fix(i18n): Translate missing Chinese UI text and guard the text catalog (#93)

The source-text catalog (locales/text/zh.json) is keyed by the English text, so reworded or new UI strings silently fell back to English (e.g. the language server JDK hint on the Java settings page). Adds the 321 missing Chinese translations, updates the 3 reworded keys, removes 45 stale keys, and makes the file-refactoring failure titles translatable.

New guard test (src/platform/locales/textCatalog.test.ts) parses src/ for literals that reach the translation layer and fails on missing or stale catalog entries, with an explicit allowlist for untranslated text.

Claude-Session: https://claude.ai/code/session_01VUYsdXA2nkF5v6zsC93dpn

src/features/project-tree/fileRefactor.ts

@@ -245,7 +245,7 @@ export async function runFileRefactoring(
   } catch (e) {
     notifications().notify({
       level: "error",
-      title: `Cannot ${label.toLowerCase()} ${moves.length === 1 ? nameOf(moves[0]!.from) : `${moves.length} items`}`,
+      title: `${label === "Move" ? "Cannot move" : "Cannot rename"} ${moves.length === 1 ? nameOf(moves[0]!.from) : `${moves.length} items`}`,
       body: e instanceof Error ? e.message : String(e),
     });
     return "failed";