Extract all settings sections from the monolithic 1009-line route file into
individual components under app/components/league/settings/. Route file drops
to ~300 lines. Separates draft-order dirty state from general settings dirty
state, deduplicates section-change handling, and fixes several bugs found
during review (typo in pointsFor5th, wrong mock in tests, lint violations).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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