Add MOT/insurance renewal hints, table service card, and favicon

- Renewal tracking: compute due/overdue status from the most recent
  mot/insurance event (renewal_months, renewal_due_soon_days settings),
  surfaced on the service card and dashboard.
- Service-status card metrics now render as a two-column label/value
  table with row separators instead of wrapping auto-fill grid cells.
- Add a bicycle favicon (favicon.svg) to base + login templates.

Co-Authored-By: opencode <opencode@users.noreply.github.com>

app/templates/base.html

@@ -4,6 +4,7 @@
 <meta charset="utf-8">
 <meta name="viewport" content="width=device-width, initial-scale=1">
 <title>{% block title %}bike-admin{% endblock %}</title>
+<link rel="icon" href="/static/favicon.svg" type="image/svg+xml">
 <link rel="stylesheet" href="/static/main.css">
 <script src="/static/htmx.min.js" defer></script>
 </head>

app/templates/components/service_card.html

@@ -20,4 +20,16 @@
     <dt>Records</dt><dd>{{ summary.event_count }}</dd>
     <dt>Cost to date</dt><dd>{{ summary.total_cost | money }}</dd>
   </dl>
+  <div class="renewals">
+    <div class="renewal">
+      <span class="renewal-label">MOT</span>
+      <span class="badge {{ renewal_class(summary.mot) }} {{ summary.mot.status }}">{{ renewal_text(summary.mot) }}</span>
+      <span class="muted">due {{ summary.mot.due_date if summary.mot.due_date else 'n/a' }}</span>
+    </div>
+    <div class="renewal">
+      <span class="renewal-label">Insurance</span>
+      <span class="badge {{ renewal_class(summary.insurance) }} {{ summary.insurance.status }}">{{ renewal_text(summary.insurance) }}</span>
+      <span class="muted">due {{ summary.insurance.due_date if summary.insurance.due_date else 'n/a' }}</span>
+    </div>
+  </div>
 </div>

app/templates/dashboard.html

@@ -47,6 +47,8 @@
       {% if s.bike.service_interval_miles %}
         <dt>Every</dt><dd>{{ s.bike.service_interval_miles | money }} mi</dd>
       {% endif %}
+      <dt>MOT</dt><dd><span class="badge {{ renewal_class(s.mot) }}">{{ renewal_text(s.mot) }}</span></dd>
+      <dt>Insurance</dt><dd><span class="badge {{ renewal_class(s.insurance) }}">{{ renewal_text(s.insurance) }}</span></dd>
       <dt>Records</dt><dd>{{ s.event_count }}</dd>
       <dt>Cost to date</dt><dd>{{ s.total_cost | money }}</dd>
     </dl>

app/templates/login.html

@@ -4,6 +4,7 @@
 <meta charset="utf-8">
 <meta name="viewport" content="width=device-width, initial-scale=1">
 <title>Log in - bike-admin</title>
+<link rel="icon" href="/static/favicon.svg" type="image/svg+xml">
 <link rel="stylesheet" href="/static/main.css">
 </head>
 <body class="auth">