feat(ui): Phase 2 C1 — MainWindow + Sidebar + 颜色/主题系统
完成 AGENTS.md §57 Phase 2 的前 3 项：MainWindow 布局、Sidebar、Dark 主题
基础。剩余的 Message list / Empty state / Settings / Light-Switch /
Window state 留到 C2 / C3。
技术栈变化
----------
本次最大的工程变化是把 Slint UI 从 `slint!{}` macro 内嵌迁到独立
`.slint` 文件 + build.rs 编译：
ui/app.slint MainWindow + Sidebar 骨架（Phase 2 C1 完整实现）
ui/theme.slint export enum AppearanceMode { System, Light, Dark }
（不再有 export global Theme / Palette，见下文）
ui/components.slint NavItem / SectionLabel / Divider（Dark 默认颜色）
ui/message-card.slint 占位 stub（C2 实现）
ui/message-list.slint 占位 stub（C2 实现）
ui/empty-state.slint 占位 stub（C2 实现）
ui/settings-page.slint 占位 stub（C3 实现）
ui/server-card.slint 占位 stub（C3 实现）
ui/dialogs.slint 占位 stub（C3 实现）
build.rs slint_build::compile("ui/app.slint")，
把生成的 .rs 路径写入 SLINT_INCLUDE_GENERATED
src/lib.rs `slint::include_modules!()` 引入编译产物；
`MainWindow::new()` 拿 UI 实例；
`ui.set_theme(AppearanceMode::Dark)` 初始化
（C3 改成从 state.json 读 + 监听用户切换）
为什么不用 `include_slint!` —— 那是 `slint_interpreter` crate 提供的
API，不在 `slint` 1.18 主 crate 里。官方推荐的"build-time precompile"
路线是 `slint_build::compile()` + `slint::include_modules!()`，文档明确
写了这一步。
为什么不用 export global Palette / Theme
---------------------------------------
最初一版我把 Theme + Palette 都做成 `export global`，期望从 Rust 端
用 `ui.global::<Theme>().set_appearance(...)` 切换 Light/Dark。失败
了：slint-build 1.18 在生成 Rust 代码时把这两个 global 都 dead-code
消除了，generated 的 pub use 列表里只剩 `MainWindow` 和
`SidebarSelection`。原因——global 的所有 binding 在编译期都被简化为
常量（Theme.appearance 默认 Dark，Palette.background 绑定直接 inline 成
`#1f2024`），没有任何 dynamic 引用保留 global 的符号表。
解决方案：把 Theme + Palette 全部搬到 MainWindow 上作为 out properties，
由 `MainWindow.theme` 触发 binding 重新计算。Rust 端用
`ui.set_theme(AppearanceMode::Light)` 切。代价是 sidebar 的 NavItem
暂时只有 Dark 默认色（fixed `#2f3035` 等），Light theme 在 C3 通过
property forwarding 扩展 NavItem 时补齐——这是 C1 阶段明确接受的折衷。
这一节值得写进 commit 而不是悄悄改掉——后面任何看到代码的人都会好奇
"为什么 palette 不直接 export global？"，是这个原因。下次有 Phase 3+ 的人
碰这块也省得踩同样的坑。
Slint 版本对齐
--------------
之前 commit 时钉过 `slint = "1"`（让 cargo 选最新 1.x 稳定版），现在
slint-build 1.18.0 引入 build-deps：`slint-build`, `i-slint-compiler` 等。
两者锁到同一个 1.18.0 版本是 Slint 自身的 forward-compat 约束
（slint-build 的 `compat-1-18` feature 在 build.rs 启动时强校验）。
MainWindow / Sidebar 布局细节
-----------------------------
按 AGENTS.md §6 / §7：
- 960×680 preferred，760×520 min —— Slint 1.18 不允许同时设
`width` + `min-width`，用 `preferred-width`/`preferred-height` 替代
（之前第一次 build 报 `Cannot specify both 'width' and 'min-width'`，
这里记录一下）。
- 232px sidebar 宽，含 AGENTS.md §7 列出的 6 个 section
（logo + All + Servers 占位 + Filters 三个 + Settings + About）
- SidebarSelection enum 驱动右侧 view-switcher，三个 view 都有占位
文字（Messages / Settings / About），C2 / C3 替换实际内容
- AGENTS.md §52 颜色 token 全部按 dark / light 两套列出，由
`MainWindow.is-dark` 派生；优先级颜色（§7 message card）也按
§7 Low/Normal/High/Max 映射
未做（按计划归到后续 commit）
------------------------------
C2:
- src/models.rs（MessageItem + Priority enum，AGENTS.md §34）
- src/mock.rs（生成 10 条 mock 消息）
- ui/message-card.slint 真实内容
- ui/message-list.slint 真实内容（ListView 接 Rust Model adapter）
- ui/empty-state.slint 真实内容（§9 "You're all caught up" + ✦ + Test button）
- main 区 if-switch 真正根据 list.is_empty 选 list / empty-state
C3:
- src/storage/* —— 持久化 state.json
- ui/settings-page.slint 真实内容（§10 五个分组 + Advanced 折叠）
- ui/server-card.slint 真实内容
- ui/dialogs.slint 真实内容（About + confirm）
- sidebar NavItem 接 palette forwarding，Light theme 真的换 sidebar 颜色
- 主题切到 Light/System 实时生效（System 跟随 Windows 主题）
验证
----
cargo build exit 0, 5.10s（增量）
cargo build --release exit 0（slint + skia + accesskit 全重编，约 8 分钟）
warnings 0
debug .exe 26.01 MB, subsystem = 3 (WINDOWS_CUI / console)
release .exe 7.87 MB, subsystem = 2 (WINDOWS_GUI)
Phase 2 C1 验收：能在 Windows 上打开 MainWindow（960×680、Dark、含完整
Sidebar），通过 release profile 的 WINDOWS_GUI subsystem 验证无 console。
Sidebar 切换 Settings/About 时右侧文案占位更新——C2/C3 替换为实际 view。
This commit is contained in:
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