feat: Remind Me Later, mobile bookmarks, bug fixes, and doc cleanup

Features:
- Remind Me Later: message context menu item opens a preset time picker
  (20 min / 1 hr / 3 hr / tomorrow 9am); reminders persist to Matrix
  account data (io.lotus.reminders); ReminderMonitor fires a Lotus Toast
  when due, checks every 30s and on tab focus
- Mobile Bookmarks: BookmarksPanel now renders on all screen sizes;
  passes isMobile prop for full-screen absolute overlay on mobile

Bug fixes:
- usePan.ts: memory leak from stale closure in document listener cleanup
- EventReaders.tsx: replace hardcoded hex colors with TDS CSS variables
- CallControls.tsx: replace hardcoded hex colors with TDS CSS variables
- CustomHtml.css.ts: replace hardcoded yellow/black highlight with theme tokens

Docs:
- LOTUS_TODO.md: restore deleted content (Confirmed facts table, Pending
  Audits, P5-30 completed status, full feature descriptions), keep new
  additions (P4-7/8/9, P5-41–57, Implementation Reference), eliminate
  duplicate sections
- LOTUS_BUGS.md: merge RESILIENCE_AUDIT.md findings into Architectural &
  Resilience Audit table; delete RESILIENCE_AUDIT.md
- Remove stale LOTUS_DENOISE_ENGINEERING_REVIEW.md and LOTUS_TODO_REFERENCE.md

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

src/app/features/room/message/Message.tsx

@@ -81,6 +81,7 @@ import { PowerIcon } from '../../../components/power';
 import colorMXID from '../../../../util/colorMXID';
 import { getPowerTagIconSrc } from '../../../hooks/useMemberPowerTag';
 import { ForwardMessageDialog } from './ForwardMessageDialog';
+import { RemindMeDialog } from './RemindMeDialog';
 import { useBookmarks } from '../../../hooks/useBookmarks';
 import { PresenceRingAvatar } from '../../../components/presence';
 import { AvatarDecoration } from '../../../components/avatar-decoration/AvatarDecoration';
@@ -809,6 +810,7 @@ export const Message = React.memo(
       const [menuAnchor, setMenuAnchor] = useState<RectCords>();
       const [emojiBoardAnchor, setEmojiBoardAnchor] = useState<RectCords>();
       const [forwardOpen, setForwardOpen] = useState(false);
+      const [remindOpen, setRemindOpen] = useState(false);
       const { addBookmark, removeBookmark, isBookmarked } = useBookmarks();
 
       const senderDisplayName =
@@ -1204,6 +1206,26 @@ export const Message = React.memo(
                                 </Text>
                               </MenuItem>
                             )}
+                            {!mEvent.isRedacted() && mEvent.getId() && (
+                              <MenuItem
+                                size="300"
+                                after={<Icon size="100" src={Icons.Clock} />}
+                                radii="300"
+                                onClick={() => {
+                                  setRemindOpen(true);
+                                  closeMenu();
+                                }}
+                              >
+                                <Text
+                                  className={css.MessageMenuItemText}
+                                  as="span"
+                                  size="T300"
+                                  truncate
+                                >
+                                  Remind Me
+                                </Text>
+                              </MenuItem>
+                            )}
                             {!isThreadedMessage && (
                               <MenuItem
                                 size="300"
@@ -1372,6 +1394,14 @@ export const Message = React.memo(
           {forwardOpen && (
             <ForwardMessageDialog mEvent={mEvent} onClose={() => setForwardOpen(false)} />
           )}
+          {remindOpen && mEvent.getId() && (
+            <RemindMeDialog
+              roomId={room.roomId}
+              eventId={mEvent.getId()!}
+              previewText={(mEvent.getContent()?.body as string | undefined)?.slice(0, 120) ?? ''}
+              onClose={() => setRemindOpen(false)}
+            />
+          )}
         </MessageBase>
       );
     },