feat(SearchLocal, locate-db, webdav): implement scan cancellation with AbortController and enhance progress tracking

src/app/components/SearchLocal.tsx

@@ -166,7 +166,8 @@ function FilterChips({
 }
 
 export default function SearchLocal({ config, setConfig, onClose, onOpenFolder }: SearchLocalProps) {
-  const scrollRef = useRef<HTMLDivElement>(null);
+  const scrollRef    = useRef<HTMLDivElement>(null);
+  const scanAbortRef = useRef<AbortController | null>(null);
   const [query, setQuery] = useState(() => _store.query);
   const [isSearching, setIsSearching] = useState(false);
   const [isScanning, setIsScanning] = useState(false);
@@ -214,6 +215,10 @@ export default function SearchLocal({ config, setConfig, onClose, onOpenFolder }
     }
   }, []);
 
+  useEffect(() => {
+    return () => { scanAbortRef.current?.abort(); };
+  }, []);
+
   const mountedPaths = useMemo(() => {
     const paths = new Set<string>();
     for (const d of Object.values(config?.devices?.iec ?? {})) {
@@ -267,24 +272,32 @@ export default function SearchLocal({ config, setConfig, onClose, onOpenFolder }
   };
 
   const handleScan = async () => {
+    const controller = new AbortController();
+    scanAbortRef.current = controller;
     setIsScanning(true);
     setScanPhase('scanning');
     setScanValue(0);
     try {
-      const { count, bytes } = await buildLocateDb((phase, value, path) =>
-        flushSync(() => { setScanPhase(phase); setScanValue(value); if (path !== undefined) setScanPath(path); })
+      const { count, bytes } = await buildLocateDb(
+        (phase, value, path) =>
+          flushSync(() => { setScanPhase(phase); setScanValue(value); if (path !== undefined) setScanPath(path); }),
+        controller.signal,
       );
       toast.success(`Indexed ${count.toLocaleString()} items · ${humanFileSize(bytes)}`);
       setDbPhase('ready');
     } catch (e: any) {
-      toast.error(`Scan failed: ${e?.message ?? e}`);
+      if (e?.name === 'AbortError') toast.info('Scan stopped.');
+      else toast.error(`Scan failed: ${e?.message ?? e}`);
     } finally {
+      scanAbortRef.current = null;
       setIsScanning(false);
       setScanPhase(null);
       setScanPath(null);
     }
   };
 
+  const handleStopScan = () => scanAbortRef.current?.abort();
+
   const handleRefreshDb = () => {
     resetLocateDb();
     setDbPhase('idle');
@@ -459,6 +472,12 @@ export default function SearchLocal({ config, setConfig, onClose, onOpenFolder }
               ) : (
                 <p className="text-xs text-neutral-400">Scanning /sd recursively…</p>
               )}
+              <button
+                onClick={handleStopScan}
+                className="mt-2 px-4 py-1.5 text-xs font-medium rounded-lg border border-neutral-300 text-neutral-600 hover:bg-neutral-100 transition-colors"
+              >
+                Stop
+              </button>
             </div>
           )}
 

src/app/locate-db.ts

@@ -175,14 +175,18 @@ export type ScanPhase = 'scanning' | 'building' | 'saving' | 'compressing';
  */
 export async function buildLocateDb(
   onProgress?: (phase: ScanPhase, value: number, path?: string) => void,
+  signal?: AbortSignal,
 ): Promise<{ count: number; bytes: number }> {
+  signal?.throwIfAborted();
   const sqlite3 = await getSqlite3();
 
   // ── 1. Recursive PROPFIND on /sd ────────────────────────────────────────
   const entries = await listDirectory(
     '/sd', true,
     bytes => onProgress?.('scanning', bytes),
+    signal,
   );
+  signal?.throwIfAborted();
 
   // ── 2. Build in-memory DB ───────────────────────────────────────────────
   const db = new sqlite3.oo1.DB(':memory:', 'ct');
@@ -207,12 +211,16 @@ export async function buildLocateDb(
         e.lastModified ? Math.floor(e.lastModified.getTime() / 1000) : 0,
         e.type === 'folder' ? 1 : 0,
       ]).stepReset();
-      if (i % SCAN_PROGRESS_INTERVAL === 0) onProgress?.('building', i, e.path);
+      if (i % SCAN_PROGRESS_INTERVAL === 0) {
+        signal?.throwIfAborted();
+        onProgress?.('building', i, e.path);
+      }
     }
   } finally {
     stmt.finalize();
   }
   db.exec('COMMIT');
+  signal?.throwIfAborted();
   onProgress?.('building', entries.length);
 
   // ── 3. Serialize to bytes ────────────────────────────────────────────────

src/app/webdav.ts

@@ -175,6 +175,7 @@ export async function listDirectory(
   path: string,
   recursive = false,
   onProgress?: (bytes: number) => void,
+  signal?: AbortSignal,
 ): Promise<EntryInfo[]> {
   const manager = getWebDAVClient();
   const base = manager.client.baseUrl;
@@ -190,6 +191,7 @@ export async function listDirectory(
       method: 'PROPFIND',
       headers: { 'Depth': String(depth), 'Content-Type': 'text/xml; charset=utf-8' },
       body: PROPFIND_LIST_BODY,
+      signal,
     });
     if (!response.body) throw new Error('No response body');
     const reader = response.body.getReader();