Addresses feedback that a lone bar conveyed nothing. Rewrite WeeklyDistanceChart
as a proper SVG chart:
- y-scale topped at the busiest week with 0 / half / peak gridlines + km labels;
- faint per-week track columns so the 12-week axis is always visible (empty
weeks read as gaps, not nothing — no more floating bar);
- oldest→newest date bounds on the x-axis;
- a hover readout naming the week + its distance ("Week of {{date}} · X km").
i18n adds profileStats.weekOf. Component test updated for the SVG structure
(bar per non-zero week, peak-topped scale, hover readout). typecheck + lint +
unit (journal 322) green; verified in the browser.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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