fix: GIF CSP + edit history HTML rendering + unhandled rejection cleanup

- nginx (LXC 106, live): added https://*.giphy.com to connect-src CSP —
  browser was blocking fetch() to media2.giphy.com CDN with CSP violation
- EditHistoryModal: render formatted_body as sanitized HTML (via
  html-react-parser + sanitizeCustomHtml) with linkification for plain
  text, matching how messages render in the timeline
- useAsyncCallback + ThumbnailContent + ImageContent + VideoContent +
  ClientConfigLoader: use .catch(() => undefined) instead of void to
  silence unhandled promise rejections from fire-and-forget useEffect
  calls — errors already captured in AsyncState.Error for UI display

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

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

@@ -1,4 +1,6 @@
-import React, { useCallback, useEffect } from 'react';
+import React, { ReactNode, useCallback, useEffect } from 'react';
+import parse from 'html-react-parser';
+import Linkify from 'linkify-react';
 import FocusTrap from 'focus-trap-react';
 import {
   Box,
@@ -18,6 +20,8 @@ import {
 import { MatrixEvent, Room } from 'matrix-js-sdk';
 import { useMatrixClient } from '../../../hooks/useMatrixClient';
 import { stopPropagation } from '../../../utils/keyboard';
+import { sanitizeCustomHtml } from '../../../utils/sanitize';
+import { LINKIFY_OPTS } from '../../../plugins/react-custom-html-parser';
 import { AsyncStatus, useAsyncCallback } from '../../../hooks/useAsyncCallback';
 import { timeDayMonYear, timeHourMinute } from '../../../utils/time';
 import { useSetting } from '../../../state/hooks/settings';
@@ -52,17 +56,24 @@ function isRawEditEvent(raw: unknown): raw is RawEditEvent {
   return typeof r.event_id === 'string' && typeof r.origin_server_ts === 'number';
 }
 
-function getVersionBody(evt: MatrixEvent): string {
+function getVersionContent(evt: MatrixEvent): ReactNode {
   const content = evt.getContent();
   const newContent = content['m.new_content'] as Record<string, unknown> | undefined;
   const source = newContent ?? content;
 
+  const format = source.format;
   const formattedBody = source.formatted_body;
-  if (typeof formattedBody === 'string') {
-    return formattedBody.replace(/<[^>]+>/g, '').trim() || '(no text)';
+  if (
+    format === 'org.matrix.custom.html' &&
+    typeof formattedBody === 'string' &&
+    formattedBody.trim()
+  ) {
+    return parse(sanitizeCustomHtml(formattedBody));
   }
+
   const body = source.body;
-  return typeof body === 'string' ? body : '(no text)';
+  const text = typeof body === 'string' ? body : '(no text)';
+  return <Linkify options={LINKIFY_OPTS}>{text}</Linkify>;
 }
 
 export function EditHistoryModal({ room, mEvent, onClose }: EditHistoryModalProps) {
@@ -106,7 +117,7 @@ export function EditHistoryModal({ room, mEvent, onClose }: EditHistoryModalProp
   );
 
   useEffect(() => {
-    void fetchHistory().catch(() => undefined);
+    fetchHistory().catch(() => undefined);
   }, [fetchHistory]);
 
   const formatTs = (ts: number): string => {
@@ -115,11 +126,7 @@ export function EditHistoryModal({ room, mEvent, onClose }: EditHistoryModalProp
     return `${date} at ${time}`;
   };
 
-  const originalBody = (() => {
-    const content = mEvent.getContent();
-    const body = content.body;
-    return typeof body === 'string' ? body : '(no text)';
-  })();
+  const originalContent = getVersionContent(mEvent);
 
   const originalTs = mEvent.getTs();
 
@@ -189,7 +196,7 @@ export function EditHistoryModal({ room, mEvent, onClose }: EditHistoryModalProp
                         </Text>
                       </Box>
                       <Text size="T300" style={{ whiteSpace: 'pre-wrap', wordBreak: 'break-word' }}>
-                        {originalBody}
+                        {originalContent}
                       </Text>
                     </Box>
 
@@ -209,7 +216,7 @@ export function EditHistoryModal({ room, mEvent, onClose }: EditHistoryModalProp
                           size="T300"
                           style={{ whiteSpace: 'pre-wrap', wordBreak: 'break-word' }}
                         >
-                          {getVersionBody(editEvt)}
+                          {getVersionContent(editEvt)}
                         </Text>
                       </Box>
                     ))}