[mob] Show score if query contains score threshold

mobile/lib/models/file/file.dart

@@ -268,9 +268,11 @@ class EnteFile {
   }
 
   String? get caption {
-    return pubMagicMetadata?.caption;
+    return debugCaption ?? pubMagicMetadata?.caption;
   }
 
+  String? debugCaption;
+
   String get thumbnailUrl {
     if (localFileServer.isNotEmpty) {
       return "$localFileServer/thumb/$uploadedFileID";

mobile/lib/services/machine_learning/semantic_search/semantic_search_service.dart

@@ -144,12 +144,14 @@ class SemanticSearchService {
     String query, {
     double? scoreThreshold,
   }) async {
+    bool showScore = false;
     // if the query starts with 0.xxx, the split the query to get score threshold and actual query
     if (query.startsWith(RegExp(r"0\.\d+"))) {
       final parts = query.split(" ");
       if (parts.length > 1) {
         scoreThreshold = double.parse(parts[0]);
         query = parts.sublist(1).join(" ");
+        showScore = true;
       }
     }
     final textEmbedding = await _getTextEmbedding(query);
@@ -165,6 +167,11 @@ class SemanticSearchService {
       dev.log("Query: $query, Score: ${result.score}, index $i");
     }
 
+    final Map<int, double> fileIDToScoreMap = {};
+    for (final result in queryResults) {
+      fileIDToScoreMap[result.id] = result.score;
+    }
+
     final filesMap = await FilesDB.instance
         .getFilesFromIDs(queryResults.map((e) => e.id).toList());
 
@@ -177,8 +184,13 @@ class SemanticSearchService {
     for (final result in queryResults) {
       final file = filesMap[result.id];
       if (file != null && !ignoredCollections.contains(file.collectionID)) {
+        if (showScore) {
+          file.debugCaption =
+              "${fileIDToScoreMap[result.id]?.toStringAsFixed(3)}";
+        }
         results.add(file);
       }
+
       if (file == null) {
         deletedEntries.add(result.id);
       }

mobile/lib/ui/viewer/file/thumbnail_widget.dart

@@ -201,6 +201,8 @@ class _ThumbnailWidgetState extends State<ThumbnailWidget> {
       viewChildren.add(TrashedFileOverlayText(widget.file as TrashFile));
     } else if (GalleryContextState.of(context)?.type == GroupType.size) {
       viewChildren.add(FileSizeOverlayText(widget.file));
+    } else if (widget.file.debugCaption != null) {
+      viewChildren.add(FileOverlayText(widget.file.debugCaption!));
     }
     // todo: Move this icon overlay to the collection widget.
     if (widget.shouldShowArchiveStatus) {