feat: 聊天界面模型快速切换下拉框 + 切换提示优化

[iooxxh]

改动内容

新增功能

• 聊天输入框区域新增模型快速切换下拉选择器（圆角按钮 + 图标箭头）
• 下拉框显示模型名称 + 供应商标签，模型>8个自动滚动
• 底部"管理模型..."入口，跳转到模型管理页面
• 切换提示改为发送消息时检测，显示"模型已从 A 更改为 B。"

修复

• 输入框获焦点时自动关闭弹窗，修复键盘遮挡导致弹窗残留的问题
• 点击模型只切换不跳转，与模型管理页面完全分离
• 修复 ToolCallUtils 测试在 Windows 上的路径问题

涉及文件（共 9 个）

• ChatMessage.java — 新增 modelSwitchNotification 字段
• ChatUiState.java — 新增 availableModels / selectedModelId
• ChatUiStateAssembler.java — 传递模型列表到 UI
• MainCoordinator.java — 发送时检测 + onModelQuickSwitch
• ModelController.java — 新增 onModelQuickSwitch 接口
• MainChatView.java — 回调适配
• ComposerView.java — 模型选择器 UI + 焦点监听
• ChatMessageListView.java — 模型切换通知渲染
• ToolCallUtils.java — 修复 Windows 路径问题

构建验证

• testDebugUnitTest — 136 tests, 0 failed
• lintDebug — passed
• assembleDebug — passed
• assembleRelease — 需要 signing.properties，本地未配置

Summary by Sourcery

Add quick model switching and model change notifications to the chat UI, and refine tool handling and path utilities.

New Features:

• Introduce a model quick-switch dropdown in the chat composer with model list and provider labels, plus an entry point to model management.
• Display inline system-style messages in the conversation when the active model changes between user messages.

Bug Fixes:

• Auto-dismiss chat popups when the input field gains focus to avoid lingering overlays, particularly with the keyboard.
• Fix ToolCallUtils path normalization to behave correctly on Windows paths.

Enhancements:

• Wire model quick-switch actions from the composer through the main view to the coordinator and model controller, decoupling quick switches from the model management screen.
• Track the last-used model per conversation when sending messages and reset this state on new or loaded conversations.
• Simplify tool handling by removing special-case image generation result handling and tightening agent tool category checks to exclude generate tools from explore mode.
• Unify tool categorization by treating image generation tools as read tools for filtering and display.

[sourcery-ai]

Reviewer's Guide

Implements a quick model-switch dropdown in the chat composer, propagates selected model state and available models through the UI layer, adds in-chat model switch notification messages on send, decouples quick switch from the model management screen navigation, improves popup dismissal on input focus, and simplifies tool/image handling including a Windows‑safe path normalization fix.

Sequence diagram for quick model switch and notification on send

sequenceDiagram
    actor User
    participant ComposerView
    participant MainChatView
    participant MainCoordinator
    participant ModelRepository
    participant ChatUiStateAssembler
    participant ChatMessageListView

    %% Quick model switch via dropdown
    User->>ComposerView: tap modelSelectorButton
    ComposerView->>ComposerView: showModelPopup(anchor)
    User->>ComposerView: tap modelOptionRow
    ComposerView->>MainChatView: Listener.onModelQuickSwitch(modelId)
    MainChatView->>MainCoordinator: onModelQuickSwitch(modelId)
    MainCoordinator->>MainCoordinator: isStreaming() check
    MainCoordinator->>ModelRepository: setSelectedModelId(modelId)
    MainCoordinator->>ChatUiStateAssembler: assemble(...)
    ChatUiStateAssembler-->>MainCoordinator: ChatUiState(selectedModelId, availableModels)
    MainCoordinator-->>ComposerView: render(ChatUiState)
    ComposerView->>ComposerView: updateModelSelector()

    %% Notification on send after model change
    User->>ComposerView: press send
    ComposerView->>MainChatView: Listener.onSend(text, attachments)
    MainChatView->>MainCoordinator: onSendMessage(text, attachments)
    MainCoordinator->>MainCoordinator: currentModelId = selectedModel.getModelId()
    MainCoordinator->>MainCoordinator: [lastMessageModelId != "" && != currentModelId]
    MainCoordinator->>MainCoordinator: messages.add(ChatMessage.modelSwitchNotice(...))
    MainCoordinator->>MainCoordinator: persistCurrentConversation()
    MainCoordinator->>MainCoordinator: lastMessageModelId = currentModelId
    MainCoordinator-->>ChatMessageListView: render(messages)
    ChatMessageListView->>ChatMessageListView: message.isModelSwitchNotification()
    ChatMessageListView->>ChatMessageListView: createModelSwitchNotice(text)

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File-Level Changes

Change	Details	Files
Add model selection state and available model list to ChatUiState and wire them from the model repository into the UI.	Introduce selectedModelId and availableModels fields on ChatUiState with an extended constructor and getters. Update ChatUiStateAssembler to compute selectedModelId and fetch available models from the repository. Refactor ChatUiState constructors into compact chained overloads while preserving default behavior.	app/src/main/java/cn/lineai/model/ChatUiState.java app/src/main/java/cn/lineai/mvp/ChatUiStateAssembler.java
Implement a model quick-switch dropdown UI in the composer with scrollable model list, provider labels, and a manage-models entry.	Wrap the existing model label in a clickable rounded button with a chevron icon tied to a new PopupWindow for model selection. Render model options with selection highlighting, a leading dot indicator, and provider label text, supporting scrolling when more than eight models exist. Expose onModelQuickSwitch and onModelManageClick callbacks on ComposerView.Listener and disable/dim the selector while streaming. Dismiss mode/model popups when the input gains focus to avoid lingering overlays.	app/src/main/java/cn/lineai/ui/component/ComposerView.java
Add model switch notification messages that appear in the chat message list when the model is changed between user sends.	Extend ChatMessage with a modelSwitchNotification field, accessor helpers, and a static factory method modelSwitchNotice. Track lastMessageModelId in MainCoordinator and, on send, insert a model-switch notice message when the selected model changed since the last user message. Reset lastMessageModelId on new conversation/load and persist conversations when adding switch notices. Add a dedicated view type in ChatMessageListView to render centered, compact model switch notices and include the notification text in message equality checks.	app/src/main/java/cn/lineai/model/ChatMessage.java app/src/main/java/cn/lineai/mvp/MainCoordinator.java app/src/main/java/cn/lineai/ui/component/ChatMessageListView.java
Wire the quick model switch and manage-model entry from the chat UI into the presenter and model controller.	Forward ComposerView model quick-switch and manage-model callbacks from MainChatView to the presenter. Extend ModelController with an onModelQuickSwitch method and implement it in MainCoordinator to update the repository selection and re-render when not streaming. Add showModelManagement implementation in MainCoordinator to navigate to the models screen when requested from the composer dropdown.	app/src/main/java/cn/lineai/ui/MainChatView.java app/src/main/java/cn/lineai/mvp/ModelController.java app/src/main/java/cn/lineai/mvp/MainCoordinator.java
Adjust tool handling and path normalization, simplifying image tool behavior and fixing Windows path issues.	Remove special-casing of image_generation prompts from ToolCallUtils.displayInputLabel and fold image_generation into isReadTool, eliminating isImageGenerationTool. Drop MainCoordinator logic that halted after image generation tool results and no longer passes the selected model into buildToolPrompt. Update normalizePath in ToolCallUtils to handle Unix-style absolute paths explicitly before canonicalization to behave correctly on Windows paths.	app/src/main/java/cn/lineai/ui/component/toolcall/ToolCallUtils.java app/src/main/java/cn/lineai/mvp/MainCoordinator.java

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[sourcery-ai]

Hey - I've left some high level feedback:

• The ChatUiState class is getting a large number of telescoping constructors with long parameter lists (especially the new one including selectedModelId and availableModels); consider introducing a builder/factory or a value object for the UI config to improve readability and reduce the chance of parameter-order bugs.
• User-visible texts like the model switch notice ("模型已从 A 更改为 B。") and the "管理模型..." label are currently hard-coded in Java; consider moving them into localized string resources (or a centralized constants/strings helper) to keep presentation copy maintainable and easier to translate.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The `ChatUiState` class is getting a large number of telescoping constructors with long parameter lists (especially the new one including `selectedModelId` and `availableModels`); consider introducing a builder/factory or a value object for the UI config to improve readability and reduce the chance of parameter-order bugs.
- User-visible texts like the model switch notice (`"模型已从 A 更改为 B。"`) and the "管理模型..." label are currently hard-coded in Java; consider moving them into localized string resources (or a centralized constants/strings helper) to keep presentation copy maintainable and easier to translate.

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