feat(fileDto, folderDto): add is_favorite + is_shared

- provide is_shared and is_favorite information in DTO, information propagated as badge/buttons per items
      regarding performances I try to be minimalis on SQL to prevent any perf regression

    - remove old set of sharedids and favoriteids (was not functionnal anymore)
    - fix date picker (no past selection) in grant
    - fix contextmenu close on /files section

frontend/src/lib/components/ShareDialog.test.ts

@@ -18,6 +18,7 @@ vi.mock('$lib/api/endpoints/grants', () => ({
 	fetchGrantsForResource: vi.fn(),
 	notifyGrantRecipient: vi.fn(),
 	revokeGrant: vi.fn(),
+	todayIso: () => '2026-07-22',
 	updateGrantRole: vi.fn()
 }));
 vi.mock('$lib/api/endpoints/recipients', () => ({