feat: more granular local environment checks (#870)

* feat: more granular local environment checks

* refactor: improve PR #870 with i18n, shadcn Select, and testable helpers

- Extract is_valid_shell, is_valid_shell_flag, default_flag_for_shell
  to module-level #[cfg(windows)] functions for testability
- Add unit tests for extracted helper functions
- Replace native <select> with shadcn/ui Select components
- Extract env badge ternary to ENV_BADGE_CONFIG Record lookup
- Add i18n keys for env badges and WSL selectors (zh/en/ja)
- Unify initial useEffect load path with loadAllToolVersions()

* fix: prevent useEffect re-firing on wslShellByTool changes

The useEffect that loads initial tool versions depended on
loadAllToolVersions, which in turn depended on wslShellByTool.
This caused a full re-fetch of all 4 tools every time the user
changed a WSL shell or flag, racing with the single-tool refresh.

Fix: use empty deps [] since this is a mount-only effect. The
refresh button and shell/flag handlers cover subsequent updates.

---------

Co-authored-by: Jason <farion1231@gmail.com>

src/i18n/locales/en.json

@@ -37,7 +37,8 @@
     "search": "Search",
     "reset": "Reset",
     "actions": "Actions",
-    "deleting": "Deleting..."
+    "deleting": "Deleting...",
+    "auto": "Auto"
   },
   "apiKeyInput": {
     "placeholder": "Enter API Key",
@@ -452,6 +453,14 @@
     "oneClickInstall": "One-click Install",
     "oneClickInstallHint": "Install Claude Code / Codex / Gemini CLI / OpenCode",
     "localEnvCheck": "Local environment check",
+    "envBadge": {
+      "wsl": "WSL",
+      "windows": "Win",
+      "macos": "macOS",
+      "linux": "Linux"
+    },
+    "wslShell": "Shell",
+    "wslShellFlag": "Flag",
     "installCommandsCopied": "Install commands copied",
     "installCommandsCopyFailed": "Copy failed, please copy manually.",
     "importFailedError": "Import config failed: {{message}}",

src/i18n/locales/ja.json

@@ -37,7 +37,8 @@
     "search": "検索",
     "reset": "リセット",
     "actions": "操作",
-    "deleting": "削除中..."
+    "deleting": "削除中...",
+    "auto": "自動"
   },
   "apiKeyInput": {
     "placeholder": "API Key を入力",
@@ -452,6 +453,14 @@
     "oneClickInstall": "ワンクリックインストール",
     "oneClickInstallHint": "Claude Code / Codex / Gemini CLI / OpenCode をインストール",
     "localEnvCheck": "ローカル環境チェック",
+    "envBadge": {
+      "wsl": "WSL",
+      "windows": "Win",
+      "macos": "macOS",
+      "linux": "Linux"
+    },
+    "wslShell": "Shell",
+    "wslShellFlag": "フラグ",
     "installCommandsCopied": "インストールコマンドをコピーしました",
     "installCommandsCopyFailed": "コピーに失敗しました。手動でコピーしてください。",
     "importFailedError": "設定のインポートに失敗しました: {{message}}",

src/i18n/locales/zh.json

@@ -37,7 +37,8 @@
     "search": "查询",
     "reset": "重置",
     "actions": "操作",
-    "deleting": "删除中..."
+    "deleting": "删除中...",
+    "auto": "自动"
   },
   "apiKeyInput": {
     "placeholder": "请输入API Key",
@@ -452,6 +453,14 @@
     "oneClickInstall": "一键安装",
     "oneClickInstallHint": "安装 Claude Code / Codex / Gemini CLI / OpenCode",
     "localEnvCheck": "本地环境检查",
+    "envBadge": {
+      "wsl": "WSL",
+      "windows": "Win",
+      "macos": "macOS",
+      "linux": "Linux"
+    },
+    "wslShell": "Shell",
+    "wslShellFlag": "标志",
     "installCommandsCopied": "安装命令已复制",
     "installCommandsCopyFailed": "复制失败，请手动复制。",
     "importFailedError": "导入配置失败：{{message}}",