test(app-shell): make field-rule 'non-CEL dialect' fixture forward-compatible (#2696)

The 'skips non-CEL dialect envelopes' test used `{ dialect: 'js', source: '!!!' }`.
framework#3278 (spec PR #3291) retires the `js` expression dialect from
`ExpressionDialect` (now `cel|cron|template`), which will make that envelope
shape-invalid once objectui bumps to the narrowed spec, breaking the
`.toEqual([])` assertion via a spec-Zod issue at `fields.status.visibleWhen`.

Swap to `{ dialect: 'template', source: '!!!' }` — a well-typed NON-CEL dialect
that survives the narrowing. It must stay non-CEL: `predicateSource` only lints
`dialect: undefined | 'cel'`, so `dialect: 'cel'` would make the lint OWN the
garbage source and flag it, flipping the assertion. Behavior-neutral against the
current spec (15.1.1, `js` still present) and the future narrowed spec alike.

Co-authored-by: Jack Zhuang <277994282+os-zhuang@users.noreply.github.com>
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

Author: os-zhuang

packages/app-shell/src/views/metadata-admin/clientValidation.fieldRules.test.ts

@@ -76,9 +76,14 @@ describe('validateMetadataDraft — object field conditional rules (real engine)
   });
 
   it('skips non-CEL dialect envelopes (the engine owns that error, not the CEL lint)', async () => {
+    // A well-typed NON-CEL dialect whose garbage `source` the CEL lint must
+    // leave alone (`predicateSource` only extracts `dialect: undefined | 'cel'`).
+    // Must stay a non-CEL dialect: `dialect: 'cel'` would make the lint OWN
+    // `'!!!'` and flag it, flipping this assertion. `template` survives the
+    // spec's `ExpressionDialect` narrowing (framework#3278 retired `js`).
     const res = await validateMetadataDraft(
       'object',
-      draftWith({ status: { type: 'text', visibleWhen: { dialect: 'js', source: '!!!' } } }),
+      draftWith({ status: { type: 'text', visibleWhen: { dialect: 'template', source: '!!!' } } }),
     );
     expect(res.issues.filter((i) => RULE_PATH.test(i.path))).toEqual([]);
   });