fix(duplicates): use server-side path filter instead of client-side filtering

Move basePath filtering from client-side startsWith check to server-side
query filter (path:basePath*) for consistency with map implementation
and improved efficiency. Reduces amount of data fetched when user has
a basePath configured.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

web/src/lib/services/adapters/duplicates.ts

@@ -25,23 +25,18 @@ export interface DuplicateGroup {
 }
 
 export async function listDuplicateGroups(basePath?: string): Promise<DuplicateGroup[]> {
+	// Build query: stack:true + optional path filter
+	const pathFilter = basePath ? ` path:${basePath}*` : '';
+	const q = `stack:true${pathFilter}`;
+
 	const photos = await listPhotos({
-		q: 'stack:true',
+		q,
 		count: 200,
 		merged: true,
 		order: 'newest'
 	});
 	return photos
-		.filter((p) => {
-			// Filter out photos not in the current user's base path
-			if (basePath) {
-				const photoPath = p.Path ?? '';
-				if (!photoPath.startsWith(basePath)) {
-					return false;
-				}
-			}
-			return (p.Files?.length ?? 0) > 1;
-		})
+		.filter((p) => (p.Files?.length ?? 0) > 1)
 		.map((p) => {
 			const files = p.Files ?? [];
 			const primary = files.find((f) => f.Primary) ?? files[0];