fix: Phase 1 critical+high fixes (17/18 items)

CRITICAL fixes:
- C1: Error swallowing - throw TransportError on network failure in getEmails/searchEmails
- C2: Recurrence expansion ID delimiter changed from ':' to '::occurrence::'
- C3: Cross-account calendar event UID dedup after multi-account aggregation
- C4: Admin session token revocation via JTI blacklist on logout
- C6: FTS5 schema-drop - add warning log for automatic reindex trigger
- C7: Settings lock - gate updateSetting() with isSettingLocked() check
- C8: Offline push pause - add offline event handler that closes push transports

HIGH fixes:
- H1: Push handler - add ContactCard and FileNode branches
- H2: WS fallback - await state snapshot before reconcileAfterWebSocketFallback
- H3: Auth rate limiting - add checkUserAuthRateLimit to session and token routes
- H4: OAuth logs - strip access_token from error log context
- H7: Template XSS - apply DOMPurify to HTML template body on import
- H8: Secure cookie - derive from x-forwarded-proto, not NODE_ENV
- H9: bcrypt fix - remove bcrypt prefixes from isHashed() so scrypt-only
- H13: calendarTasksEnabled - apply admin gate at runtime in calendar page
- H14: Task mutations - add try/catch error handling to update/delete/toggle
- H18: autoSelectReplyIdentity default changed from false to true

Deferred: P1.3 (C5 auth localStorage encryption) - requires custom Zustand persist adapter.

stores/email-store.ts

@@ -2940,6 +2940,25 @@ export const useEmailStore = create<EmailStore>((set, get) => ({
         }
       }
 
+      // Handle ContactCard state changes - refresh contacts
+      if (accountChanges?.ContactCard) {
+        const { useContactStore } = await import('./contact-store');
+        const contactStore = useContactStore.getState();
+        contactStore.fetchContacts(client).catch((err) => {
+          console.error('Failed to refresh contacts on push:', err);
+        });
+      }
+
+      // Handle FileNode state changes - refresh current directory
+      if (accountChanges?.FileNode) {
+        const { useFileStore } = await import('./file-store');
+        const fileStore = useFileStore.getState();
+        const currentParentId = fileStore.currentParentId;
+        fileStore.navigate(currentParentId).catch((err) => {
+          console.error('Failed to refresh files on push:', err);
+        });
+      }
+
       // Local search index last, with the refreshed ids (see above).
       scheduleIndexUpdate();
     } catch (error) {