feat: 添加首页图片选择功能（拍照/相册）

apps/lib/features/home/ui/screens/home_screen.dart

@@ -3,6 +3,7 @@ import 'dart:io';
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:go_router/go_router.dart';
+import 'package:image_picker/image_picker.dart';
 import 'package:lucide_icons/lucide_icons.dart';
 import '../../../../core/api/api_exception.dart';
 import '../../../../core/di/injection.dart';
@@ -73,6 +74,7 @@ class _HomeScreenState extends State<HomeScreen>
   bool _isRecording = false;
   bool _isTranscribing = false;
   int _unreadCount = 0;
+  final List<XFile> _selectedImages = [];
 
   bool get _hasMessage => _messageController.text.trim().isNotEmpty;
 
@@ -154,6 +156,7 @@ class _HomeScreenState extends State<HomeScreen>
                 children: [
                   _buildHeader(context),
                   Expanded(child: _buildChatArea(context, state)),
+                  _buildImagePreview(),
                   _buildInputContainer(context, state),
                 ],
               ),
@@ -515,6 +518,71 @@ class _HomeScreenState extends State<HomeScreen>
     return UiSchemaRenderer.render(item.uiCard);
   }
 
+  Widget _buildImagePreview() {
+    if (_selectedImages.isEmpty) {
+      return const SizedBox.shrink();
+    }
+
+    return Padding(
+      padding: const EdgeInsets.only(
+        left: _inputPadding,
+        right: _inputPadding,
+        bottom: AppSpacing.sm,
+      ),
+      child: Wrap(
+        spacing: AppSpacing.sm,
+        runSpacing: AppSpacing.sm,
+        children: _selectedImages.asMap().entries.map((entry) {
+          final index = entry.key;
+          final image = entry.value;
+          return _buildImageThumbnail(image, index);
+        }).toList(),
+      ),
+    );
+  }
+
+  Widget _buildImageThumbnail(XFile image, int index) {
+    return Stack(
+      children: [
+        ClipRRect(
+          borderRadius: BorderRadius.circular(AppRadius.md),
+          child: Image.file(
+            File(image.path),
+            width: 80,
+            height: 80,
+            fit: BoxFit.cover,
+          ),
+        ),
+        Positioned(
+          top: 4,
+          right: 4,
+          child: GestureDetector(
+            onTap: () => _removeImage(index),
+            child: Container(
+              width: 24,
+              height: 24,
+              decoration: const BoxDecoration(
+                color: AppColors.red500,
+                shape: BoxShape.circle,
+              ),
+              child: const Icon(
+                LucideIcons.x,
+                size: 14,
+                color: AppColors.white,
+              ),
+            ),
+          ),
+        ),
+      ],
+    );
+  }
+
+  void _removeImage(int index) {
+    setState(() {
+      _selectedImages.removeAt(index);
+    });
+  }
+
   Widget _buildInputContainer(BuildContext context, ChatState state) {
     final isWaitingAgent =
         state.isWaitingFirstToken || state.isStreaming || state.isCancelling;
@@ -625,10 +693,17 @@ class _HomeScreenState extends State<HomeScreen>
 
   Future<void> _sendMessage(BuildContext context) async {
     final content = _messageController.text.trim();
-    if (content.isEmpty) return;
+    if (content.isEmpty && _selectedImages.isEmpty) return;
+
+    final images = List<XFile>.from(_selectedImages);
+
     FocusScope.of(context).unfocus();
     _messageController.clear();
-    await context.read<ChatBloc>().sendMessage(content);
+    setState(() {
+      _selectedImages.clear();
+    });
+
+    await context.read<ChatBloc>().sendMessage(content, images: images);
 
     WidgetsBinding.instance.addPostFrameCallback((_) {
       if (_scrollController.hasClients) {
@@ -814,7 +889,16 @@ class _HomeScreenState extends State<HomeScreen>
       context: context,
       backgroundColor: Colors.transparent,
       isScrollControlled: true,
-      builder: (context) => const HomeSheet(),
+      builder: (context) => HomeSheet(
+        onImagesSelected: (images) {
+          setState(() {
+            final remaining = 3 - _selectedImages.length;
+            if (remaining > 0) {
+              _selectedImages.addAll(images.take(remaining));
+            }
+          });
+        },
+      ),
     );
   }
 }