fix(i18n): prevent zh-TW tool management fallbacks (#5943)

Complete the Traditional Chinese strings for the About-page tool manager and align the install/update hint with the current supported tools. Add locale coverage that requires every tool-management label and preserves interpolation variables across all four translations.

Constraint: The About tool manager was extended across three commits without matching zh-TW entries.
Rejected: Rely on i18next fallback text | leaves the Traditional Chinese UI partially English and hides future locale drift.
Confidence: high
Scope-risk: narrow
Directive: Update toolManagementLocales.test.ts whenever the About tool manager adds a translatable label.
Tested: pnpm typecheck; pnpm format:check; 7 locale tests; 575 Vitest tests; zero missing zh-TW settings keys
Not-tested: Manual visual inspection of the About page
Related: e3df86587, ea604a182, 014c82d28

src/i18n/locales/zh-TW.json

@@ -793,9 +793,39 @@
     "viewCurrentReleaseNotes": "檢視目前版本更新日誌",
     "officialWebsite": "官方網站",
     "github": "GitHub",
+    "manualInstallCommands": "手動安裝指令",
     "oneClickInstall": "一鍵安裝",
-    "oneClickInstallHint": "安裝 Claude Code / Codex / Gemini CLI / OpenCode",
+    "oneClickInstallHint": "安裝或更新 Claude Code / Codex / Gemini CLI / OpenCode / OpenClaw / Hermes",
     "localEnvCheck": "本地環境檢查",
+    "updateAllTools": "全部更新（{{count}}）",
+    "currentVersion": "目前版本",
+    "latestVersion": "最新版本",
+    "updateAvailableShort": "可更新",
+    "toolInstall": "安裝",
+    "toolUpdate": "更新",
+    "toolReady": "已就緒",
+    "toolActionDone": "{{count}} 個工具{{action}}完成",
+    "toolActionPartial": "{{succeeded}} 個{{action}}成功，{{failed}} 個失敗",
+    "toolActionFailed": "安裝/更新指令執行失敗",
+    "toolNotRunnable": "已安裝但無法執行（未偵測到版本）",
+    "toolActionVersionUnchangedTitle": "版本未變更",
+    "toolActionVersionUnchanged": "仍為 {{version}}（最新版本：{{latest}}）。上游更新程式可能回報成功，但實際上並未套用更新。",
+    "toolActionInstalledNotRunnable": "已安裝，但目前環境無法執行，請檢查",
+    "installedNotRunnable": "已安裝 · 無法執行",
+    "toolCheckEnv": "請檢查執行環境",
+    "toolDiagnose": "診斷安裝衝突",
+    "toolDiagnosing": "診斷中…",
+    "toolConflictTitle": "偵測到多處安裝",
+    "toolConflictHint": "命令列實際使用標示為「預設」的項目；更新可能已寫入其他位置。",
+    "toolConflictDefault": "預設",
+    "toolConflictNotRunnable": "無法執行",
+    "toolDiagnoseNoConflict": "未發現安裝衝突",
+    "toolDiagnoseFailed": "診斷失敗",
+    "toolUpgradeConfirmTitle": "確認更新位置",
+    "toolUpgradeConfirmHint": "偵測到多處安裝。本次更新不會更新所有安裝；請以下方各工具顯示的實際更新位置為準。",
+    "toolUpgradeWillRun": "將執行：",
+    "toolUpgradeConfirmBtn": "確認更新",
+    "toolUpgradeUnanchoredHint": "無法判定命令列實際使用的安裝位置；將執行預設更新指令（可能安裝至 PATH 中第一個 npm）。",
     "envBadge": {
       "wsl": "WSL",
       "windows": "Win",

tests/config/toolManagementLocales.test.ts

@@ -0,0 +1,83 @@
+import { describe, expect, it } from "vitest";
+import en from "@/i18n/locales/en.json";
+import ja from "@/i18n/locales/ja.json";
+import zhTW from "@/i18n/locales/zh-TW.json";
+import zh from "@/i18n/locales/zh.json";
+
+const requiredKeys = [
+  "manualInstallCommands",
+  "updateAllTools",
+  "currentVersion",
+  "latestVersion",
+  "updateAvailableShort",
+  "toolInstall",
+  "toolUpdate",
+  "toolReady",
+  "toolActionDone",
+  "toolActionPartial",
+  "toolActionFailed",
+  "toolNotRunnable",
+  "toolActionVersionUnchangedTitle",
+  "toolActionVersionUnchanged",
+  "toolActionInstalledNotRunnable",
+  "installedNotRunnable",
+  "toolCheckEnv",
+  "toolDiagnose",
+  "toolDiagnosing",
+  "toolConflictTitle",
+  "toolConflictHint",
+  "toolConflictDefault",
+  "toolConflictNotRunnable",
+  "toolDiagnoseNoConflict",
+  "toolDiagnoseFailed",
+  "toolUpgradeConfirmTitle",
+  "toolUpgradeConfirmHint",
+  "toolUpgradeWillRun",
+  "toolUpgradeConfirmBtn",
+  "toolUpgradeUnanchoredHint",
+] as const;
+
+type SettingsTranslations = Record<string, unknown>;
+
+const locales = [
+  ["en", en.settings],
+  ["ja", ja.settings],
+  ["zh", zh.settings],
+  ["zh-TW", zhTW.settings],
+] as const;
+
+function interpolationVariables(value: string): string[] {
+  return Array.from(
+    value.matchAll(/\{\{([^}]+)\}\}/g),
+    ([, name]) => name,
+  ).sort();
+}
+
+describe("About tool management locale coverage", () => {
+  it.each(locales)(
+    "defines every tool management key in %s",
+    (_locale, settings) => {
+      const missing = requiredKeys.filter((key) => {
+        const value = (settings as SettingsTranslations)[key];
+        return typeof value !== "string" || value.trim().length === 0;
+      });
+
+      expect(missing).toEqual([]);
+    },
+  );
+
+  it.each(locales.slice(1))(
+    "preserves interpolation variables in %s",
+    (_locale, settings) => {
+      for (const key of requiredKeys) {
+        const expected = en.settings[key];
+        const actual = (settings as SettingsTranslations)[key];
+
+        expect(typeof actual).toBe("string");
+        expect(interpolationVariables(actual as string)).toEqual(
+          interpolationVariables(expected),
+        );
+      }
+    },
+  );
+});