fix: resilience, speaker animation, CSS variable fixes

- Wrap RoomTimeline in ErrorBoundary — a single bad event no longer
  crashes the entire timeline; shows a graceful "Timeline unavailable"
  message instead
- Wrap RoomInput in ErrorBoundary — composer crashes show a fallback
  placeholder rather than a blank white section
- Animate SpeakerAvatarOutline with a 1.2s pulse keyframe so it's
  visually distinct from a static ring; respects prefers-reduced-motion
- Fix var(--border-surface-variant) undefined variable in UserRoomProfile
  device session rows; replaced with color.SurfaceVariant.ContainerLine

UNTESTED — verify at chat.lotusguild.org post-deploy.

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

src/app/components/user-profile/UserRoomProfile.tsx

@@ -1,4 +1,4 @@
-import { Box, Button, config, Icon, IconButton, Icons, Spinner, Text, toRem } from 'folds';
+import { Box, Button, color, config, Icon, IconButton, Icons, Spinner, Text, toRem } from 'folds';
 import React, { useCallback, useEffect, useRef, useState } from 'react';
 import { useNavigate } from 'react-router-dom';
 import { VerificationRequest } from 'matrix-js-sdk/lib/crypto-api';
@@ -197,7 +197,7 @@ function UserDeviceSessions({ userId }: UserDeviceSessionsProps) {
               style={{
                 paddingTop: config.space.S100,
                 paddingBottom: config.space.S100,
-                borderTop: `${toRem(1)} solid var(--border-surface-variant)`,
+                borderTop: `${toRem(1)} solid ${color.SurfaceVariant.ContainerLine}`,
               }}
             >
               <UserDeviceRow userId={userId} device={device} />

src/app/features/call-status/styles.css.ts

@@ -1,4 +1,4 @@
-import { style } from '@vanilla-extract/css';
+import { keyframes, style } from '@vanilla-extract/css';
 import { color, config, toRem } from 'folds';
 
 export const LiveChipText = style({
@@ -16,6 +16,19 @@ export const ControlDivider = style({
   height: toRem(16),
 });
 
-export const SpeakerAvatarOutline = style({
-  boxShadow: `0 0 0 ${config.borderWidth.B600} ${color.Success.Main}`,
+const speakerPulse = keyframes({
+  '0%': { boxShadow: `0 0 0 ${config.borderWidth.B600} ${color.Success.Main}` },
+  '50%': { boxShadow: `0 0 0 ${toRem(4)} ${color.Success.ContainerActive}` },
+  '100%': { boxShadow: `0 0 0 ${config.borderWidth.B600} ${color.Success.Main}` },
+});
+
+export const SpeakerAvatarOutline = style({
+  '@media': {
+    '(prefers-reduced-motion: no-preference)': {
+      animation: `${speakerPulse} 1200ms ease-in-out infinite`,
+    },
+    '(prefers-reduced-motion: reduce)': {
+      boxShadow: `0 0 0 ${config.borderWidth.B600} ${color.Success.Main}`,
+    },
+  },
 });

src/app/features/room/RoomView.tsx

@@ -1,4 +1,5 @@
 import React, { useCallback, useMemo, useRef } from 'react';
+import { ErrorBoundary } from 'react-error-boundary';
 import { Box, Text, config } from 'folds';
 import { EventType } from 'matrix-js-sdk';
 import { ReactEditor } from 'slate-react';
@@ -109,13 +110,31 @@ export function RoomView({ eventId }: { eventId?: string }) {
   return (
     <Page ref={roomViewRef} style={chatBgStyle}>
       <Box grow="Yes" direction="Column">
-        <RoomTimeline
-          key={roomId}
-          room={room}
-          eventId={eventId}
-          roomInputRef={roomInputRef}
-          editor={editor}
-        />
+        <ErrorBoundary
+          fallback={
+            <Box
+              grow="Yes"
+              direction="Column"
+              alignItems="Center"
+              justifyContent="Center"
+              gap="400"
+              style={{ padding: config.space.S400, opacity: 0.7 }}
+            >
+              <Text size="H4">Timeline unavailable</Text>
+              <Text size="T300" align="Center">
+                An error occurred while rendering messages. Try refreshing the page.
+              </Text>
+            </Box>
+          }
+        >
+          <RoomTimeline
+            key={roomId}
+            room={room}
+            eventId={eventId}
+            roomInputRef={roomInputRef}
+            editor={editor}
+          />
+        </ErrorBoundary>
         <RoomViewTyping room={room} />
       </Box>
       <Box shrink="No" direction="Column">
@@ -129,13 +148,27 @@ export function RoomView({ eventId }: { eventId?: string }) {
           ) : (
             <>
               {canMessage && (
-                <RoomInput
-                  room={room}
-                  editor={editor}
-                  roomId={roomId}
-                  fileDropContainerRef={roomViewRef}
-                  ref={roomInputRef}
-                />
+                <ErrorBoundary
+                  fallback={
+                    <RoomInputPlaceholder
+                      style={{ padding: config.space.S200 }}
+                      alignItems="Center"
+                      justifyContent="Center"
+                    >
+                      <Text align="Center">
+                        Message composer encountered an error. Try refreshing.
+                      </Text>
+                    </RoomInputPlaceholder>
+                  }
+                >
+                  <RoomInput
+                    room={room}
+                    editor={editor}
+                    roomId={roomId}
+                    fileDropContainerRef={roomViewRef}
+                    ref={roomInputRef}
+                  />
+                </ErrorBoundary>
               )}
               {!canMessage && (
                 <RoomInputPlaceholder