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

components/calendar/free-busy-view.tsx

@@ -89,6 +89,7 @@ export function FreeBusyView({
 }: FreeBusyViewProps) {
   const t = useTranslations("calendar");
   const client = useAuthStore((s) => s.client);
+  const activeAccountId = useAuthStore((s) => s.activeAccountId);
   const [freeBusyData, setFreeBusyData] = useState<Map<string, FreeBusySlot[]> | null>(null);
   const [loading, setLoading] = useState(false);
   const [hoveredSlot, setHoveredSlot] = useState<{
@@ -114,7 +115,7 @@ export function FreeBusyView({
     if (!client || participants.length === 0) return;
     let cancelled = false;
     setLoading(true);
-    fetchFreeBusy(client, participants, startDate, endDate)
+    fetchFreeBusy(client, participants, startDate, endDate, activeAccountId ?? undefined)
       .then((data) => {
         if (!cancelled) {
           setFreeBusyData(data);
@@ -164,7 +165,8 @@ export function FreeBusyView({
         )}
       </div>
 
-      <div className="overflow-auto border border-border rounded-lg">
+      <div className="relative">
+        <div className="overflow-auto border border-border rounded-lg">
         <div className="min-w-max" style={{ minWidth: totalHalfHourSlots * 24 + 200 }}>
           <table className="w-full border-collapse text-xs">
             <thead>
@@ -242,9 +244,12 @@ export function FreeBusyView({
                                 : "opacity-70"
                             )}
                             title={format(hourSlot.start, "HH:mm")}
-                            onClick={() =>
-                              isFree ? handleSlotClick(slot!) : undefined
-                            }
+                            onClick={() => {
+                              if (!isFree) return;
+                              const s = slot;
+                              if (!s) return;
+                              handleSlotClick(s);
+                            }}
                             onMouseEnter={() =>
                               setHoveredSlot({
                                 participant: key,
@@ -324,6 +329,7 @@ export function FreeBusyView({
           }}
         />
       )}
+      </div>
 
       <div className="flex items-center gap-3 text-xs text-muted-foreground mt-1">
         <span className="inline-flex items-center gap-1">