Rework benchmark display

[jack-berg]

Rework benchmark display:

• Update to latest version of chart.js, 4.5.1
• Switched x-axis to a time scale (via Luxon adapter) for calendar-aligned weekly/monthly ticks
• Added a global date range picker (From / To / Reset) that filters all charts
• Replaced the built-in Chart.js legend with a custom per-chart scrollable, sorted, toggleable list with All/None buttons
• Added a [source] link per chart to the benchmark class on GitHub (main)
• Made data points clickable — opens the repo file tree at that commit SHA
• Formatted y-axis values, tooptips as 23.1M / 351k
• Shortened chart titles to simple class name; full FQCN on hover

Much more usable / useful experience.

Screenshot of new (existing for reference):

[jaydeluca]

big improvement 🎉