fix: respect time format preference in UI

Add shared time formatting helpers that apply the Appearance time format preference consistently. Update visible time labels across chat, quota usage, scheduled tasks, tunnels, context details, git views, PR metadata, and passkey settings to use the selected 12-hour, 24-hour, or automatic format. Leave date-only and non-UI formatting untouched so unrelated behavior does not change.

packages/ui/src/components/views/git/PullRequestSection.tsx

@@ -28,6 +28,7 @@ import { MobileOverlayPanel } from '@/components/ui/MobileOverlayPanel';
 import { SimpleMarkdownRenderer } from '@/components/chat/MarkdownRenderer';
 import { Icon } from "@/components/icon/Icon";
 import { useUIStore } from '@/stores/useUIStore';
+import { formatDateTimeForPreference } from '@/lib/timeFormat';
 import { useSessionUIStore } from '@/sync/session-ui-store';
 import { useSelectionStore } from '@/sync/selection-store';
 import { useConfigStore } from '@/stores/useConfigStore';
@@ -309,6 +310,7 @@ export const PullRequestSection: React.FC<{
   onGeneratedDescription?: () => void;
 }> = ({ directory, branch, baseBranch, trackingBranch, remotes = [], remoteBranches = [], onGeneratedDescription }) => {
   const { t } = useI18n();
+  const timeFormatPreference = useUIStore((state) => state.timeFormatPreference);
   const { github } = useRuntimeAPIs();
   const githubAuthStatus = useGitHubAuthStore((state) => state.status);
   const githubAuthChecked = useGitHubAuthStore((state) => state.hasChecked);
@@ -627,8 +629,14 @@ export const PullRequestSection: React.FC<{
     if (!Number.isFinite(ts)) {
       return value;
     }
-    return new Date(ts).toLocaleString();
-  }, []);
+    return formatDateTimeForPreference(ts, timeFormatPreference, {
+      year: 'numeric',
+      month: 'short',
+      day: 'numeric',
+      hour: 'numeric',
+      minute: '2-digit',
+    });
+  }, [timeFormatPreference]);
 
   const connectedGitHubLogin = React.useMemo(() => {
     const login = githubAuthStatus?.user?.login;