merge: origin/dev（1623f68）合入 M197 分支——解 golden/tail.rs 冲突

基线：合的是 **origin/dev**（`1623f68`）。`origin/main` 是 D41 的孤儿发布快照
（`d616d65` parents 为空），不参与合并。用 merge 而不是 rebase，保住三轮复审 clean 的 tip。

冲突只有一个：`crates/i18n/src/catalog/golden/tail.rs`（热点文件，多条 mission 都往这里加 key）。

解法（不重排别人的行、不改别人的译文）：
1. 以 **dev 侧 398 行**为底稿（含其它 mission 后加的 key）；
2. 把 M197 的 68 行（`SettingsJavaTooNew` … `SettingsJavaReasonInstallRootTooLong`）
   整块插在 `SettingsJavaReasonWriteFailed` 之后、M174 助手域（`SettingsGroupAssistant`）之前
   —— 即 `settings_java_entries` 那段之后，装配链的正确位置；
3. 两侧合起来 463 行会越过 400 行硬线，于是按既有先例把**M174 助手域起的那半截**
   （dev 的 260 行）整段纯搬移到 `golden/tail_ai.rs`：`tail.rs` 211 行 / `tail_ai.rs` 274 行，
   链序 `golden → tail → tail_ai → tail2` 不变，逐字节不删不改；
4. 解冲突时发现 dev 的 golden 行还是 M197 之前的旧文案（`SettingsJavaEmptyBody` /
   `SettingsJavaAddHint` 的反引号、`SettingsJavaNeverScannedBody` 的旧说法），已把这三条的
   金表行同步回域文件里的现行文案（`split_keeps_every_translation` 逐位置比对当场抓出来的）。

顺带（合并导致的越线）：`crates/core/src/download/engine.rs` 两侧各 400 行、合并后 401
（我 +1 行 `kind: err.kind`，dev +1 行），把模块文档里那三行散文重排成两行（一字未删）→ 400 行。
同一次还把这文件里对 `MirrorTable::set_gh_proxy` 的旧描述改成 M193 的现实（那两个函数已被删）。

验证：fmt 0 · check（app-iced+core+i18n all-targets）0 · i18n 36 · engine_mock 8 · app-iced java 45 ·
core lib java 71 · setting 116 · app-iced lib 全量 832；全仓 file-size 守门脚本复制执行 → 超限 0。

crates/i18n/src/catalog/golden/tail.rs

@@ -1,12 +1,13 @@
-//! 金表的**第二段**（`InstancesLaunchReset` 之后到 M175 的 Java 域结束）。
+//! 金表的**后半段的前半截**（`InstancesLaunchReset` 之后、到 M197 的 Java 域结束）。
 //!
 //! 为什么拆：`golden.rs` 在 M157 加了 19 行启动参数文案后到 416 行，越过 400 行硬线；
 //! 拆分口径与仓库其它 `-p1/-p2` 一致——**纯搬移、一行不改**，顺序即 `Key::ALL` 的后半段。
 //! 拼装与断言在 `golden.rs` 的 [`rows`] 与 `catalog/tests.rs`。
 //!
-//! M197 又拆了一次：本段原本一路写到旧 `tail.rs` 末尾（329 行），加了「下载一个 JDK / 三个设置键」
-//! 那 65 条文案后会越过 400 行硬线，于是把 **M174 助手域起的后半截** 搬进 [`super::tail_ai`]
-//! （同样纯搬移、一行不改）。现在的链序是 `golden` → 本段 → `tail_ai` → `tail2`。
+//! **M197 起本段只到 Java 域结束**：M197 往 `settings_java_entries` 追加了 68 行，加上 dev 侧
+//! 其它 mission 后加的行会涨到 470+（越过 400 行硬线），于是把 **M174 助手域起的那半截**
+//! 纯搬移到 [`super::tail_ai`]（链序：`golden` → `tail` → `tail_ai` → `tail2`）。
+//! 搬移只改位置：其余每一行逐字节原样（含其它 mission 后加的行）。
 pub(super) const ROWS: &[(&str, &str, &str)] = &[
     ("LoaderVanilla", "Vanilla", "原版"),
     ("LaunchOutcomeNormal", "Finished normally", "正常结束"),
@@ -28,11 +29,58 @@ pub(super) const ROWS: &[(&str, &str, &str)] = &[
     ("FontCjkReady", "Chinese font ready: {family}", "中文字体已就绪：{family}"),
     ("SettingsLanguage", "Language", "界面语言"),
     ("SettingsLanguageHint", "Switches the interface language. Chinese text needs a Chinese font.", "切换界面语言。显示中文需要中文字体。"),
+    ("SettingsLogsFolder", "Log folder", "日志文件夹"),
+    ("SettingsLogsFolderHint", "What explains a crash lives here: the launcher's own runtime log (launcher.log, rolled over at 1 MiB with one old copy kept) and one jsonl per game session under logs/game/. Sessions from older versions (data/agent/sessions) are still read, not moved.", "解释一次崩溃要看的东西都在这：启动器自己的运行日志（launcher.log，满 1 MiB 滚动一次、只留一份旧档）与每次游戏会话的 jsonl（logs/game/）。旧版本留下的会话（data/agent/sessions）仍然读得出来，不会被搬动。"),
+    ("SettingsLogsCopy", "Copy path", "复制路径"),
+    ("SettingsLogsUnknown", "Data directory not resolved — restart the launcher from its own folder", "数据根没解析出来——从启动器所在目录重新启动试试"),
     ("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 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。"),
+    // M180：外观分组补齐（`catalog/settings/appearance.rs` 的第二批，M116 圆角那 5 条之后）。
+    // 位置就是装配链里那个域的位置——`settings_appearance_entries` 在 `settings_java_entries` 之前，
+    // 所以这 40 行必须落在 `SettingsAppearanceCornerSuspended` 与 `SettingsJavaScan` 之间
+    // （顺序 = `Key::ALL`；为排到文件尾而重排别人的族会让 `split_keeps_every_translation` 整片红）。
+    ("SettingsAppearanceWindowOpacity", "Window transparency", "整窗透明度"),
+    ("SettingsAppearanceWindowOpacityHint", "Applies to the whole window. Floor {floor}; 1.00 = fully opaque.", "作用于整个窗口。下限 {floor}；1.00 = 完全不透明。"),
+    ("SettingsAppearancePanelOpacity", "Panel transparency", "面板透明度"),
+    ("SettingsAppearancePanelOpacityHint", "Only the panel/card layer. Floor {floor}; independent of window transparency.", "只作用于面板 / 卡片这一层。下限 {floor}；与整窗透明度互不影响。"),
+    ("SettingsAppearancePanelOpacityForcedValue", "100% (forced from {requested})", "100%（强制，原请求值 {requested}）"),
+    ("SettingsAppearancePanelOpacityForcedHint", "Software renderer: panels and glass stay fully opaque (window transparency still works).", "软件渲染：面板与玻璃效果恒为不透明（整窗透明度仍然有效）。"),
+    ("SettingsAppearanceBackgroundImage", "Background image", "背景图"),
+    ("SettingsAppearanceOff", "Off", "关"),
+    ("SettingsAppearanceOn", "On", "开"),
+    ("SettingsAppearanceImagePath", "Image path", "图片路径"),
+    ("SettingsAppearancePaletteLevel", "Colours: {level}", "配色：{level}"),
+    ("SettingsAppearanceBgFill", "Fill", "填充方式"),
+    ("SettingsAppearanceBgFillCover", "Cover", "铺满"),
+    ("SettingsAppearanceBgFillContain", "Contain", "完整显示"),
+    ("SettingsAppearanceBgFillTile", "Tile", "平铺"),
+    ("SettingsAppearanceBgDim", "Dim", "暗化"),
+    ("SettingsAppearanceBgDimHint", "Blends the image toward the panel colour so text stays readable. Max {max}.", "把背景图往面板底色上退，让文字读得清。上限 {max}。"),
+    ("SettingsAppearancePaletteSource", "Colour source", "配色来源"),
+    ("SettingsAppearancePaletteBackground", "Background", "取自背景图"),
+    ("SettingsAppearancePaletteWallpaper", "Wallpaper", "取自壁纸"),
+    ("SettingsAppearancePalettePreset", "Preset", "内置色卡"),
+    ("SettingsAppearanceBgReadFailed", "Background image could not be read: {reason}", "背景图读不出来：{reason}"),
+    ("SettingsAppearanceBgDecodeFailed", "Background image could not be decoded ({reason}; this build decodes PNG, JPEG and BMP)", "背景图解不开（{reason}；这个构建只支持 PNG、JPEG 与 BMP）"),
+    ("SettingsAppearanceBgTooLarge", "Background image is too large to decode: {width}×{height} (limit {limit} px per edge)", "背景图太大，解不开：{width}×{height}（每边上限 {limit} 像素）"),
+    ("SettingsAppearanceBgSmallTile", "Small image ({width}×{height}): tiles are scaled up so the window stays covered (max {max} tiles, no gaps).", "图片很小（{width}×{height}）：图块会被放大，保证窗口铺满（最多 {max} 块，不留缝）。"),
+    ("SettingsAppearancePaletteBgUndecodable", "Background image could not be read; colours fall back.", "背景图读不出来，配色回落到下一级。"),
+    ("SettingsAppearancePaletteBgTooSmall", "Background image is too small to sample; colours fall back.", "背景图太小，取不了色，配色回落到下一级。"),
+    ("SettingsAppearancePaletteBgBadDimensions", "Background image data looks inconsistent; colours fall back.", "背景图数据前后不一致，配色回落到下一级。"),
+    ("SettingsAppearancePaletteBgNoOpaquePixels", "Background image is almost fully transparent; colours fall back.", "背景图几乎全透明，配色回落到下一级。"),
+    ("SettingsAppearancePaletteBgLowChroma", "Background image is too monochrome to tint from; colours fall back.", "背景图太单调（彩度不足），取不出配色，回落到下一级。"),
+    ("SettingsAppearancePaletteBgContrast", "Background image colours would be unreadable; colours fall back.", "按背景图取的颜色读不清，配色回落到下一级。"),
+    ("SettingsAppearancePaletteWallpaperUndecodable", "Desktop wallpaper could not be read.", "桌面壁纸读不出来。"),
+    ("SettingsAppearancePaletteWallpaperTooSmall", "Desktop wallpaper is too small to sample.", "桌面壁纸太小，取不了色。"),
+    ("SettingsAppearancePaletteWallpaperBadDimensions", "Desktop wallpaper data looks inconsistent.", "桌面壁纸数据前后不一致。"),
+    ("SettingsAppearancePaletteWallpaperNoOpaquePixels", "Desktop wallpaper is almost fully transparent.", "桌面壁纸几乎全透明。"),
+    ("SettingsAppearancePaletteWallpaperLowChroma", "Desktop wallpaper is too monochrome to tint from.", "桌面壁纸太单调（彩度不足），取不出配色。"),
+    ("SettingsAppearancePaletteWallpaperContrast", "Desktop wallpaper colours would be unreadable; colours fall back.", "按桌面壁纸取的颜色读不清，配色回落到下一级。"),
+    ("SettingsAppearancePalettePresetContrast", "The built-in card needed a small contrast correction.", "内置色卡做了一点对比度修正。"),
+    ("SettingsAppearancePaletteAdjusted", "A few colours were nudged for readability.", "有几个颜色为了可读性做了微调。"),
     // M175：设置页「Java」分组（`catalog/settings/java.rs` 的 `settings_java_entries`）。
     // 位置就是装配链里那个域的位置：`settings_java_entries` 在 `settings_appearance_entries` 之后、
     // `settings_download_entries`（空）与 `settings_ai_entries`（M174）之前，所以这几行必须落在
@@ -45,11 +93,8 @@ pub(super) const ROWS: &[(&str, &str, &str)] = &[
     ("SettingsJavaCancelled", "The scan was cancelled; the list below is from the previous run.", "扫描已取消；下面的列表还是上一次的结果。"),
     ("SettingsJavaScanDone", "{count} JDK found", "找到 {count} 个 JDK"),
     ("SettingsJavaNeverScanned", "Not scanned yet", "还没扫描过"),
-    // M197：这句以前写「在那之前启动器不会自己去扫」，与首屏自动扫（`app/state/construct.rs`
-    // 的 `hydrate_java_settings`）互相打脸；现在说的是同一件事。
     ("SettingsJavaNeverScannedBody", "The list is still empty. The launcher scans once by itself when the settings page opens; press Scan now to look again right away.", "列表还是空的。打开设置页时启动器会自己扫一次；也可以点「立即扫描」立刻再扫一遍。"),
     ("SettingsJavaEmptyTitle", "No Java runtime found", "未检测到 Java 运行时"),
-    // M197：删掉 markdown 反引号（渲染层没有内联代码通道，反引号会原样上屏）。
     ("SettingsJavaEmptyBody", "Nothing matched. Add the path of a JDK you already unpacked below, or install one with ull java install 21 on the command line.", "没找到任何 JDK。可以在下面手动加上你自己解压的那份，或者用命令行 ull java install 21 装一个。"),
     ("SettingsJavaDefault", "Default", "默认"),
     ("SettingsJavaSetDefault", "Use as default", "设为默认"),