fix(design-v2): !important on side rail subtitle + footer display

Vue scoped CSS hides the subtitle and footer by default; my design-v2
override of display:block tied on specificity and lost to source order.
!important on the v2-only display rules forces the show.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend/src/styles/design-v2.scss

@@ -48,13 +48,15 @@
       }
       &__wordmark { font-size: var(--text-xl); font-family: var(--font-display-v2); font-weight: 400; }
 
+      // !important needed because TopNav's scoped style hides these by default
+      // at the same specificity and cascades after the main bundle.
       &__sub {
-        display: block;
+        display: block !important;
         font-family: var(--font-accent-v2);
       }
 
       &__foot {
-        display: block;
+        display: block !important;
         margin-top: auto;
         font-family: var(--font-accent-v2);
         border-top-color: var(--color-border);