Add bracket predictions, sharing, and leaderboard#29

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sergical wants to merge 6 commits intomainfrom

sergical/bracket-picking

Commits on Feb 1, 2026

Add bracket picking feature with predictions, sharing, and admin tools

sergical
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claude
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Revert ROUND_GAP to 220px for proper bracket spacing

sergical
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claude
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Refactor predictions state to use React context

sergical
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claude
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Fix players showing grayscale when Show My Picks is OFF

sergical
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claude
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Fix players showing grayscale when no picks exist

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claude
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Return basic OG image instead of errors for missing/unlocked brackets

sergical
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claude
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