UI-07: rebuild Rides History with search, activity filter, and real ride thumbnails

Restyles TripsScreen toward Map HUD's GlassPanel language: a search bar and
activity-filter dropdown, four distinct summary stat cards (replacing the
mockup's four-identical-cards artifact), and per-ride RideMap thumbnails
showing each ride's own recorded path instead of stock photos.

RideHistorySummary is a pure function rather than a provider, since folding
over an already-fetched trip list is cheap regardless of history length, and
it makes the aggregation directly unit-testable. Average speed is
distance-weighted across the whole history rather than averaging each ride's
own average.

Adds a showAttribution flag to RideMap (default true) to suppress the
TileAttribution control on tiny list thumbnails, where it was both a UX
problem and a test collision with each card's own activity icon.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012Xki7YAcc2TiN2PRZJ2tXr

test/ride_history_summary_test.dart

@@ -0,0 +1,43 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:rippr/src/domain/models.dart';
+import 'package:rippr/src/ui/trips/trips_screen.dart';
+
+/// UI-07: `RideHistorySummary.compute` is a pure function specifically so it can be
+/// tested directly against a hand-computed total, rather than through a screen.
+void main() {
+  test('compute matches a hand-computed total over a fixed set of trips', () {
+    final trips = [
+      const Trip(
+        id: 1,
+        startedAt: 0,
+        endedAt: 3600000,
+        distanceM: 20000,
+        movingMillis: 3600000,
+      ),
+      const Trip(
+        id: 2,
+        startedAt: 0,
+        endedAt: 1800000,
+        distanceM: 5000,
+        movingMillis: 1800000,
+      ),
+    ];
+
+    final summary = RideHistorySummary.compute(trips);
+
+    expect(summary.rideCount, 2);
+    expect(summary.totalDistanceM, 25000);
+    expect(summary.totalMovingMillis, 5400000);
+    // Distance-weighted, not an average of each ride's own average: 25 km over 1.5 h.
+    expect(summary.avgSpeedKmh, closeTo(25 / 1.5, 0.0001));
+  });
+
+  test('an empty history has zero average speed, not a division error', () {
+    final summary = RideHistorySummary.compute(const []);
+
+    expect(summary.rideCount, 0);
+    expect(summary.totalDistanceM, 0);
+    expect(summary.totalMovingMillis, 0);
+    expect(summary.avgSpeedKmh, 0);
+  });
+}