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

lib/jmap/client-interface.ts

@@ -300,7 +300,7 @@ export interface IJMAPClient {
   deleteCalendarEvent(eventId: string, sendSchedulingMessages?: boolean, targetAccountId?: string): Promise<void>;
   batchDeleteCalendarEvents(eventIds: string[], targetAccountId?: string): Promise<{ destroyed: string[]; notDestroyed: string[] }>;
   queryCalendarEvents(filter: CalendarEventFilter, sort?: Array<{ property: string; isAscending: boolean }>, limit?: number, targetAccountId?: string): Promise<CalendarEvent[]>;
-  queryAllCalendarEvents(filter: CalendarEventFilter, sort?: Array<{ property: string; isAscending: boolean }>, limit?: number): Promise<CalendarEvent[]>;
+  queryAllCalendarEvents(filter: CalendarEventFilter, sort?: Array<{ property: string; isAscending: boolean }>, limit?: number, accountId?: string): Promise<CalendarEvent[]>;
   parseCalendarEvents(accountId: string, blobId: string): Promise<Partial<CalendarEvent>[]>;
 
   // ── Calendar Tasks ────────────────────────────────────────────