Description

Let users choose which leagues appear and in what order, instead of the hardcoded model.Leagues set. Persisted config (see config-persistence task).

Acceptance Criteria

• #1 user can enable/disable leagues
• #2 league order is user-configurable
• #3 choice persists across runs

Implementation Plan

1. config.Leagues = ordered ENABLED league IDs; empty = default (all, default order).
2. App holds effective leagues []model.League built by resolveLeagues(cfg.Leagues); replace all model.Leagues reads in ui (sections/views/ticker/commands/update/app) with a.leagues + a.leagueIndex().
3. fetchAll takes the league slice so only enabled leagues are polled.
4. New viewSettings mode: list all leagues (enabled then hidden), space toggles, K/J (shift+up/down) reorder enabled, esc closes+persists+refetches. Open with 'L'.
5. On close: drop filter if its league got disabled; clampCursor.
6. Order drives live/recent/upcoming + tabs automatically (already keyed off league order).
7. Tests: resolveLeagues, toggle, reorder, sort respects custom order.

Final Summary

Users can now select, hide, and reorder leagues; choice persists.

What changed:

• App holds an effective league set (App.leagues) built by resolveLeagues(config.Leagues). All view/fetch/sort paths (sections, tabs, ticker, fetchAll, leagueIndex) now iterate a.leagues instead of the hardcoded model.Leagues catalog.
• config.Leagues persists the ordered ENABLED league IDs; empty/nil (or all-unknown) means default = all leagues in catalog order. Disabling drops a league from views (cached games retained); enabling appends to the end. Last-enabled league can't be disabled.
• New settings screen (viewSettings / settings.go, opened with 'L'): lists enabled then hidden leagues; space toggles, K/J (shift+up/down) reorder the enabled group, esc closes -> persists, drops a now-disabled active filter, and refetches.
• League order is the single source of truth for both tab order and the live/recent/upcoming sort, so reordering NBA above World Cup makes NBA lead those views whenever it has games for the date.

Tests: resolveLeagues (default/subset+order/all-unknown fallback), setLeague toggle, moveLeague reorder+clamp, and a state-filter sort honoring custom league order. Existing all-leagues/ticker test fixtures updated to set leagues. go vet + go test ./... pass.