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/ui/radial-menu.tsx

@@ -33,6 +33,13 @@ export function RadialMenu({
   const [activeIndex, setActiveIndex] = useState<number>(-1);
   const [animatingIn, setAnimatingIn] = useState(false);
   const menuRef = useRef<HTMLDivElement>(null);
+  const activeIndexRef = useRef(activeIndex);
+  const itemsRef = useRef(items);
+  const onCloseRef = useRef(onClose);
+
+  activeIndexRef.current = activeIndex;
+  itemsRef.current = items;
+  onCloseRef.current = onClose;
 
   useEffect(() => {
     setMounted(true);
@@ -51,45 +58,54 @@ export function RadialMenu({
     setActiveIndex(-1);
 
     const handleKeyDown = (e: KeyboardEvent) => {
+      const items = itemsRef.current;
+      const currentIndex = activeIndexRef.current;
+
       if (e.key === "Escape") {
         e.preventDefault();
-        onClose();
+        onCloseRef.current();
         return;
       }
-      if (e.key === "Enter" && activeIndex >= 0 && activeIndex < items.length) {
-        e.preventDefault();
-        const item = items[activeIndex];
-        if (!item.disabled) {
-          item.onClick();
-          onClose();
+      if (e.key === "Enter") {
+        if (currentIndex >= 0 && currentIndex < items.length) {
+          e.preventDefault();
+          const item = items[currentIndex];
+          if (!item.disabled) {
+            item.onClick();
+            onCloseRef.current();
+          }
         }
         return;
       }
       if (e.key === "ArrowRight" || e.key === "ArrowDown") {
         e.preventDefault();
         setActiveIndex((prev) => {
-          let next = prev + 1;
-          if (next >= items.length) next = 0;
+          const hasEnabledItem = items.some((item) => !item.disabled);
+          if (!hasEnabledItem) return -1;
+
+          let next = prev;
           let loops = 0;
-          while (items[next]?.disabled && loops < items.length) {
+          do {
             next = next + 1 >= items.length ? 0 : next + 1;
             loops++;
-          }
-          return next;
+          } while (items[next]?.disabled && loops < items.length);
+          return items[next]?.disabled ? -1 : next;
         });
         return;
       }
       if (e.key === "ArrowLeft" || e.key === "ArrowUp") {
         e.preventDefault();
         setActiveIndex((prev) => {
-          let next = prev - 1;
-          if (next < 0) next = items.length - 1;
+          const hasEnabledItem = items.some((item) => !item.disabled);
+          if (!hasEnabledItem) return -1;
+
+          let next = prev;
           let loops = 0;
-          while (items[next]?.disabled && loops < items.length) {
+          do {
             next = next - 1 < 0 ? items.length - 1 : next - 1;
             loops++;
-          }
-          return next;
+          } while (items[next]?.disabled && loops < items.length);
+          return items[next]?.disabled ? -1 : next;
         });
         return;
       }
@@ -97,7 +113,7 @@ export function RadialMenu({
 
     document.addEventListener("keydown", handleKeyDown);
     return () => document.removeEventListener("keydown", handleKeyDown);
-  }, [isOpen, activeIndex, items, onClose]);
+  }, [isOpen]);
 
   const radius = size / 2 - 28;
   const center = size / 2;