Board: add a partisan-lean lens

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Fourth lens on the Board, coloring each county by the D/R balance of the
state + federal representatives who cover it — the offices that are
actually partisan (99% D/R coverage vs ~0% for nonpartisan local seats).

Pipeline (build_viz.py):
- Carry each district rep's party alongside their name through the
  county<->district edge mapping.
- Per county, tally reps by party over districts covering >=5% of its
  area (slivers excluded), and store lean = (R-D)/(R+D) in [-1,+1] plus
  repD/repR counts. Head-count, not area-weighted, so the number matches
  the readout and isn't skewed toward large rural districts. 3130/3131
  counties resolve.

Board (board.html):
- "Partisan lean" lens with a diverging blue<->grey<->red ramp (centered
  at 0, skipped in the percentile-rank machinery the other lenses use).
- Diverging legend (More Democratic / More Republican).
- Readout gains a Representation row (e.g. "8 D · 3 R  D+45").
- Drill-down district reps get a D/R party badge.

Verified in preview: no console errors; Manhattan -1.0 (21D/0R), LA -0.46,
Palm Beach even (3D/3R), Loving TX +1.0; readout, color, and badges agree.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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This commit is contained in:

Fabio

2026-07-06 08:59:51 -04:00

parent 77e7b4282e

commit 802c49a89d

4 changed files with 57 additions and 11 deletions

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viz/board.html

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viz/county_data.json

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viz/county_detail.json

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