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/store/store_test.go

@@ -40,14 +40,11 @@ func TestUpsertActivity_InsertThenUpdateIsIdempotent(t *testing.T) {
 
 	a := Activity{
 		GarminActivityID: 23554066504,
-		ActivityName:     "Auriol - W2-5-Base Endurance",
-		ActivityType:     "running",
 		StartTimeUTC:     "2026-07-11 05:02:35",
-		BeginTimestampMs: 1783746155000,
 		DurationSeconds:  1800,
 		DistanceMeters:   6858,
 		AvgHR:            f(148),
-		RawJSON:          `{"activityId":23554066504}`,
+		RawJSON:          `{"activityId":23554066504,"activityName":"Auriol - W2-5-Base Endurance","activityType":{"typeKey":"running"}}`,
 	}
 
 	id, err := db.UpsertActivity(ctx, a)
@@ -87,7 +84,6 @@ func TestKindAssignment_AppendOnlyHistoryAndCurrentView(t *testing.T) {
 
 	activityID, err := db.UpsertActivity(ctx, Activity{
 		GarminActivityID: 1,
-		ActivityType:     "running",
 		StartTimeUTC:     "2026-07-11 05:00:00",
 		RawJSON:          "{}",
 	})
@@ -172,7 +168,6 @@ func TestReplaceLapsIsIdempotent(t *testing.T) {
 
 	activityID, err := db.UpsertActivity(ctx, Activity{
 		GarminActivityID: 2,
-		ActivityType:     "running",
 		StartTimeUTC:     "2026-07-11 05:00:00",
 		RawJSON:          "{}",
 	})
@@ -181,8 +176,8 @@ func TestReplaceLapsIsIdempotent(t *testing.T) {
 	}
 
 	laps := []Lap{
-		{LapIndex: 1, StartTimeUTC: "2026-07-11 05:00:00", DurationSeconds: 300, DistanceMeters: 1000, AvgHR: f(140), RawJSON: "{}"},
-		{LapIndex: 2, StartTimeUTC: "2026-07-11 05:05:00", DurationSeconds: 300, DistanceMeters: 1000, AvgHR: f(150), RawJSON: "{}"},
+		{LapIndex: 1, RawJSON: "{}"},
+		{LapIndex: 2, RawJSON: "{}"},
 	}
 	if err := db.ReplaceLaps(ctx, activityID, laps); err != nil {
 		t.Fatalf("ReplaceLaps (first): %v", err)