fix(settings): surface "installed but not runnable" state in tool cards

After an install/update command succeeds, re-probe the tool version: if it
still can't be detected the tool is installed-but-unrunnable (e.g. Node too
old), so report a warning toast and show "installed · can't run" with the
cause, instead of a misleading "success" plus a stale version number.

Read the backend `installed_but_broken` flag rather than matching error
text; the card's current-version line, action button (no useless "install"
for a broken tool), and a "check environment" hint all key off it. Drop the
now-redundant version-clearing setState (the refresh merge already nulls it),
flatten the action ternary, and use extractErrorMessage in the catch path.

Adds toolNotRunnable / toolActionInstalledNotRunnable / installedNotRunnable
/ toolCheckEnv i18n keys (zh/en/ja).

src/lib/api/settings.ts

@@ -185,6 +185,7 @@ export const settingsApi = {
       version: string | null;
       latest_version: string | null;
       error: string | null;
+      installed_but_broken: boolean;
       env_type: "windows" | "wsl" | "macos" | "linux" | "unknown";
       wsl_distro: string | null;
     }>