Round 2: body battery redesign, profile cleanup, segment integration, route/segment records

- Body battery: replace circular ring with compact full-height colored bar chart,
  level as line overlay, legend shows only types present in data
- Dashboard: add mini body battery summary card above health today panel
- Profile: remove editable resting HR and manual weight log; show 7-day avg
  resting HR and latest Garmin weight as read-only
- Backend: add GET /routes/{id}/segment-bests bulk endpoint (fetches all matched
  activity data points in one query, computes best segment time per segment)
- Backend: add GET /records/routes for fastest activity per named route
- Routes page: add Segments panel to route detail (grouped as 1km splits vs
  hills/turns, best times, delete, theoretical best)
- Activity detail page: show segment times computed client-side from data points,
  🏆 badge if new best
- Records page: add Route Records and Segment Records tabs alongside Distance PRs

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/api/records.py

@@ -44,6 +44,35 @@ async def list_records(
     return result.scalars().all()
 
 
+@router.get("/routes")
+async def route_records(
+    db: AsyncSession = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    """Fastest activity per named route (course records)."""
+    from sqlalchemy import text
+    rows = await db.execute(
+        text("""
+            SELECT DISTINCT ON (nr.id)
+              nr.id       AS route_id,
+              nr.name     AS route_name,
+              nr.sport_type,
+              nr.distance_m,
+              a.id        AS activity_id,
+              a.name      AS activity_name,
+              a.duration_s,
+              a.start_time,
+              a.avg_speed_ms
+            FROM named_routes nr
+            JOIN activities a ON a.named_route_id = nr.id AND a.user_id = nr.user_id
+            WHERE nr.user_id = :uid AND a.duration_s IS NOT NULL
+            ORDER BY nr.id, a.duration_s ASC
+        """),
+        {"uid": current_user.id},
+    )
+    return [dict(r._mapping) for r in rows]
+
+
 @router.get("/history/{distance_label}")
 async def record_history(
     distance_label: str,