Fix axis label formatting in seat activity scatterplot

[Copilot]

The scatterplot's axis labels had incorrect format strings: x-axis used '{value} m' (minutes) despite containing datetime timestamps, and y-axis used '{value} kg' (kilograms) for time saved data.

Changes

• X-axis: Set type: 'datetime' and removed the minutes format string to properly render timestamp data as dates
• Y-axis: Changed format from '{value} kg' to '{value} min' to match the time saved metric

xAxis: {
  type: 'datetime',  // Added - renders timestamps as formatted dates
  title: { text: 'Activity' },
  // Removed: labels: { format: '{value} m' }
},
yAxis: {
  title: { text: 'Time Saved' },
  labels: {
    format: '{value} min'  // Changed from '{value} kg'
  }
}

Addresses feedback from #237 (comment #2550768750).

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