fix(app-iced): M116 r5 —— 圆角状态行独立成「状态」（换色加粗）+ 说明段去掉重复并压短

r5 复审 p2-1（图上）、p2-2（证据文档两处）。

## P2-1：状态行要被当成「状态」看见
- 说明段 `SettingsAppearanceCornerHint` 里那句 α 说明**删掉**，只留平台分工（Win11/Server 2025
  请求系统圆角、Win10 直角、macOS/Linux 看桌面合成器、我们不自绘）——英文从约 470 字符 /
  7 行压到 3 行（1180 宽、100% DPI 实测）。
- `SettingsAppearanceCornerSuspended` 改成**只由状态行说**，且状态行不再是「说明段的续行」：
  紧贴在档位行下面，颜色换成设计令牌 `Role::Tertiary`、字重加粗（`note_line` 保持原形，
  新增 4 行的 `state_line` 助手）。档位本身照常显示用户选的值，不改成「直角」。
- 出图复核（四张，浅/深 × α=100/85）：α=85 两张能看到一条**加粗的第三色**状态行，
  α=100 两张没有；状态行墨色由 `(63,76,87)`（与说明段同色）变为 `(116,108,140)`（Tertiary）。

## P2-2：证据文档两处
- `DevDocs/artifacts/m116/probe-table.md` 的 `readback` 归因：`0x04000000`=`WS_CLIPSIBLINGS`
  是 **`CreateWindowExW` 自己补的**（建完就在），`ShowWindow` **只补** `0x10000000`=`WS_VISIBLE`；
  按 r5 复审的最小实验写清（req `0x00CF0000` → before `0x04CF0000` → after `0x14CF0000`），
  读数一行未动。
- `corner/tests.rs` 里「本 mission 没构建 bin」改成指向 2026-11-04 的两次真跑记录
  （`DevDocs/artifacts/m116/README.md` 的 `[corner] boot …` 两行）。

门禁（`CARGO_TARGET_DIR=C:/Temp/ull-target/wt-116-r2`，`-j 2`，跑完已删）：
fmt --check 0 / `cargo test -p unlucky-app-iced --lib` 0（475 passed）/ `-p unlucky-i18n --lib` 0（24 passed）。

crates/i18n/src/catalog/golden.rs

@@ -60,7 +60,7 @@ pub(super) const GOLDEN: &[(&str, &str, &str)] = &[
     ("SettingsAppearanceCorner", "Window corners", "窗口圆角"),
     ("SettingsAppearanceCornerSystem", "Follow system", "跟随系统"),
     ("SettingsAppearanceCornerSquare", "Square", "直角"),
-    ("SettingsAppearanceCornerHint", "On Windows 11 and Server 2025 we ask the system to round the window; whether it does, and how the edge looks, is up to the compositor. Software rendering does not change that - corners are drawn by the system, not by our renderer. While window transparency is below 100%, Windows does not round the window; the corners come back at 100%. Windows 10 keeps square corners. On macOS and Linux the desktop's own rules apply, and we never draw corners ourselves.", "Windows 11 与 Windows Server 2025 上我们请求系统处理窗口外框圆角：是否圆、边缘什么样由系统合成器决定（软件渲染也一样——圆角由系统画，不由我们的渲染器画）。开启整窗透明度（低于 100%）时，Windows 不会给窗口圆角；透明度回到 100% 圆角自动恢复。Windows 10 保持直角；macOS 与 Linux 交给桌面自己的规则，我们不自己画圆角。"),
+    ("SettingsAppearanceCornerHint", "On Windows 11 and Server 2025 we ask the system for rounded corners; Windows 10 keeps square corners. On macOS and Linux the desktop's own rules apply. We never draw corners ourselves.", "Windows 11 与 Windows Server 2025 上我们请求系统处理外框圆角；Windows 10 保持直角；macOS 与 Linux 交给桌面合成器自己的规则；我们不自己画圆角。"),
     ("SettingsAppearanceCornerSuspended", "Not in effect right now: window transparency is below 100%. Setting it back to 100% restores the rounded corners.", "当前因整窗透明度不生效：把整窗透明度调回 100% 圆角即恢复。"),
     ("CoreTextUntranslated", "[system text not translated]", "［未翻译的系统文案］"),
     ("DownloadTitle", "Version management", "版本管理"),

crates/i18n/src/catalog/settings/appearance.rs

@@ -21,8 +21,8 @@ macro_rules! settings_appearance_entries {
             SettingsAppearanceCornerSystem => ("Follow system", "跟随系统"),
             SettingsAppearanceCornerSquare => ("Square", "直角"),
             SettingsAppearanceCornerHint => (
-                "On Windows 11 and Server 2025 we ask the system to round the window; whether it does, and how the edge looks, is up to the compositor. Software rendering does not change that - corners are drawn by the system, not by our renderer. While window transparency is below 100%, Windows does not round the window; the corners come back at 100%. Windows 10 keeps square corners. On macOS and Linux the desktop's own rules apply, and we never draw corners ourselves.",
-                "Windows 11 与 Windows Server 2025 上我们请求系统处理窗口外框圆角：是否圆、边缘什么样由系统合成器决定（软件渲染也一样——圆角由系统画，不由我们的渲染器画）。开启整窗透明度（低于 100%）时，Windows 不会给窗口圆角；透明度回到 100% 圆角自动恢复。Windows 10 保持直角；macOS 与 Linux 交给桌面自己的规则，我们不自己画圆角。"
+                "On Windows 11 and Server 2025 we ask the system for rounded corners; Windows 10 keeps square corners. On macOS and Linux the desktop's own rules apply. We never draw corners ourselves.",
+                "Windows 11 与 Windows Server 2025 上我们请求系统处理外框圆角；Windows 10 保持直角；macOS 与 Linux 交给桌面合成器自己的规则；我们不自己画圆角。"
             ),
             SettingsAppearanceCornerSuspended => (
                 "Not in effect right now: window transparency is below 100%. Setting it back to 100% restores the rounded corners.",