fix: settings dropdowns, background animations, ringing, avatar decorations

Settings dropdowns (Bug #3):
- Add reusable SettingsSelect component using Menu+PopOut+FocusTrap — exact
  same pattern as Message Layout, so all dropdowns look consistent
- Replace raw <select> for Seasonal Theme, UI Font, AFK Timeout, and
  Join & Leave Sounds with SettingsSelect

Animated chat backgrounds bleeding onto content (Bug #6 / #7):
- Remove filter:brightness() and opacity animations from chatBackground.ts
  (animRainGlowKeyframe, animGridBrightnessKeyframe, animFirefliesGlowKeyframe,
  animFirefliesBlinkKeyframe). These were applied to the Page element which
  caused ALL descendants (messages, composer) to flash in sync.
  Also created a CSS stacking context on Page that pushed SeasonalEffect
  (position:fixed; z-index:9997) behind the animated background layer.
- Only backgroundPosition / backgroundSize animations remain — safe, do not
  affect descendants, and do not create stacking contexts.
- Remove now-unused animation keyframe imports from chatBackground.ts.

Voice ringing in persistent rooms (Bug #5):
- Narrow the ringing condition from (Invite|Knock|Restricted) to only Invite,
  matching exactly the rooms where the call button is visible.
- Add room.isCallRoom() early-exit so m.join_rule:call rooms never ring.

Avatar decoration images not loading (Bug #8):
- Change loading="lazy" → loading="eager" in DecorationPreviewCell.
  Lazy loading does not reliably trigger for images inside nested overflow
  scroll containers (the settings panel scroll area), so images never loaded.

Docs: LOTUS_BUGS.md updated with root cause and resolution for all 5 new bugs.
Docs: LOTUS_TODO.md adds P5-35/P5-36 (deferred desktop notification/jump list).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/components/CallEmbedProvider.tsx

@@ -325,21 +325,15 @@ function IncomingCallListener({ callEmbed, joined }: IncomingCallListenerProps)
       );
       if (!hasCallPermission) return;
 
-      // Only ring for DMs or private non-space group chats.
-      // Space voice channels and public rooms fire room-level RTC notifications
-      // whenever anyone joins — ringing every member is incorrect behaviour.
+      // Only ring in rooms where the call button is visible: DMs or invite-only rooms
+      // with no space parent. Persistent voice rooms (call rooms), space channels,
+      // restricted rooms, and public rooms must never trigger ringing.
+      if (room.isCallRoom()) return;
       const isDirect = directs.has(room.roomId);
-      // m.space.parent uses the parent space ID as the state key, so getStateEvent
-      // (which defaults to stateKey='') always returns undefined. Use getStateEvents
-      // (no key filter) to detect any space parent relationship.
       const isSpaceChild = getStateEvents(room, StateEvent.SpaceParent).length > 0;
       const joinRule = room.getJoinRule();
-      const isPrivateGroup =
-        !isSpaceChild &&
-        (joinRule === JoinRule.Invite ||
-          joinRule === JoinRule.Knock ||
-          joinRule === JoinRule.Restricted);
-      if (!isDirect && !isPrivateGroup) return;
+      const isPrivateInviteGroup = !isSpaceChild && joinRule === JoinRule.Invite;
+      if (!isDirect && !isPrivateInviteGroup) return;
 
       const info: IncomingCallInfo = {
         room,