fix: enlarge brand/logo section in sidebar

- Increase min-height from 56px to 68px
- Logo maxHeight 32px → 44px, maxWidth 140px → 160px
- Brand title font-size 1.25rem → 1.5rem
- More padding in brand area

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/frontend/src/shell/AppLayout.module.css

@@ -24,22 +24,23 @@
 
 /* ===== Brand / Logo ===== */
 .brand {
-  padding: 1.25rem 1.5rem;
+  padding: 1.5rem;
   border-bottom: 1px solid rgba(255, 255, 255, 0.1);
   display: flex;
   align-items: center;
   justify-content: space-between;
   gap: 0.5rem;
-  min-height: 56px;
+  min-height: 68px;
 }
 
 .sidebarCollapsed .brand {
   padding: 1.25rem 0;
   justify-content: center;
+  min-height: 56px;
 }
 
 .brand h2 {
-  font-size: 1.25rem;
+  font-size: 1.5rem;
   font-weight: 700;
   letter-spacing: 2px;
   color: #60a5fa;

packages/frontend/src/shell/AppLayout.tsx

@@ -172,8 +172,8 @@ export function AppLayout() {
                 src={branding.logo}
                 alt="Logo"
                 style={{
-                  maxHeight: 32,
+                  maxHeight: 44,
-                  maxWidth: 140,
+                  maxWidth: 160,
                   objectFit: 'contain',
                 }}
               />