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>

lib/pages/audit.dart

@@ -620,9 +620,11 @@ class _ChipButtonState extends State<_ChipButton> {
           ),
           child: Text(
             widget.label,
-            style: ChainTheme.mono(
-              size: 11,
-              weight: widget.selected ? FontWeight.w500 : FontWeight.w400,
+            // UI label, not a value — mono is reserved for
+            // paths/identifiers (usertest finding: the chips
+            // read as foreign bodies in the header).
+            style: theme.textTheme.labelMedium?.copyWith(
+              fontWeight: widget.selected ? FontWeight.w600 : FontWeight.w400,
               color: fg,
             ),
           ),