remove(design): drop 'a frame, gifted · v 0.4' tagline from side rail

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

frontend/src/components/TopNav.vue

@@ -23,7 +23,6 @@
         >{{ imagesStore.pendingCount > 9 ? '9+' : imagesStore.pendingCount }}</span>
       </RouterLink>
     </nav>
-    <div class="top-nav__foot">a frame, gifted <span class="top-nav__foot-sep">·</span> v 0.4</div>
   </header>
 </template>
 
@@ -135,19 +134,6 @@ const tabs: Tab[] = [
     font-style: italic;
   }
 
-  // Bottom-of-rail signature — only renders inside the side-rail layout
-  // (positioned absolutely there). Hidden in the horizontal default state.
-  &__foot {
-    display: none;
-    font-size: 12px;
-    font-style: italic;
-    color: var(--color-text-muted);
-    text-align: center;
-    padding: 16px 0 4px;
-    border-top: 1px solid var(--color-border);
-  }
-  &__foot-sep { color: var(--brand-yellow, var(--color-primary)); }
-
   &__tabs {
     display: flex;
     gap: var(--space-1);

frontend/src/styles/design-v2.scss

@@ -55,13 +55,6 @@
         font-family: var(--font-accent-v2);
       }
 
-      &__foot {
-        display: block !important;
-        margin-top: auto;
-        font-family: var(--font-accent-v2);
-        border-top-color: var(--color-border);
-      }
-
       &__tabs {
         flex: 0 0 auto !important;  // override v1's flex:1 so __foot can push to bottom
         flex-direction: column;