Sprint 46: Polish standings signals

[KevinBigham]

Summary

• Adds tokenized standings signal SVGs for hot/cold streaks, playoff seed state, and division leaders.
• Threads the signals into the existing LeagueStandings table cells without changing selectors, sorting, or engine data.
• Converts touched standings colors to --mfd-* tokens to keep Sprint 46 UI token discipline.

Save schema impact
None. SAVE_VERSION remains 35; packages/engine/** has 0 changed files.

How to test

• NODE_OPTIONS=--no-experimental-webstorage npx --yes pnpm@9.15.9 -r typecheck
• NODE_OPTIONS=--no-experimental-webstorage npx --yes pnpm@9.15.9 test
• NODE_OPTIONS=--no-experimental-webstorage npx --yes pnpm@9.15.9 --filter @mfd/web build
• bash scripts/check-bundle-size.sh
• bash scripts/check-math-random.sh

Expected: typecheck/test/build pass; @mfd/web build index gzip is 172.67 KB; check-bundle-size reports engine gzip 257 KB; check-math-random passes.

Risks / handoff for Claude Code

• Seed state uses existing playoffPicture data: top 3 or X/Y indicators render locked, seeds 4-7 render bubble, and non-seeded standings rows render out.
• PixelTable does not expose row styling hooks, so the division-leader trim is applied inside the team cell wrapper while preserving row behavior.

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