Name: GC HeartZones Accumulation
Author: bl4z

Track exactly how much time you spend in each heart rate zone, right on your Edge screen.

GC HeartZones Accumulation displays a live bar chart of your accumulated zone time during a ride — one bar per zone, growing in real time as you ride. The current zone is highlighted with a border, and a subtle arrow appears when you're within 5 bpm of crossing a boundary, so you always know which way you're trending.

**Features:**
- 5-zone bar chart with per-zone minute counters
- Live zone indicator with boundary proximity arrows
- 10-second progress segments within each bar
- Zone ranges shown below each bar
- Colour-coded by zone (blue → green → yellow → orange → red)
- Automatically loads your biking HR zones from Garmin Connect, falling back to generic zones or estimated max HR if not configured
- Resets cleanly on activity start; pausing freezes accumulation