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tiennm99
3e6cb90a08
Pull the bus-driven auto-tick effect body out of PlayerBoard.svelte
into `src/lib/auto-tick.js` so the dedup-by-`at` invariant — the one
that already caught a P0 — is unit-testable without mounting Svelte.
The effect is now a thin wrapper that calls `processAutoTick()` and
applies the returned `{crossed, lastHandledAt, changed}`.
8 vitest cases cover NEW draw, dedup on same `at`, re-cross after
manual untick, mode=master/player ignored (timestamp still advances),
off-board number, null lastDraw, and null grid.