fix(server): compare integrity paths independently of unicode normalization (#31102)

* fix(server): compare integrity paths independently of unicode normalization

The untracked-file check compared on-disk paths against the database
byte for byte. macOS writes decomposed (NFD) filenames while an upload
stores the composed (NFC) form, so every asset with a non-ASCII name
came back from getAssetPathsByPaths under a different byte sequence,
was never removed from the candidate set, and was reported as an
untracked file. One reporter saw 14k false positives on a 55k library.

Look the batch up under both normal forms and key the comparison on
NFC, so a path that differs only in normalization is recognised as
tracked.

* test(server): cover normalized integrity lookup

server/src/services/integrity.service.spec.ts

@@ -13,6 +13,35 @@ describe(IntegrityService.name, () => {
     expect(sut).toBeDefined();
   });
 
+  describe('handleUntrackedFiles', () => {
+    const decomposedPath = '/data/upload/upload/user-id/Cafe\u{301}.jpg';
+    const composedPath = '/data/upload/upload/user-id/Caf\u{E9}.jpg';
+
+    beforeEach(() => {
+      mocks.integrityReport.getAssetPathsByPaths.mockResolvedValue([]);
+      mocks.integrityReport.getPersonThumbnailPathsByPaths.mockResolvedValue([]);
+    });
+
+    it.each([
+      { scannedPath: decomposedPath, storedPath: composedPath },
+      { scannedPath: composedPath, storedPath: decomposedPath },
+    ])(
+      'should not report a tracked asset whose path differs only by unicode normalization',
+      async ({ scannedPath, storedPath }) => {
+        mocks.integrityReport.getAssetPathsByPaths.mockResolvedValue([
+          { originalPath: storedPath, encodedVideoPath: null },
+        ]);
+
+        await sut.handleUntrackedFiles({ type: 'asset', paths: [scannedPath] });
+
+        expect(mocks.integrityReport.getAssetPathsByPaths).toHaveBeenCalledWith(
+          expect.arrayContaining([decomposedPath, composedPath]),
+        );
+        expect(mocks.integrityReport.create).not.toHaveBeenCalled();
+      },
+    );
+  });
+
   describe('handleUntrackedRefresh', () => {
     beforeEach(() => {
       mocks.integrityReport.getTrackedPaths.mockResolvedValue([]);

server/src/services/integrity.service.ts

@@ -275,38 +275,42 @@ export class IntegrityService extends BaseService {
   async handleUntrackedFiles({ type, paths }: IIntegrityUntrackedFilesJob): Promise<JobStatus> {
     this.logger.log(`Processing batch of ${paths.length} files to check if they are untracked.`);
 
-    const untrackedFiles = new Set<string>(paths);
+    const lookupPaths = [...new Set(paths.flatMap((path) => [path, path.normalize('NFC'), path.normalize('NFD')]))];
+
+    const trackedPaths = new Set<string>();
     if (type === 'asset') {
-      const assets = await this.integrityRepository.getAssetPathsByPaths(paths);
+      const assets = await this.integrityRepository.getAssetPathsByPaths(lookupPaths);
       for (const { originalPath, encodedVideoPath } of assets) {
-        untrackedFiles.delete(originalPath);
+        trackedPaths.add(originalPath.normalize('NFC'));
 
         if (encodedVideoPath) {
-          untrackedFiles.delete(encodedVideoPath);
+          trackedPaths.add(encodedVideoPath.normalize('NFC'));
         }
       }
     } else {
-      const assets = await this.integrityRepository.getAssetFilePathsByPaths(paths);
+      const assets = await this.integrityRepository.getAssetFilePathsByPaths(lookupPaths);
       for (const { path } of assets) {
-        untrackedFiles.delete(path);
+        trackedPaths.add(path.normalize('NFC'));
       }
     }
 
-    const personThumbnailPaths = await this.integrityRepository.getPersonThumbnailPathsByPaths(paths);
+    const personThumbnailPaths = await this.integrityRepository.getPersonThumbnailPathsByPaths(lookupPaths);
     for (const { thumbnailPath } of personThumbnailPaths) {
-      untrackedFiles.delete(thumbnailPath);
+      trackedPaths.add(thumbnailPath.normalize('NFC'));
     }
 
-    if (untrackedFiles.size > 0) {
+    const untrackedFiles = [...new Set(paths)].filter((path) => !trackedPaths.has(path.normalize('NFC')));
+
+    if (untrackedFiles.length > 0) {
       await this.integrityRepository.create(
-        [...untrackedFiles].map((path) => ({
+        untrackedFiles.map((path) => ({
           type: IntegrityReport.UntrackedFile,
           path,
         })),
       );
     }
 
-    this.logger.log(`Processed ${paths.length} and found ${untrackedFiles.size} untracked file(s).`);
+    this.logger.log(`Processed ${paths.length} and found ${untrackedFiles.length} untracked file(s).`);
     return JobStatus.Success;
   }