Dedup Garmin data storage, configurable chart colors, taxonomy fixes, sync/progression fixes

- Remove duplicated Garmin fields from storage; decode display-only fields
  (activity name/type, lap duration/HR, structured workout raw JSON) from
  RawJSON at API-response time instead of storing redundant columns
- Add a fully configurable chart color system (pace/HR main-line colors, 4
  effort-kind colors, tint/darken/brighten intensity knobs) under Profile >
  Chart colors
- Rename training types and fix their display order (Easy, Long, 60'/30'
  Threshold, Tempo, Intervals, MAS Test, Race) everywhere they're listed
- Add an Efficiency Factor progression metric; fix Progression chart axes to
  use tight non-zero-based domains, m:ss/km pace formatting, and rounded
  ticks instead of raw floating-point labels
- Expose the raw get_workout_by_id() payload in the raw-data viewer
  alongside activity/lap/detail JSON; enlarge the modal and shrink array
  indentation for readability
- Fix "last sync" reporting a meaningless activity count: record one
  combined sync run per manual "Sync now" and count genuinely new
  activities instead of re-listing whatever Garmin returned for the queried
  window
- Let a Review Queue activity be manually cleared back to Unclassified, and
  make "Reset all" available even while disconnected from Garmin

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

backend/internal/garmin/client.go

@@ -244,10 +244,23 @@ func (c *mcpClient) GetActivitySplits(ctx context.Context, activityID int64) (Ac
 		return ActivitySplits{}, err
 	}
 
-	var splits ActivitySplits
-	if err := json.Unmarshal([]byte(msg), &splits); err != nil {
+	var envelope struct {
+		ActivityID int64             `json:"activityId"`
+		Laps       []json.RawMessage `json:"lapDTOs"`
+	}
+	if err := json.Unmarshal([]byte(msg), &envelope); err != nil {
 		return ActivitySplits{}, fmt.Errorf("get_activity_splits did not return valid JSON (%q): %w", truncate(msg, 200), err)
 	}
+
+	splits := ActivitySplits{ActivityID: envelope.ActivityID, Laps: make([]Lap, 0, len(envelope.Laps))}
+	for _, raw := range envelope.Laps {
+		var l Lap
+		if err := json.Unmarshal(raw, &l); err != nil {
+			return ActivitySplits{}, fmt.Errorf("parse lap: %w", err)
+		}
+		l.Raw = raw
+		splits.Laps = append(splits.Laps, l)
+	}
 	return splits, nil
 }
 
@@ -269,6 +282,7 @@ func (c *mcpClient) GetActivityDetails(ctx context.Context, activityID int64) (A
 	if err := json.Unmarshal([]byte(msg), &details); err != nil {
 		return ActivityDetails{}, fmt.Errorf("get_activity_details did not return valid JSON (%q): %w", truncate(msg, 200), err)
 	}
+	details.Raw = json.RawMessage(msg)
 	return details, nil
 }
 
@@ -290,6 +304,7 @@ func (c *mcpClient) GetWorkoutByID(ctx context.Context, workoutID int64) (Workou
 	if err := json.Unmarshal([]byte(msg), &workout); err != nil {
 		return Workout{}, fmt.Errorf("get_workout_by_id did not return valid JSON (%q): %w", truncate(msg, 200), err)
 	}
+	workout.Raw = json.RawMessage(msg)
 	return workout, nil
 }