fix(ui): resolve 29 native UI/UX inconsistencies from folds design audit

Fixes N1–N94 findings from LOTUS_BUGS.md audit pass. Key changes:

- ProfileDecoration: raw <button> → folds <Button> for save/remove; remove
  undefined --accent-cyan var
- UserRoomProfile: textarea border uses color.SurfaceVariant.ContainerLine
  and config tokens instead of undefined --border-interactive var
- LotusToastContainer: z-index raised from 9997 → 10001 so toasts appear
  above Night Light overlay (9998) and modals (9999)
- Message.tsx: DeliveryStatus replaces Unicode glyphs with Icon components;
  MessageQuickReactions returns null instead of <span />; forward menu item
  gets correct size="100" on after icon
- AudioContent: speed chip variant/radii now matches Play chip (Secondary/300)
- ReadReceiptAvatars: pill border/radius/padding → folds config tokens;
  remove dead receipt-pill-btn className
- EventReaders: Header size 600→500; close button gets radii="300";
  borderBottom shorthand → borderBottomWidth token; remove raw fontSize
- General.tsx: selected background/seasonal picker border uses
  color.Primary.Main instead of color.Critical.Main (error red)
- RoomInsights: SectionHeader drops textTransform/letterSpacing/opacity;
  chart borderRadius → config tokens; remove raw fontSize:9;
  warning banner → SequenceCard
- RoomProfile.tsx: formatting toolbar raw <button> → folds <Button>;
  topic read-mode renders formatted_body via sanitizeCustomHtml
- MsgTypeRenderers: location Open button Chip→Button; opacity:0.65→priority
- UploadCardRenderer: caption raw <input> → folds <Input>
- VoiceMessageRecorder: replace undefined --bg-surface-variant/--tc-*
  vars with color.* tokens; replace bare <audio controls> with
  IconButton play/pause toggle
- App.tsx: mention highlight uses WCAG 2.1 relative luminance (gamma
  linearization) instead of simplified approximation; border now rgba
  semi-transparent instead of same color as background
- RoomNavItem: Mute MenuItem icon moved to before prop
- SearchFilters: HasLink chip variant="Success" outlined to match filter bar
- RoomViewHeader: Server Notice chip radii Pill→300; fix jotai import order
- Fix ESLint import/order errors in DeviceVerificationSetup, RoomTopicViewer,
  MediaGallery, and RoomViewHeader

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

src/app/components/event-readers/EventReaders.tsx

@@ -67,11 +67,11 @@ export const EventReaders = as<'div', EventReadersProps>(
         <Header
           className={css.Header}
           variant="Surface"
-          size="600"
+          size="500"
           style={
             lotusTerminal
               ? {
-                  borderBottom: '1px solid var(--lt-border-color)',
+                  borderBottomWidth: config.borderWidth.B300,
                   boxShadow: 'var(--lt-box-glow-cyan)',
                 }
               : undefined
@@ -93,7 +93,7 @@ export const EventReaders = as<'div', EventReadersProps>(
               Seen by
             </Text>
           </Box>
-          <IconButton size="300" onClick={requestClose} aria-label="Close">
+          <IconButton size="300" radii="300" onClick={requestClose} aria-label="Close">
             <Icon src={Icons.Cross} />
           </IconButton>
         </Header>
@@ -141,14 +141,14 @@ export const EventReaders = as<'div', EventReadersProps>(
                       {receiptTs !== undefined && (
                         <Text
                           size="T200"
+                          priority="300"
                           style={
                             lotusTerminal
                               ? {
                                   color: 'var(--lt-accent-amber)',
                                   textShadow: 'var(--lt-glow-amber)',
-                                  fontSize: '0.72rem',
                                 }
-                              : { opacity: 0.6 }
+                              : undefined
                           }
                         >
                           {formatReadTs(receiptTs, hour24Clock)}