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/resource-picker.tsx

@@ -4,6 +4,7 @@ import { useState, useEffect, useMemo } from "react";
 import { useTranslations } from "next-intl";
 import { cn } from "@/lib/utils";
 import { Input } from "@/components/ui/input";
+import { apiFetch } from "@/lib/browser-navigation";
 import { useResourceStore } from "@/stores/resource-store";
 import type { Resource } from "@/lib/resources/client";
 import {
@@ -72,7 +73,6 @@ export function ResourcePicker({ start, end, compact = false }: ResourcePickerPr
       for (const resource of filtered) {
         try {
           const params = new URLSearchParams({ start, end });
-          const { apiFetch } = await import("@/lib/browser-navigation");
           const res = await apiFetch(
             `/api/resources/${resource.id}/availability?${params.toString()}`
           );
@@ -130,11 +130,12 @@ export function ResourcePicker({ start, end, compact = false }: ResourcePickerPr
           onChange={(e) => setQuery(e.target.value)}
           placeholder={t("resources.search_placeholder")}
           className="pl-8"
+          aria-label="Search resources"
         />
       </div>
 
       {isLoading ? (
-        <div className="flex items-center justify-center py-8">
+        <div className="flex items-center justify-center py-8" role="status" aria-label="Loading resources">
           <div className="animate-spin w-5 h-5 border-2 border-primary border-t-transparent rounded-full" />
         </div>
       ) : filtered.length === 0 ? (