* Fix MLB streak doubling bug, hide empty standings columns, improve mobile layout
- mlb.ts: use streakCode alone (the API already returns the full string like
"W3"); appending streakNumber was doubling the digit, causing "L33" display
- Update mlb.test.ts mocks to match real API format (streakCode "W3" not "W")
- RegularSeasonStandings: conditionally hide GB/L10/STK columns when no rows
have data, so pre-season or stats-free sports don't show blank columns
- Mobile two-row layout: GP/PCT/GB/L10 move to a secondary sub-row (sm:hidden)
so all data stays visible without horizontal scroll on small screens; STK and
W/L remain on the primary row; reduce min-w from 740px to 360px
https://claude.ai/code/session_01RADi3LhYMPbRDm5no1ZpdF
* Address code review: cleanup mlb streak type, fix soccer GP on mobile, hoist showSubRow
- mlb.ts: drop redundant `?? undefined` after optional chain; document that
streakCode is the full string (e.g. "W3") and streakNumber is unused
- RegularSeasonStandings: hoist hasSecondaryStats → showSubRow to component
level (it only depends on a prop, not on individual row data)
- Remove non-functional `truncate`/`min-w-0` from team name cell — truncation
requires table-layout:fixed which we don't use; team names size naturally
- Soccer GP was hidden on mobile with no sub-row to surface it; GP now shows
inline for soccer on all viewports, hidden only for non-soccer (which has
the secondary sub-row)
- Add comment explaining totalCols counts hidden-on-mobile columns for colSpan
- Add missing test for GB column hiding when no rows have gamesBack data
https://claude.ai/code/session_01RADi3LhYMPbRDm5no1ZpdF
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Co-authored-by: Claude <noreply@anthropic.com>
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