feat: pull to refresh on chat drawer

lib/features/navigation/widgets/chats_drawer.dart

@@ -41,6 +41,74 @@ class _ChatsDrawerState extends ConsumerState<ChatsDrawer> {
     (ref) => {},
   );
 
+  Future<void> _refreshChats() async {
+    try {
+      // Always refresh folders
+      ref.invalidate(foldersProvider);
+
+      if (_query.trim().isEmpty) {
+        // Refresh main conversations list
+        ref.invalidate(conversationsProvider);
+        try {
+          await ref.read(conversationsProvider.future);
+        } catch (_) {}
+      } else {
+        // Refresh server-side search results
+        ref.invalidate(serverSearchProvider(_query));
+        try {
+          await ref.read(serverSearchProvider(_query).future);
+        } catch (_) {}
+      }
+
+      // Await folders as well so the list stabilizes
+      try {
+        await ref.read(foldersProvider.future);
+      } catch (_) {}
+    } catch (_) {}
+  }
+
+  Widget _buildRefreshableScrollable({required List<Widget> children}) {
+    // Common padding used in both scrollable variants
+    const padding = EdgeInsets.fromLTRB(
+      Spacing.md,
+      Spacing.sm,
+      Spacing.md,
+      Spacing.md,
+    );
+
+    if (Platform.isIOS) {
+      // Use Cupertino-style pull-to-refresh on iOS
+      final scroll = CustomScrollView(
+        controller: _listController,
+        physics: const AlwaysScrollableScrollPhysics(),
+        slivers: [
+          const CupertinoSliverRefreshControl(),
+          SliverPadding(
+            padding: padding,
+            sliver: SliverList(
+              delegate: SliverChildListDelegate(children),
+            ),
+          ),
+        ],
+      );
+      return CupertinoScrollbar(controller: _listController, child: scroll);
+    }
+
+    // Material pull-to-refresh elsewhere
+    return RefreshIndicator(
+      onRefresh: _refreshChats,
+      child: Scrollbar(
+        controller: _listController,
+        child: ListView(
+          controller: _listController,
+          physics: const AlwaysScrollableScrollPhysics(),
+          padding: padding,
+          children: children,
+        ),
+      ),
+    );
+  }
+
   @override
   void dispose() {
     _debounce?.cancel();
@@ -226,17 +294,7 @@ class _ChatsDrawerState extends ConsumerState<ChatsDrawer> {
 
           final archived = list.where((c) => c.archived == true).toList();
 
-          return Scrollbar(
+          final children = <Widget>[
-            controller: _listController,
-            child: ListView(
-              controller: _listController,
-              padding: const EdgeInsets.fromLTRB(
-                Spacing.md,
-                Spacing.sm,
-                Spacing.md,
-                Spacing.md,
-              ),
-              children: [
             if (pinned.isNotEmpty) ...[
               _buildSectionHeader(
                 AppLocalizations.of(context)!.pinned,
@@ -312,9 +370,8 @@ class _ChatsDrawerState extends ConsumerState<ChatsDrawer> {
               const SizedBox(height: Spacing.md),
               _buildArchivedSection(archived),
             ],
-              ],
+          ];
-            ),
+          return _buildRefreshableScrollable(children: children);
-          );
         },
         loading: () =>
             const Center(child: CircularProgressIndicator(strokeWidth: 2.0)),
@@ -377,17 +434,7 @@ class _ChatsDrawerState extends ConsumerState<ChatsDrawer> {
 
         final archived = list.where((c) => c.archived == true).toList();
 
-        return Scrollbar(
+        final children = <Widget>[
-          controller: _listController,
-          child: ListView(
-            controller: _listController,
-            padding: const EdgeInsets.fromLTRB(
-              Spacing.md,
-              Spacing.sm,
-              Spacing.md,
-              Spacing.md,
-            ),
-            children: [
           _buildSectionHeader('Results', list.length),
           const SizedBox(height: Spacing.xs),
           if (pinned.isNotEmpty) ...[
@@ -458,9 +505,8 @@ class _ChatsDrawerState extends ConsumerState<ChatsDrawer> {
             const SizedBox(height: Spacing.md),
             _buildArchivedSection(archived),
           ],
-            ],
+        ];
-          ),
+        return _buildRefreshableScrollable(children: children);
-        );
       },
       loading: () =>
           const Center(child: CircularProgressIndicator(strokeWidth: 2.0)),