Fix mobile bottom nav sizing and improve ticket view on mobile

Mobile bottom nav:
- Consistent sizing for icons (1.1rem) and text (0.7rem)
- Added .nav-label class for text labels
- Increased height to 64px for better touch targets
- Added active state styling

Ticket view mobile improvements:
- Full width container (removed margins, no side borders)
- Wider tab content areas with proper padding
- Tabs now fill available width
- Active tab has bottom border indicator
- Description textarea full width with proper sizing
- Markdown preview with better font sizing
- Improved comment form styling

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

assets/css/dashboard.css

@@ -5700,7 +5700,7 @@ table td:nth-child(4) {
         bottom: 0;
         left: 0;
         right: 0;
-        height: 60px;
+        height: 64px;
         background: var(--bg-primary);
         border-top: 2px solid var(--terminal-green);
         z-index: var(--z-dropdown);
@@ -5714,18 +5714,27 @@ table td:nth-child(4) {
         flex-direction: column;
         align-items: center;
         justify-content: center;
-        gap: 0.25rem;
+        gap: 0.15rem;
         background: transparent;
         border: none;
         color: var(--terminal-green);
         text-decoration: none;
-        font-size: 0.65rem;
+        font-size: 0.7rem;
         font-family: var(--font-mono);
-        padding: 0.5rem;
+        padding: 0.5rem 0.25rem;
+        min-height: 64px;
     }
 
     .mobile-bottom-nav .nav-icon {
-        font-size: 1.25rem;
+        font-size: 1.1rem;
+        line-height: 1;
+    }
+
+    .mobile-bottom-nav .nav-label {
+        font-size: 0.7rem;
+        line-height: 1;
+        text-transform: uppercase;
+        letter-spacing: 0.5px;
     }
 
     .mobile-bottom-nav a:active,
@@ -5733,6 +5742,12 @@ table td:nth-child(4) {
         background: rgba(0, 255, 65, 0.2);
     }
 
+    .mobile-bottom-nav a.active,
+    .mobile-bottom-nav button.active {
+        color: var(--terminal-amber);
+        text-shadow: var(--glow-amber);
+    }
+
     /* ===== HIDE PREVIEW POPUP ON MOBILE ===== */
     .ticket-preview-popup {
         display: none !important;