Wrap the county paths in a <g id="mapg"> and drive a translate/scale
transform from the mouse:
- scroll to zoom toward the cursor (1x-16x)
- drag to pan, clamped so the map can't leave the frame
- double-click to reset to the full view
County borders use vector-effect:non-scaling-stroke so they stay crisp
at every zoom level instead of thickening. The existing hover readout and
click-to-open county sheet keep working through event delegation; the
click handler is guarded (dragMoved / e.detail) so a pan gesture or the
reset double-click never pops a county sheet.
Pure view interaction — no data touched. Safe against `make board`, which
only rewrites the D/CDETAIL/TOTALS data lines.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Fabio
77e7b4282e