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

templates/base.html

@@ -5,6 +5,9 @@
     <meta charset="utf-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0, shrink-to-fit=no">
     <title>{% block title %}Yaris OBD{% endblock %}</title>
+    <link rel="preconnect" href="https://fonts.googleapis.com">
+    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
+    <link href="https://fonts.googleapis.com/css2?family=Racing+Sans+One&display=swap" rel="stylesheet">
     <link rel="stylesheet" href="{{ url_for('static', filename='bootstrap/css/bootstrap.min.css') }}">
     <link rel="stylesheet" href="{{ url_for('static', filename='yaris.css') }}">
     <link rel="stylesheet" href="{{ url_for('static', filename='fonts/fontawesome-all.min.css') }}">
@@ -16,8 +19,7 @@
     {# ── Desktop sidebar ─────────────────────────────────────────────────── #}
     <nav id="app-sidebar" class="app-sidebar d-none d-md-flex flex-column">
         <a class="sidebar-brand" href="{{ url_for('index') }}" aria-label="Home">
-            <i class="fas fa-car sidebar-brand-icon"></i>
-            <span class="sidebar-brand-text">{{ car.model }}</span>
+            <span class="sidebar-brand-logo">YARIS</span>
         </a>
         <hr class="sidebar-divider">
         <ul class="nav flex-column flex-grow-1">
@@ -65,8 +67,7 @@
             <div class="container-fluid px-3 gap-2">
                 {# Mobile: logo on left #}
                 <a class="navbar-brand d-flex d-md-none align-items-center gap-2 text-decoration-none" href="{{ url_for('index') }}">
-                    <i class="fas fa-car text-primary"></i>
-                    <span class="fw-bold text-dark">{{ car.model }}</span>
+                    <span style="font-family:'Racing Sans One','Arial Black',sans-serif;font-size:1.3rem;font-style:italic;color:#1c1c1e;">YARIS</span>
                 </a>
                 <div class="ms-auto d-flex align-items-center gap-2">
                     <div class="dropdown">