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/components/event-readers/EventReaders.tsx

@@ -71,8 +71,8 @@ export const EventReaders = as<'div', EventReadersProps>(
           style={
             lotusTerminal
               ? {
-                  borderBottom: '1px solid rgba(0,212,255,0.30)',
-                  boxShadow: '0 2px 12px rgba(0,212,255,0.08)',
+                  borderBottom: '1px solid var(--lt-border-color)',
+                  boxShadow: 'var(--lt-box-glow-cyan)',
                 }
               : undefined
           }
@@ -83,8 +83,8 @@ export const EventReaders = as<'div', EventReadersProps>(
               style={
                 lotusTerminal
                   ? {
-                      color: '#00D4FF',
-                      textShadow: '0 0 6px rgba(0,212,255,0.45)',
+                      color: 'var(--lt-accent-cyan)',
+                      textShadow: 'var(--lt-glow-cyan)',
                       letterSpacing: '0.05em',
                     }
                   : undefined
@@ -144,8 +144,8 @@ export const EventReaders = as<'div', EventReadersProps>(
                           style={
                             lotusTerminal
                               ? {
-                                  color: '#FFB300',
-                                  textShadow: '0 0 5px rgba(255,179,0,0.45)',
+                                  color: 'var(--lt-accent-amber)',
+                                  textShadow: 'var(--lt-glow-amber)',
                                   fontSize: '0.72rem',
                                 }
                               : { opacity: 0.6 }