style: dark sidebar + Racing Sans One YARIS wordmark logo

- Sidebar bg: navy (#1a1a2e) → dark gray (#1c1c1e)
- Logo: replaced fa-car icon + text with styled YARIS wordmark
  using Racing Sans One (free Google Font, OFL licensed)
- Red accent underline (#e63946) on logo
- Applied to both server (server/templates/base.html) and
  Pi (templates/base.html) + mobile topbar

static/yaris.css

@@ -4,10 +4,11 @@
     --sidebar-width: 14rem;
     --sidebar-collapsed-width: 4rem;
     --topbar-height: 3.5rem;
-    --sidebar-bg: #1a1a2e;
+    --sidebar-bg: #1c1c1e;
     --sidebar-hover: rgba(255,255,255,.08);
     --sidebar-active: rgba(255,255,255,.15);
     --primary: #4e73df;
+    --accent: #e63946;
 }
 
 body {
@@ -38,7 +39,7 @@ body {
 .sidebar-brand {
     display: flex;
     align-items: center;
-    gap: .75rem;
+    gap: 0;
     padding: 1.25rem 1rem;
     color: #fff;
     text-decoration: none;
@@ -48,13 +49,43 @@ body {
 
 .sidebar-brand:hover { color: rgba(255,255,255,.85); }
 
-.sidebar-brand-icon {
-    font-size: 1.25rem;
-    flex-shrink: 0;
-    width: 2rem;
-    text-align: center;
+/* ── YARIS logo wordmark ──────────────────────────────────────────────── */
+
+.sidebar-brand-logo {
+    font-family: 'Racing Sans One', 'Arial Black', sans-serif;
+    font-size: 1.55rem;
+    font-weight: 400;
+    font-style: italic;
+    letter-spacing: .06em;
+    color: #fff;
+    line-height: 1;
+    position: relative;
+    display: inline-block;
 }
 
+.sidebar-brand-logo::after {
+    content: '';
+    position: absolute;
+    bottom: -2px;
+    left: 0;
+    width: 100%;
+    height: 3px;
+    background: var(--accent);
+    border-radius: 2px;
+}
+
+.app-sidebar.collapsed .sidebar-brand-logo {
+    font-size: 1.3rem;
+    letter-spacing: 0;
+    /* Show only first letter when collapsed */
+    visibility: visible;
+}
+
+.app-sidebar.collapsed .sidebar-brand-logo::after {
+    display: none;
+}
+
+/* Old — kept for compatibility, not used by new logo */
 .sidebar-brand-text {
     font-weight: 700;
     font-size: .95rem;