fix(chat): chat input layout with prompt overlay

lib/features/chat/widgets/modern_chat_input.dart

@@ -1067,7 +1067,8 @@ class _ModernChatInputState extends ConsumerState<ModernChatInput>
           f.status == FileUploadStatus.uploading ||
           f.status == FileUploadStatus.pending,
     );
-    final allUploadsComplete = attachedFiles.isEmpty ||
+    final allUploadsComplete =
+        attachedFiles.isEmpty ||
         attachedFiles.every((f) => f.status == FileUploadStatus.completed);
 
     final webSearchEnabled = ref.watch(webSearchEnabledProvider);
@@ -1410,7 +1411,16 @@ class _ModernChatInputState extends ConsumerState<ModernChatInput>
           Spacing.screenPadding,
           bottomPadding + Spacing.md,
         ),
-        child: Row(
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            // Show prompt overlay above the compact input row when active
+            if (_showPromptOverlay)
+              Padding(
+                padding: const EdgeInsets.only(bottom: Spacing.xs),
+                child: _buildPromptOverlay(context),
+              ),
+            Row(
               crossAxisAlignment: CrossAxisAlignment.end,
               children: [
                 _buildOverflowButton(
@@ -1433,6 +1443,8 @@ class _ModernChatInputState extends ConsumerState<ModernChatInput>
                 ),
               ],
             ),
+          ],
+        ),
       );
     }