fix(app-shell): move the #4575 German percent sample pin onto the locale convention (#4576)

`DatasetDefaultInspector`'s format-sample pin asserted the literal-suffix
German form `12,3%`. The measure formatter now renders the locale's own
percent convention, so the sample gained the no-break space before the
sign, exactly as the two `dataset-format.locale.test.ts` pins did.

Third and last authorized pin move for this card. The en sample in the
case below it is unmoved, which is what says this is a convention change
and not a numeral one. Caught by CI shard 3/4: my local sweep covered
core / i18n / fields / plugin-dashboard / plugin-report but not
app-shell, which is also a `formatMeasure` consumer. Re-swept the full
consumption radius since: app-shell 394 files / 3,725 tests green, and
plugin-gantt + plugin-grid + components 231 files / 2,064 tests green.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017Qqyix2QcnpUC9XeYVDzx3

Author: claude

packages/app-shell/src/views/metadata-admin/inspectors/DatasetDefaultInspector.measureLocale.test.tsx

@@ -127,7 +127,15 @@ describe('dataset inspector format sample follows the display locale (objectui#4
     );
     // The decimal COMMA is the point: `12.3%` and `12,3%` read as different
     // numbers to the two audiences, not as the same one restyled.
-    expect(sampleText()).toBe('12,3%');
+    //
+    // PIN MOVED (objectui#4576). The German expectation gained the no-break
+    // space before the sign. `formatMeasure` appended a literal '%' in every
+    // locale; it now renders the locale's own percent convention, the one a
+    // list cell has used since #4553. The en sample in the case below is
+    // UNMOVED, which is what says this was a convention change and not a
+    // numeral one. Same class as the two moves in
+    // `packages/core/src/utils/__tests__/dataset-format.locale.test.ts`.
+    expect(sampleText()).toBe('12,3\u00a0%');
   });
 
   it('keeps the en percent sample byte-identical (must-not-change)', () => {