chore: upgrade i18next 26, prettier 3, fontsource-variable, domhandler 6, lint-staged 17

- i18next 23->26 + react-i18next 15->17
- prettier 2->3, reformat all files
- replace @fontsource/inter with @fontsource-variable/inter 5, update import path
- domhandler 5->6 (aligns with transitive deps)
- lint-staged 16->17

src/app/pages/client/ClientNonUIFeatures.tsx

@@ -100,7 +100,7 @@ function InviteNotifications() {
         noti.close();
       };
     },
-    [navigate]
+    [navigate],
   );
 
   const playSound = useCallback(() => {
@@ -169,7 +169,7 @@ function MessageNotifications() {
       notifRef.current?.close();
       notifRef.current = noti;
     },
-    [navigate]
+    [navigate],
   );
 
   const playSound = useCallback(() => {
@@ -183,7 +183,7 @@ function MessageNotifications() {
       room,
       toStartOfTimeline,
       removed,
-      data
+      data,
     ) => {
       if (mx.getSyncState() !== 'SYNCING') return;
       if (document.hasFocus() && (selectedRoomId === room?.roomId || notificationSelected)) return;
@@ -218,7 +218,7 @@ function MessageNotifications() {
         notify({
           roomName: room.name ?? 'Unknown',
           roomAvatar: avatarMxc
-            ? mxcUrlToHttp(mx, avatarMxc, useAuthentication, 96, 96, 'crop') ?? undefined
+            ? (mxcUrlToHttp(mx, avatarMxc, useAuthentication, 96, 96, 'crop') ?? undefined)
             : undefined,
           username: getMemberDisplayName(room, sender) ?? getMxIdLocalPart(sender) ?? sender,
           roomId: room.roomId,