♻️ Decouple the room.dart

lib/widgets/chat/room_selection_mode.dart

@@ -0,0 +1,54 @@
+import 'package:flutter/material.dart';
+import 'package:material_symbols_icons/material_symbols_icons.dart';
+import 'package:material_symbols_icons/symbols.dart';
+
+class RoomSelectionMode extends StatelessWidget {
+  final bool visible;
+  final int selectedCount;
+  final VoidCallback onClose;
+  final VoidCallback onAIThink;
+
+  const RoomSelectionMode({
+    super.key,
+    required this.visible,
+    required this.selectedCount,
+    required this.onClose,
+    required this.onAIThink,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    if (!visible) return const SizedBox.shrink();
+
+    return Container(
+      color: Theme.of(context).colorScheme.surface,
+      padding: EdgeInsets.only(
+        left: 16,
+        right: 16,
+        top: 8,
+        bottom: MediaQuery.of(context).padding.bottom + 8,
+      ),
+      child: Row(
+        children: [
+          IconButton(
+            icon: const Icon(Icons.close),
+            onPressed: onClose,
+            tooltip: 'Cancel selection',
+          ),
+          const SizedBox(width: 8),
+          Text(
+            '$selectedCount selected',
+            style: Theme.of(context).textTheme.titleMedium,
+          ),
+          const Spacer(),
+          if (selectedCount > 0)
+            FilledButton.icon(
+              onPressed: onAIThink,
+              icon: const Icon(Symbols.smart_toy),
+              label: const Text('AI Think'),
+            ),
+        ],
+      ),
+    );
+  }
+}