fix(calls): the call bar shows "Call disconnected" and reconnects when sync is back (#318)

After a homeserver stall Element Call showed "Connection lost" while the
call bar still looked joined. Handle the fork's io.lotus.call_error:
show "Call disconnected" with a Reconnect button (io.lotus.reconnect),
and reconnect automatically once sync is back.

Fixes #318

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017PCb59uY3UKqDqt7B6hzd5

src/app/features/call-status/CallStatus.tsx

@@ -1,5 +1,5 @@
 import React, { useMemo } from 'react';
-import { Box, Spinner, Text, color } from 'folds';
+import { Box, Button, Spinner, Text, color } from 'folds';
 import { useAtomValue } from 'jotai';
 import classNames from 'classnames';
 import { LiveChip } from './LiveChip';
@@ -18,6 +18,7 @@ import { useMatrixClient } from '../../hooks/useMatrixClient';
 import { MemberSpeaking } from './MemberSpeaking';
 import { clockSkewAtom } from '../../state/clockSkew';
 import { describeSkewVsServer } from '../../utils/clockSkew';
+import { useCallError } from '../../hooks/useCallError';
 
 type CallStatusProps = {
   callEmbed: CallEmbed;
@@ -42,6 +43,8 @@ export function CallStatus({ callEmbed }: CallStatusProps) {
   const clockSkew = useAtomValue(clockSkewAtom);
 
   const compact = screenSize === ScreenSize.Mobile;
+  // [Gitea #318] The call dropped ("Connection lost" in the frame).
+  const callError = useCallError(callEmbed.control);
 
   const memberVisible = callJoined && callMembers.length > 0;
 
@@ -65,6 +68,25 @@ export function CallStatus({ callEmbed }: CallStatusProps) {
           {!compact && (
             <>
               <CallRoomName room={room} />
+              {callError && (
+                <>
+                  <StatusDivider />
+                  <Text size="T200" truncate role="alert" style={{ color: color.Critical.Main }}>
+                    Call disconnected
+                  </Text>
+                  {callError.recoverable && (
+                    <Button
+                      size="300"
+                      radii="300"
+                      variant="Critical"
+                      fill="Soft"
+                      onClick={() => callEmbed.control.reconnect()}
+                    >
+                      <Text size="B300">Reconnect</Text>
+                    </Button>
+                  )}
+                </>
+              )}
               {clockSkew.warning && clockSkew.skewMs !== null && (
                 <>
                   <StatusDivider />
@@ -102,8 +124,19 @@ export function CallStatus({ callEmbed }: CallStatusProps) {
       {memberVisible && !compact && <StatusDivider />}
       <Box shrink="No" alignItems="Center" gap="Inherit">
         {compact && (
-          <Box grow="Yes">
+          <Box grow="Yes" alignItems="Center" gap="200">
             <CallRoomName room={room} />
+            {callError?.recoverable && (
+              <Button
+                size="300"
+                radii="300"
+                variant="Critical"
+                fill="Soft"
+                onClick={() => callEmbed.control.reconnect()}
+              >
+                <Text size="B300">Reconnect</Text>
+              </Button>
+            )}
           </Box>
         )}
         <CallControl callJoined={callJoined} compact={compact} callEmbed={callEmbed} />