feat: 更新CreateFeedFeature和CreateFeedView以增强发布功能

- 修改发布逻辑，允许在内容为空时仍可发布图片，提升用户灵活性。
- 更新错误提示信息，明确用户需要输入内容或选择图片。
- 调整发布按钮显示逻辑，仅在键盘隐藏时显示，优化界面布局。
- 增加工具栏标题，提升用户界面友好性。
- 优化发布按钮样式，增加圆角和渐变背景，提升视觉效果。

yana/Features/CreateFeedFeature.swift

@@ -16,7 +16,7 @@ struct CreateFeedFeature {
             processedImages.count < 9
         }
         var canPublish: Bool {
-            !content.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty && !isLoading
+            (!content.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty || !processedImages.isEmpty) && !isLoading
         }
         var isLoading: Bool = false
         
@@ -108,7 +108,7 @@ struct CreateFeedFeature {
                 
             case .publishButtonTapped:
                 guard state.canPublish else {
-                    state.errorMessage = "请输入内容"
+                    state.errorMessage = "请输入内容或选择图片"
                     return .none
                 }
                 
@@ -203,7 +203,7 @@ struct CreateFeedFeature {
                         let userId = await UserInfoManager.getCurrentUserId() ?? ""
                         let type = resList.isEmpty ? "0" : "2" // 0: 纯文字, 2: 图片
                         let request = await PublishFeedRequest.make(
-                            content: content,
+                            content: content.isEmpty ? "" : content,
                             uid: userId,
                             type: type,
                             resList: resList.isEmpty ? nil : resList

yana/Views/CreateFeedView.swift

@@ -22,9 +22,6 @@ struct CreateFeedView: View {
                                 ContentInputSection(store: store, isFocused: $isTextEditorFocused)
                                 ImageSelectionSection(store: store)
                                 LoadingAndErrorSection(store: store)
-                                
-                                // 底部间距
-    //                            Color.clear.frame(height: geometry.safeAreaInsets.bottom + 100)
                                 Spacer()
                             }
                             .frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .top)
@@ -32,9 +29,10 @@ struct CreateFeedView: View {
                             .background(Color(hex: 0x0C0527))
                         }
                         
-                        // 底部发布按钮 - 始终显示
-                        PublishButtonSection(store: store, geometry: geometry, isFocused: $isTextEditorFocused)
-                        
+                        // 底部发布按钮 - 只在键盘隐藏时显示
+                        if !isKeyboardVisible {
+                            PublishButtonSection(store: store, geometry: geometry, isFocused: $isTextEditorFocused)
+                        }
                     }
                     .onTapGesture {
                         isTextEditorFocused = false // 点击空白处收起键盘
@@ -55,6 +53,12 @@ struct CreateFeedView: View {
                         }
                     }
                     
+                    ToolbarItem(placement: .principal) {
+                        Text(NSLocalizedString("createFeed.title", comment: "Image & Text Publish"))
+                            .font(.system(size: 18, weight: .medium))
+                            .foregroundColor(.white)
+                    }
+                    
                     // 右上角发布按钮 - 只在键盘显示时出现
                     ToolbarItem(placement: .navigationBarTrailing) {
                         if isKeyboardVisible {
@@ -69,9 +73,22 @@ struct CreateFeedView: View {
                                             .scaleEffect(0.7)
                                     }
                                     Text(toolbarButtonText)
-                                        .font(.system(size: 16, weight: .medium))
+                                        .font(.system(size: 14, weight: .medium))
                                         .foregroundColor(.white)
                                 }
+                                .padding(.horizontal, 12)
+                                .padding(.vertical, 8)
+                                .background(
+                                    LinearGradient(
+                                        gradient: Gradient(colors: [
+                                            Color(hex: 0xF854FC),
+                                            Color(hex: 0x500FFF)
+                                        ]),
+                                        startPoint: .leading,
+                                        endPoint: .trailing
+                                    )
+                                )
+                                .cornerRadius(16)
                             }
                             .disabled(store.isLoading || store.isUploadingImages || !store.canPublish)
                             .opacity(toolbarButtonOpacity)
@@ -250,7 +267,7 @@ struct PublishButtonSection: View {
     @FocusState.Binding var isFocused: Bool
     
     var body: some View {
-        VStack {
+        VStack(spacing: 0) {
             Button(action: {
                 isFocused = false // 收起键盘
                 store.send(.publishButtonTapped)
@@ -286,7 +303,7 @@ struct PublishButtonSection: View {
                 .opacity(buttonOpacity)
             }
             .padding(.horizontal, 16)
-            .padding(.bottom, geometry.safeAreaInsets.bottom + 20)
+            .padding(.bottom, 20) // 使用固定间距，不受键盘影响
         }
         .background(Color(hex: 0x0C0527))
     }