[PRAC-259] Clarify learning chart units

[Kuba0517]

Summary by CodeRabbit

Release Notes

• New Features
  • Dashboard charts now support multiple metrics: learning time, XP, and task counts
  • Chart values automatically format based on your selected metric for proper display
  • Learning dashboard metric selector now properly syncs with chart visualization

[coderabbitai]

Caution

Review failed

The pull request is closed.

📝 Walkthrough

Walkthrough

The changes introduce metric selection support to the PlaceholderChart component. A new metric prop is added to the PlaceholderChart, a formatter function formatMetricValue converts values based on metric type, and the LearningDashboard wires the selected metric to the chart for display.

Changes

Cohort / File(s)	Summary
Chart Metric Support frontend/src/features/learning/dashboard/placeholder-chart.tsx	Added metric prop to PlaceholderChart with default value GetActivityChartMetric.LEARNING_TIME. Extended BarChartComponent to accept and utilize metric parameter. Introduced formatMetricValue(value, metric) formatter function to convert raw values to human-readable strings (sec/min/h, XP, or tasks) based on selected metric.
Metric Integration frontend/src/features/learning/my-learning/learning-dashboard.tsx	Passed selectedMetric state to PlaceholderChart component via new metric prop to align chart rendering with user's selected metric.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Poem

🐰 A metric so fine, now woven with care,
Charts shift their measure through the dashboard air,
Time, XP, tasks—each value glows bright,
The formatter hops, making all metrics just right! ✨

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