feat: improve recent searches and tags visibility, deduplication and UI (v3.0.6)

lib/backend/repositories/search_repository.dart

@@ -12,6 +12,15 @@ class SearchRepository {
 
   Future<Result<void>> save(SearchHistory history, {int maxItems = 500}) {
     return _databaseService.safeWrite((isar) async {
+      final norm = history.query.trim().toLowerCase();
+      // Remove any existing duplicate records with same query
+      final all = await isar.searchHistoryEntitys.where().findAll();
+      for (final item in all) {
+        if (item.query.trim().toLowerCase() == norm) {
+          await isar.searchHistoryEntitys.delete(item.isarId);
+        }
+      }
+
       await isar.searchHistoryEntitys.put(
         SearchHistoryEntity()
           ..historyId = history.id
@@ -42,13 +51,40 @@ class SearchRepository {
     return _databaseService.safeRead((isar) async {
       final items = await isar.searchHistoryEntitys.where().findAll();
       items.sort((a, b) => b.searchedAt.compareTo(a.searchedAt));
-      final limited = limit == null ? items : items.take(limit);
+
+      final seen = <String>{};
+      final deduplicated = <SearchHistoryEntity>[];
+      for (final item in items) {
+        final key = item.query.trim().toLowerCase();
+        if (key.isEmpty) continue;
+        if (seen.add(key)) {
+          deduplicated.add(item);
+        }
+      }
+
+      final limited = limit == null ? deduplicated : deduplicated.take(limit);
       return limited.map((entity) => entity.toModel()).toList();
     });
   }
 
   Future<Result<bool>> delete(String historyId) {
     return _databaseService.safeWrite((isar) async {
+      final target = await isar.searchHistoryEntitys
+          .where()
+          .filter()
+          .historyIdEqualTo(historyId)
+          .findFirst();
+      if (target != null) {
+        final norm = target.query.trim().toLowerCase();
+        final all = await isar.searchHistoryEntitys.where().findAll();
+        for (final item in all) {
+          if (item.query.trim().toLowerCase() == norm ||
+              item.historyId == historyId) {
+            await isar.searchHistoryEntitys.delete(item.isarId);
+          }
+        }
+        return true;
+      }
       return await isar.searchHistoryEntitys.deleteByHistoryId(historyId);
     });
   }