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/config.py

@@ -31,6 +31,13 @@ class Settings(BaseSettings):
     # Service hint: flag a bike as "book soon" when it is this close to due.
     service_due_soon_miles: int = 200
 
+    # Renewal hint: flag MOT/insurance as "due soon" when it falls due within
+    # this many days (default 60 days).
+    renewal_due_soon_days: int = 60
+
+    # Months a logged MOT/insurance event is valid before it falls due.
+    renewal_months: int = 12
+
     # Event types (preset)
     event_types: list[str] = [
         "service",
@@ -39,6 +46,8 @@ class Settings(BaseSettings):
         "chain",
         "brake",
         "repair",
+        "mot",
+        "insurance",
         "other",
     ]