fix(showcase): translate the object-less action, restoring the i18n ratchet

TypeScript Type Check went red on `check:i18n-coverage`, not on types:

  examples/app-showcase/objectstack.config.ts: untranslated declared
  strings grew 456 -> 458

That gate freezes each example's untranslated-string debt and fails the
moment it grows. The new action declares exactly two strings — `label` and
`successMessage` — so the +2 is mine.

Translated rather than ratcheted. Raising the baseline to 458 would have
made the gate green by widening the debt it exists to prevent, and there is
in-file precedent against that: `showcase_action_param_gallery`'s
`p_assignee` was "translated at birth" for this exact reason (#3405).

The keys go under the bundle's top-level `globalActions` slot, which is the
ONLY place the resolver looks for an action declaring no `objectName` —
keys for such an action under `objects.*._actions` are never read. That
slot had zero users anywhere in the repo before this, which follows from
the same gap #3913 left: no object-less action existed to translate. So the
specimen now also covers the object-less translation path.

Verified the key genuinely resolves rather than being silently ignored: with
the name misspelled, `os lint` reports `translation-target-unknown` at
`translations[0].en.globalActions.showcase_portfolio_snapshotX` with a "Did
you mean showcase_portfolio_snapshot?" suggestion; spelled correctly it is
clean.

check-i18n-coverage back to OK (none new, baseline untouched at 456),
`os lint` 0 errors, tsc clean, eslint clean, 60 tests pass, build green.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011AvZj6cLX7APd7roh2eK4F

Author: claude

examples/app-showcase/src/system/translations/index.ts

@@ -138,6 +138,17 @@ export const ShowcaseTranslationBundle = {
         label: 'Field Zoo', pluralLabel: 'Field Zoo',
       },
     },
+    // The OBJECT-LESS action slot (framework#3913). `globalActions` is the only
+    // place the resolver looks for an action that declares no `objectName` —
+    // keys for such an action under `objects.*._actions` are never read. Before
+    // `showcase_portfolio_snapshot` the showcase had no object-less action, so
+    // this slot had no specimen anywhere in the repo.
+    globalActions: {
+      showcase_portfolio_snapshot: {
+        label: 'Portfolio Snapshot',
+        successMessage: 'Portfolio snapshot taken.',
+      },
+    },
   },
   'zh-CN': {
     objects: {
@@ -286,5 +297,16 @@ export const ShowcaseTranslationBundle = {
         },
       },
     },
+    // See the `en` block: object-less actions resolve ONLY through
+    // `globalActions`. Translated at birth for the same reason as
+    // `showcase_action_param_gallery.params.p_assignee` above — this example is
+    // ratcheted at its current untranslated count, so a new declared label that
+    // skips zh-CN widens the debt and fails `check-i18n-coverage`.
+    globalActions: {
+      showcase_portfolio_snapshot: {
+        label: '业务概览',
+        successMessage: '已生成业务概览。',
+      },
+    },
   },
 };