feat(menu-lecteur): refonte UI/UX professionnelle du menu FAB

- FAB : pastille verre depoli 40px + icone sliders (standard options)
- Panneau : en-tete (titre + fermer), verre depoli, ombre profonde, coins arrondis
- Animations ouverture/fermeture (fondu + slide + scale), fermeture Echap + clic exterieur
- Items : hover/active/focus, icones teintees, sections + separateurs raffinés
- Playlist : modale rendue HORS du panneau (backdrop-filter piegeait position:fixed)

index.css

@@ -573,35 +573,143 @@ body {
 }
 
 /* --- Player FAB menu (shared /watch & /shorts) ---------------------------- */
-/* Items/coque du panneau du menu flottant : petits, translucides, harmonisés
-   avec les commandes overlay des players YouTube/Dailymotion. */
+/* Coque du menu flottant : pastille « verre dépoli », panneau en élévation
+   avec en-tête, entrée/sortie animées. Harmonisé avec les commandes overlay
+   des players YouTube/Dailymotion (fond sombre translucide, blur, ring fin). */
+
+/* Pastille FAB (haut-gauche du lecteur). */
+.pm-fab {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 2.5rem;              /* 40px */
+  height: 2.5rem;
+  border-radius: 9999px;
+  color: #fff;
+  background: rgba(0, 0, 0, .55);
+  border: 1px solid rgba(255, 255, 255, .14);
+  backdrop-filter: blur(8px);
+  -webkit-backdrop-filter: blur(8px);
+  cursor: pointer;
+  transition: background-color .15s ease, border-color .15s ease, transform .15s ease;
+}
+.pm-fab svg { width: 1.125rem; height: 1.125rem; }
+.pm-fab:hover { background: rgba(0, 0, 0, .72); border-color: rgba(255, 255, 255, .24); }
+.pm-fab:active { transform: scale(.93); }
+.pm-fab-open { background: rgba(0, 0, 0, .72); border-color: rgba(255, 255, 255, .24); }
+.pm-fab:focus-visible { outline: 2px solid rgba(255, 255, 255, .55); outline-offset: 2px; }
+
+/* Panneau déroulant (toujours monté, animé via open/close). */
+.pm-panel {
+  position: absolute;
+  top: calc(100% + 0.5rem);
+  left: 0;
+  width: 18rem;               /* 288px */
+  max-height: min(70vh, 480px);
+  display: flex;
+  flex-direction: column;
+  overflow: hidden;
+  border-radius: 1rem;
+  background: rgba(15, 23, 42, .92);   /* slate-900/92 */
+  border: 1px solid rgba(255, 255, 255, .1);
+  box-shadow: 0 18px 50px rgba(0, 0, 0, .55), 0 2px 10px rgba(0, 0, 0, .35);
+  backdrop-filter: blur(24px);
+  -webkit-backdrop-filter: blur(24px);
+  opacity: 0;
+  transform: translateY(-6px) scale(.97);
+  transform-origin: top left;
+  visibility: hidden;
+  pointer-events: none;
+  transition: opacity .18s ease, transform .18s cubic-bezier(.2, .9, .3, 1), visibility 0s linear .18s;
+}
+.pm-panel-open {
+  opacity: 1;
+  transform: translateY(0) scale(1);
+  visibility: visible;
+  pointer-events: auto;
+  transition: opacity .18s ease, transform .18s cubic-bezier(.2, .9, .3, 1);
+}
+
+/* En-tête : titre + bouton fermer. */
+.pm-panel-header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 0.75rem;
+  padding: 0.625rem 0.625rem 0.625rem 0.875rem;
+  border-bottom: 1px solid rgba(255, 255, 255, .08);
+  flex-shrink: 0;
+}
+.pm-panel-title {
+  font-size: 0.8125rem;
+  font-weight: 600;
+  letter-spacing: .02em;
+  color: rgba(255, 255, 255, .92);
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+.pm-panel-close {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 1.75rem;
+  height: 1.75rem;
+  border-radius: 9999px;
+  color: rgba(255, 255, 255, .7);
+  flex-shrink: 0;
+  transition: background-color .15s ease, color .15s ease;
+}
+.pm-panel-close svg { width: 1rem; height: 1rem; }
+.pm-panel-close:hover { background: rgba(255, 255, 255, .1); color: #fff; }
+.pm-panel-close:focus-visible { outline: 2px solid rgba(255, 255, 255, .5); outline-offset: 1px; }
+
+/* Corps scrollable du panneau. */
+.pm-panel-body {
+  padding: 0.5rem;
+  overflow-y: auto;
+  overscroll-behavior: contain;
+  flex: 1;
+  min-height: 0;
+}
+.pm-panel-body::-webkit-scrollbar { width: 6px; }
+.pm-panel-body::-webkit-scrollbar-thumb { background: rgba(255, 255, 255, .18); border-radius: 9999px; }
+
+/* Libellé de section. */
 .pm-section-label {
-  padding: 0.375rem 0.75rem 0.25rem;
+  padding: 0.625rem 0.75rem 0.375rem;
   font-size: 0.6875rem; /* 11px */
   font-weight: 600;
-  letter-spacing: 0.04em;
+  letter-spacing: 0.06em;
   text-transform: uppercase;
   color: var(--muted);
 }
+
+/* Élément de menu. */
 .pm-item {
   display: flex;
   align-items: center;
-  gap: 0.625rem;
+  gap: 0.75rem;
   width: 100%;
-  padding: 0.5rem 0.75rem;
-  border-radius: 0.5rem;
-  font-size: 0.8125rem; /* 13px */
+  padding: 0.5625rem 0.75rem;
+  border-radius: 0.625rem;
+  font-size: 0.84375rem; /* 13.5px */
   color: var(--text);
   text-align: left;
-  line-height: 1.25;
-  transition: background-color .15s ease;
+  line-height: 1.3;
+  cursor: pointer;
+  transition: background-color .12s ease, color .12s ease;
 }
 .pm-item:hover { background-color: rgba(255, 255, 255, .08); }
+.pm-item:active { background-color: rgba(255, 255, 255, .12); }
+.pm-item:focus-visible { outline: 2px solid rgba(255, 255, 255, .35); outline-offset: -2px; }
 .pm-item:disabled { opacity: .4; cursor: not-allowed; }
-.pm-item svg { flex-shrink: 0; }
+.pm-item svg { flex-shrink: 0; color: rgba(255, 255, 255, .75); }
 .pm-item .pm-item-label { flex: 1; min-width: 0; }
-.pm-item .pm-item-hint { font-size: 0.6875rem; color: var(--muted); }
-.pm-sep { height: 1px; margin: 0.375rem 0.5rem; background: rgba(255, 255, 255, .12); }
+.pm-item .pm-item-hint { font-size: 0.71875rem; color: var(--muted); }
+
+/* Séparateur. */
+.pm-sep { height: 1px; margin: 0.375rem 0.625rem; background: rgba(255, 255, 255, .08); }
 
 /* --- Drawer / overlay plumbing -------------------------------------------- */
 /* Applied to <body> while a full-screen drawer or modal owns the viewport.