Health hypnogram, routes tiles, BB bar chart, segment delta

- Sleep: store per-epoch stage timestamps in new sleep_stages JSON column;
  DailySnapshot now renders a proper 4-lane hypnogram (Awake/REM/Light/Deep)
  instead of the old proportional flat bar
- Body battery: replace grey background bars + white line with per-minute bars
  coloured by inferred type (sleep=indigo, rest=teal, active=orange, stable=grey)
  derived from sleep window + battery direction; Y-axis fixed 0-100
- Routes: convert sidebar list to tile grid sorted by most completions; tiles
  colour-bordered by sport type (blue=running, orange=cycling); completion count
  shown on each tile; detail panel displays below the grid when a tile is clicked
- Segments on activity detail: add column headers (This run / Best / Δ) and
  show signed time delta vs best, green when faster, red when slower

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

backend/app/workers/tasks.py

@@ -229,12 +229,12 @@ def parse_wellness_fit(file_path: str, user_id: int):
                     avg_stress, spo2_avg, hrv_nightly_avg, hrv_5min_high, hrv_status,
                     steps, floors_climbed, active_calories, total_calories,
                     sleep_duration_s, sleep_deep_s, sleep_light_s, sleep_rem_s, sleep_awake_s,
-                    sleep_score, sleep_start, sleep_end)
+                    sleep_score, sleep_start, sleep_end, sleep_stages)
                 VALUES (:user_id, :date, :resting_hr, :avg_hr, :max_hr,
                     :avg_stress, :spo2_avg, :hrv_avg, :hrv_high, :hrv_status,
                     :steps, :floors, :active_cal, :total_cal,
                     :sleep_dur, :sleep_deep, :sleep_light, :sleep_rem, :sleep_awake,
-                    :sleep_score, :sleep_start, :sleep_end)
+                    :sleep_score, :sleep_start, :sleep_end, :sleep_stages::json)
                 ON CONFLICT (user_id, date) DO UPDATE SET
                     resting_hr       = COALESCE(EXCLUDED.resting_hr, health_metrics.resting_hr),
                     avg_hr_day       = COALESCE(EXCLUDED.avg_hr_day, health_metrics.avg_hr_day),
@@ -255,7 +255,8 @@ def parse_wellness_fit(file_path: str, user_id: int):
                     sleep_awake_s    = COALESCE(EXCLUDED.sleep_awake_s, health_metrics.sleep_awake_s),
                     sleep_score      = COALESCE(EXCLUDED.sleep_score, health_metrics.sleep_score),
                     sleep_start      = COALESCE(EXCLUDED.sleep_start, health_metrics.sleep_start),
-                    sleep_end        = COALESCE(EXCLUDED.sleep_end, health_metrics.sleep_end)
+                    sleep_end        = COALESCE(EXCLUDED.sleep_end, health_metrics.sleep_end),
+                    sleep_stages     = COALESCE(EXCLUDED.sleep_stages, health_metrics.sleep_stages)
             """), {
                 "user_id": user_id, "date": date_dt,
                 "resting_hr": data.get("resting_hr"),
@@ -278,6 +279,7 @@ def parse_wellness_fit(file_path: str, user_id: int):
                 "sleep_score": data.get("sleep_score"),
                 "sleep_start": data.get("sleep_start"),
                 "sleep_end": data.get("sleep_end"),
+                "sleep_stages": __import__('json').dumps(data.get("sleep_stages")) if data.get("sleep_stages") else None,
             })
         db.commit()