fix(store,audit,workspace): usertest low-findings tail (0.72.1)

- Store hero: 'TODAY' badge only for an operator-accepted story; the
  rotating compiled-in fallback deck now says 'FEATURED' (no false
  freshness claim). Policy as a top-level function with unit tests.
- Audit filter chips: standard label typography instead of mono —
  mono stays reserved for paths and identifiers.
- DE chain wording: 'Hash-Kette geprüft' as the one confirmation term
  (audit header now matches the doctor pill); 'intakt' stays the
  state headline. EN was already consistent.
- Workspace switcher: contrast bump for the sealed-area 'stopped'
  label.

Signed-off-by: flemming-it <stefan.a.flemming@googlemail.com>

test/store_today_badge_test.dart

@@ -0,0 +1,15 @@
+import 'package:chain_studio/pages/store.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  group('store hero badge policy', () {
+    test('a single operator-accepted story may claim TODAY', () {
+      expect(storeDeckIsAcceptedToday(1), isTrue);
+    });
+
+    test('the rotating fallback deck must not claim TODAY', () {
+      expect(storeDeckIsAcceptedToday(2), isFalse);
+      expect(storeDeckIsAcceptedToday(8), isFalse);
+    });
+  });
+}