Fix sparse FSD drive detail attribution

Expand the drive detail FSD insights range to look around 24 hours so sparse counter bookends are included, preventing unknown/blank attribution for valid deltas. Adds backend and frontend regression coverage for the wider range behavior.

Author: atulmgupta

internal/api/fsd/drive_aggregate_test.go

@@ -101,6 +101,46 @@ func TestBuildDriveAnalytics_AttributesSynchronizedEvidenceToOneDrive(t *testing
 	}
 }
 
+func TestBuildDriveAnalytics_DriveDetailLookaroundIncludesSparseBookend(t *testing.T) {
+	// Drive detail queries ±24h so previous.StartAt is before the last FSD
+	// tick. A ±2 minute window left that bookend unattributed and the panel blank.
+	start := at(t, "2026-03-02T12:18:00Z")
+	end := at(t, "2026-03-04T12:30:00Z")
+	driveStart := at(t, "2026-03-03T12:18:00Z")
+	driveEndAt := at(t, "2026-03-03T12:30:00Z")
+	distance := 6300.0
+	samples := []Sample{
+		trustedSample(SignalFSDDistance, at(t, "2026-03-03T09:00:00Z"), 10000),
+		trustedSample(SignalDrivingDistance, at(t, "2026-03-03T09:00:00Z"), 50000),
+		trustedSample(SignalFSDDistance, at(t, "2026-03-03T12:28:00Z"), 14500),
+		trustedSample(SignalDrivingDistance, at(t, "2026-03-03T12:28:00Z"), 56300),
+	}
+	current := responseForRange(7, start, end, samples)
+	previous := responseForRange(7, start.Add(-end.Sub(start)), start, samples)
+
+	analytics := BuildDriveAnalytics(current, previous, AnalyticsInput{
+		CounterSamples: samples,
+		Drives: []DriveRecord{{
+			ID:        350,
+			StartedAt: driveStart,
+			EndedAt:   &driveEndAt,
+			DistanceM: &distance,
+		}},
+	}, time.UTC, true)
+
+	if len(analytics.ContributingDrives) != 1 {
+		t.Fatalf("drives = %d, want 1", len(analytics.ContributingDrives))
+	}
+	drive := analytics.ContributingDrives[0]
+	if drive.Confidence != ConfidenceEstimated {
+		t.Errorf("confidence = %q, want estimated", drive.Confidence)
+	}
+	wantMeasured(t, drive.FSDDistanceM, 4500, "lookaround FSD distance")
+	if len(drive.Evidence) == 0 {
+		t.Fatal("evidence is empty; drive detail would show no positive counter increase")
+	}
+}
+
 func TestBuildDriveAnalytics_SparseIntervalAcrossDrivesIsAmbiguous(t *testing.T) {
 	start := at(t, "2026-03-03T08:00:00Z")
 	end := at(t, "2026-03-03T13:00:00Z")

web/src/features/driving/pages/DriveDetailPage.test.tsx

@@ -494,8 +494,8 @@ describe('DriveDetailPage', () => {
     expect(screen.getByTestId('ai-coaching')).toHaveAttribute('data-drive-id', '42')
     expect(useFsdInsightsRangeMock).toHaveBeenCalledWith(
       '1',
-      '2025-03-01T09:58:00.000Z',
-      '2025-03-01T10:47:00.001Z',
+      '2025-02-28T10:00:00.000Z',
+      '2025-03-02T10:45:00.001Z',
       expect.any(String),
       true,
     )

web/src/features/driving/pages/DriveDetailPage.tsx

@@ -60,12 +60,18 @@ export default function DriveDetailPage() {
     if (!Number.isFinite(startMs) || !Number.isFinite(endMs)) {
       return { start: undefined, end: undefined };
     }
+    // SelfDrivingMilesSinceReset is sparse. A ±2 minute window only served
+    // the two-minute coverage-anchor and dropped the bookend samples that
+    // actually close a drive's delta — drive detail then rendered Unknown
+    // with "No positive counter increase". Look around far enough to load
+    // those bookends and any intervening drives (so overlap stays honest).
+    const lookaroundMs = 24 * 60 * 60 * 1000;
     return {
-      start: new Date(startMs - 2 * 60_000).toISOString(),
+      start: new Date(startMs - lookaroundMs).toISOString(),
       // The endpoint is half-open. One extra millisecond admits an anchor
       // exactly at the backend's two-minute coverage limit; later anchors
       // are still rejected by the attribution guard.
-      end: new Date(endMs + 2 * 60_000 + 1).toISOString(),
+      end: new Date(endMs + lookaroundMs + 1).toISOString(),
     };
   }, [drive]);
   const fsdQuery = useFsdInsightsRange(