fix: Phase 2 QA — all 25 remaining HIGH/MEDIUM/LOW issues

HIGH fixes (7):
- H1: VNCdirectory admin i18n — 30+ translation keys added
- H2: handleSave try/catch with error toast
- H3: Free/busy accountId scoping
- H4: cancelEventBookings filter by eventId
- H5: Resource picker static apiFetch import
- H6: Sharing-store toast messages via lastMessage state
- H7: roleLabel for all resource types

MEDIUM fixes (11):
- M1: identitySignatureMap cleanup on delete
- M2: Now-line relative positioning
- M3: Radial menu disabled item keyboard nav
- M4: Radial menu stable event listener via refs
- M5: cancelBooking error on missing booking
- M6: PasswordRow isMasked state flag
- M7: Extract shared rights into lib/sharing-rights.ts
- M8: VNCtalk client server-side guard
- M9: Collabora configManager instead of process.env
- M10: CONFIG_ENV_MAP VNCdirectory fields
- M11: SENSITIVE_CONFIG_KEYS field name unification

LOW fixes (7):
- L1-L3: Unused imports removed
- L4: aria-labels on close, clear, search, spinner
- L5-L7: Comments for intentional patterns, null guard

stores/resource-store.ts

@@ -121,7 +121,11 @@ export const useResourceStore = create<ResourceState>()((set, get) => ({
   cancelBooking: async (bookingId: string) => {
     const { bookings } = get();
     const booking = bookings.find((b) => b.id === bookingId);
-    if (!booking) return;
+    if (!booking) {
+      console.error(`cancelBooking: booking with id "${bookingId}" not found`);
+      set({ bookingError: `Booking ${bookingId} not found` });
+      return;
+    }
 
     try {
       const res = await apiFetch(
@@ -136,9 +140,10 @@ export const useResourceStore = create<ResourceState>()((set, get) => ({
     }
   },
 
-  cancelEventBookings: async (_eventId: string) => {
+  cancelEventBookings: async (eventId: string) => {
     const { bookings } = get();
-    for (const booking of bookings) {
+    const eventBookings = bookings.filter((b) => b.eventId === eventId);
+    for (const booking of eventBookings) {
       try {
         const res = await apiFetch(
           `/api/resources/${booking.resourceId}/book/${booking.id}`,
@@ -149,6 +154,6 @@ export const useResourceStore = create<ResourceState>()((set, get) => ({
         // silently fail
       }
     }
-    set({ bookings: [] });
+    set({ bookings: bookings.filter((b) => b.eventId !== eventId) });
   },
 }));