fix: resolve build errors and implement missing health data types

- Fix various build errors in the CLI application.
- Implement missing health data types (VO2 Max, Heart Rate Zones).
- Corrected `tablewriter` usage from `SetHeader` to `Header`.
- Removed unused imports and fixed syntax errors.

internal/utils/timeutils.go

@@ -2,6 +2,7 @@ package utils
 
 import (
 	"time"
+	"strconv"
 )
 
 var (
@@ -36,3 +37,29 @@ func ToLocalTime(utcTime time.Time) time.Time {
 func ToUTCTime(localTime time.Time) time.Time {
 	return localTime.UTC()
 }
+
+// parseAggregationKey is a helper function to parse aggregation key back to a time.Time object
+func ParseAggregationKey(key, aggregate string) time.Time {
+	switch aggregate {
+	case "day":
+		t, _ := time.Parse("2006-01-02", key)
+		return t
+	case "week":
+		year, _ := strconv.Atoi(key[:4])
+		week, _ := strconv.Atoi(key[6:])
+		t := time.Date(year, 1, 1, 0, 0, 0, 0, time.UTC)
+		// Find the first Monday of the year
+		for t.Weekday() != time.Monday {
+			t = t.AddDate(0, 0, 1)
+		}
+		// Add weeks
+		return t.AddDate(0, 0, (week-1)*7)
+	case "month":
+		t, _ := time.Parse("2006-01", key)
+		return t
+	case "year":
+		t, _ := time.Parse("2006", key)
+		return t
+	}
+	return time.Time{}
+}