Improve HeatMap display

[MathijsR94]

Summary

• Filter out future weeks from the HeatMap so empty trailing columns aren't rendered
• Restructure tooltip handlers to use cached layout measurements instead of per-event getBoundingClientRect calls
• Add touch support (onTouchEnd) with toggle behavior and outside-tap dismissal
• Memoize cell rendering into a cells variable
• Add JSDoc to non-obvious interfaces and helpers

Test plan

• Verify HeatMap does not show empty columns for future weeks
• Hover cells on desktop — tooltip follows cursor and dismisses on mouse leave
• Click a cell — tooltip toggles on/off
• Tap a cell on mobile/touch device — tooltip toggles, tapping outside dismisses
• Resize the browser and confirm tooltip positioning remains accurate

[brdv]

Hmm not really sure how i feel about this. Somewhere i do like the empty cols when a whole year is rendered (For this year. Give you some sense of what's left.

Also, this only happens on 'this year' and custom dates into the future, right?

Maybe changing the default range to 'last 12' months, like GH does makes more sense?

[MathijsR94]

Hmm not really sure how i feel about this. Somewhere i do like the empty cols when a whole year is rendered (For this year. Give you some sense of what's left.

Also, this only happens on 'this year' and custom dates into the future, right?

Maybe changing the default range to 'last 12' months, like GH does makes more sense?

Fair! Changed the heatmap to show the empty cols too. And added the 'last 12 months' filter. Bonus: now Toolbar and SettingsDrawer share the same date preset selection and will change together.