   // navigating the router - see musicBar/MusicBar.ts's header comment.
   initMusicBar(appEl.querySelector('#musicBar') as HTMLElement);
 
-  appEl.querySelector('#logout')!.addEventListener('click', async () => {
-    await logout();
-    // Simplest reliable way back to a bare login screen: a real reload,
-    // rather than hand-tearing-down every shell/router listener in place.
-    location.hash = '';
-    location.reload();
+  // Both the sidebar's and the mobile sheet's logout button - same
+  // label, same handler, one line each instead of a shared DOM node
+  // fought over by two very differently-laid-out containers.
+  appEl.querySelectorAll<HTMLButtonElement>('.logoutBtn').forEach((btn) => {
+    btn.textContent = `Se déconnecter (${auth.userName || ''})`;
+    btn.addEventListener('click', async () => {
+      await logout();
+      // Simplest reliable way back to a bare login screen: a real reload,
+      // rather than hand-tearing-down every shell/router listener in place.
+      location.hash = '';
+      location.reload();
+    });
   });
 
   const nav = appEl.querySelector('#sidebarNav')!;
   const status = appEl.querySelector('#libStatus')!;
+  const mobileLibGrid = appEl.querySelector('#mobileLibGrid')!;
+  const mobilePlaylistsSlot = appEl.querySelector('#mobilePlaylistsSlot')!;
   try {
     const libraries = await getLibraries();
     status.remove();
     libraries.forEach((lib) => {
-      const a = document.createElement('a');
-      a.href = `#/library/${lib.id}`;
-      a.className = 'navItem';
-      a.textContent = lib.name;
-      nav.appendChild(a);
+      nav.appendChild(createLibraryLink(lib, 'navItem', false));
+      // 'playlists' gets pulled out of the "Bibliothèques" group into
+      // its own fixed row - see docs/architecture.md. Everything else
+      // (movies/tvshows/music/musicvideos, whatever mix this server
+      // actually has) lands in the grid, unchanged in count or order.
+      if (lib.collectionType === 'playlists') {
+        mobilePlaylistsSlot.appendChild(createLibraryLink(lib, 'navItem sheetPrimary', true));
+      } else {
+        mobileLibGrid.appendChild(createLibraryLink(lib, 'navItem sheetItem', true));
+      }
     });
   } catch {
     status.textContent = 'Bibliothèques indisponibles.';
   }
 
   const highlight = () => {
-    nav.querySelectorAll('.navItem').forEach((a) => {
+    appEl.querySelectorAll('.navItem').forEach((a) => {
       const isHome = a.getAttribute('href') === '#/home';
       a.classList.toggle('active', a.getAttribute('href') === location.hash || (isHome && !location.hash));
     });
@@ -47,5 +103,29 @@ export async function renderShell(appEl: HTMLElement): Promise<HTMLElement> {
   highlight();
   window.addEventListener('hashchange', highlight);
 
+  // ---- Mobile bottom sheet - see Shell.css's "Mobile navigation". ----
+  const navTrigger = appEl.querySelector('#mobileNavTrigger') as HTMLButtonElement;
+  const navSheet = appEl.querySelector('#mobileNavSheet')!;
+  const navScrim = appEl.querySelector('#mobileNavScrim')!;
+  const closeMobileNav = () => {
+    navSheet.classList.remove('open');
+    navScrim.classList.remove('open');
+    navTrigger.setAttribute('aria-expanded', 'false');
+  };
+  navTrigger.addEventListener('click', () => {
+    const opening = !navSheet.classList.contains('open');
+    navSheet.classList.toggle('open', opening);
+    navScrim.classList.toggle('open', opening);
+    navTrigger.setAttribute('aria-expanded', String(opening));
+  });
+  navScrim.addEventListener('click', closeMobileNav);
+  // Any of the three zones (Accueil, a library, Listes de lecture) -
+  // the sheet itself has no other clickable children, so this one
+  // delegated listener covers all of them without a per-link handler.
+  navSheet.addEventListener('click', (e) => {
+    if ((e.target as HTMLElement).closest('.navItem')) closeMobileNav();
+  });
+  window.addEventListener('hashchange', closeMobileNav);
+
   return appEl.querySelector('#mainContent') as HTMLElement;
 }

docs/architecture.md

@@ -3561,6 +3561,102 @@ no device reachable from this sandbox, same standing gap as every
 other browser-native integration in this project (casting, PiP, the
 intro-skip buttons).
 
+## Mobile navigation: a bottom sheet, not a reshaped sidebar
+
+Asked for directly: the sidebar's old mobile treatment just reshaped
+itself into a horizontally-scrolling top bar under 720px (a single
+media query in Shell.css) - functional, but easy to miss (nothing
+signals there's more to scroll to) and it buried "Se déconnecter" at
+the far end of that scroll. Explored as a set of mockups first (four
+patterns compared side by side, including the tradeoffs of each) before
+writing any real code - the bottom sheet won out over a bottom tab bar
+(too few slots for an unbounded number of Emby libraries), a hamburger
+drawer (still the smallest code delta, but two taps for "Accueil" too),
+and a merely-polished version of the existing horizontal bar.
+
+**Structure mirrors the real data shape, not a flat list**: `getLibraries()`
+already returns each library's Emby `CollectionType` as `collectionType`
+on `LibraryDto` (`server/src/services/CatalogService.ts`) - confirmed by
+reading that service directly rather than assumed. The sheet uses it to
+render three zones instead of one flat list:
+
+- **Accueil** - one fixed row, always first.
+- **Bibliothèques** - a section label over a 2-column grid of every
+  library *except* the one whose `collectionType` is `'playlists'` -
+  this is the part whose count and contents genuinely depend on what
+  the connected Emby server has (2 libraries or 10, movies-only or
+  every type at once).
+- **Listes de lecture** - pulled out of that grid into its own fixed
+  row, same visual weight as Accueil, bookending the group. Only
+  rendered at all when a `'playlists'`-type library is actually
+  present - same conditional-presence rule the sidebar already applies
+  to every library type, just applied one level deeper here.
+
+Zero server-side work for this split - `collectionType` was already
+being sent, just never read on the client before now.
+
+**One `createLibraryLink()` builds both trees.** The desktop sidebar's
+existing plain-text links and the mobile sheet's icon+text links are
+different enough (icon or not, grid cell or plain row) that unifying
+them into one shared DOM subtree styled two ways would need more CSS
+trickery than it saves - so `Shell.ts` keeps two small render call
+sites, both reading the one `getLibraries()` result, sharing the one
+link-building function. The two logout buttons (sidebar footer, sheet
+footer) are separate DOM nodes for the same reason - same label, same
+`click` handler, wired once via `.logoutBtn` rather than `#logout`.
+
+**Icons are new** - the sidebar has never had any. Small inline SVGs,
+same "constant string, `currentColor`" convention `views/player/Player.ts`
+already uses for its own icons, one per Emby `CollectionType`
+(`movies`/`tvshows`/`music`/`musicvideos`/`playlists`) plus a generic
+fallback for any future type this app hasn't mapped yet.
+
+**The music bar's stacking, made structural instead of a magic number.**
+`MusicBar.css`'s `.musicBar` no longer positions itself - a new
+`.bottomStack` (`position: fixed; bottom: 0`, plain flex column) wraps
+it together with the new mobile nav trigger button, so the trigger
+always sits flush above the bar's *actual* rendered height. That
+height isn't constant - `.musicBarRow` wraps onto a second line on a
+narrow screen with a long track/artist name plus presence avatars -
+so a hardcoded pixel offset would have drifted; normal flow inside one
+shared fixed wrapper can't. Transparent to desktop: the trigger is
+`display: none` there, so `.bottomStack` just becomes a plain wrapper
+around the bar, unchanged from before.
+
+The sheet itself (`.mobileNavSheet`) and its scrim are independent
+`position: fixed` overlays above `.bottomStack`'s z-index, sliding up
+via `transform: translateY` - closes on: tapping the scrim, tapping any
+of the three zones' links (one delegated click listener, not one per
+link), or any `hashchange` (covers browser back/forward too, alongside
+the existing `highlight()` listener that already ran on that event for
+the active-link state - now widened from `#sidebarNav .navItem` to
+every `.navItem` on the page, so both trees highlight consistently).
+
+Verified: full `typecheck`/`build` (client only). The interaction logic
+- open/close, closing on a link tap, active-state highlighting, the
+grouped Accueil/Bibliothèques/Listes-de-lecture split, the conditional
+playlists row - was proven first in the mockup artifact (identical
+logic), then re-verified here directly against the real shipped
+`Shell.ts`/`Shell.html`/compiled `Shell.css`, wired up with fake library
+data (no Emby login reachable from this sandbox) since the real Shell
+only ever mounts after a real login: the desktop tree still renders
+correctly untouched at desktop width, the compiled CSS's media query
+and base mobile rules match what was written byte-for-byte, and the
+mobile sheet's open/close/navigate/logout interactions were driven
+programmatically end to end (`element.click()` still fires listeners on
+a `display: none` element, so this didn't need a real narrow viewport
+to exercise the logic itself). The music-bar/trigger stacking was
+confirmed visually with a synthetic long-track-title music bar sitting
+flush above the trigger, no gap or overlap. **Not verified**: the
+actual rendered layout at a genuinely narrow viewport - this sandbox's
+browser tool's viewport-emulation stopped taking effect partway through
+this session (`screen.width` reflected the requested size, `innerWidth`
+and `matchMedia` did not - a tooling issue hit repeatedly this session,
+not something in this app's code), so the mobile-width visual check
+above was done by forcing the same CSS rules through an injected
+override instead of a real ≤720px viewport. Worth an early real-phone
+check once deployed.
+
 ## Known limitations
 
 - Playback always goes through `hls.js` against whatever Emby's