Optimize sync endpoint with batch operations and fix accessibility issues

[Copilot]

Addresses performance, testing, and accessibility issues in the fixture sync feature identified in code review.

Performance optimizations

• In-memory fixture lookup: Replace O(n) database queries in loop with O(1) Map lookup
• Batch database operations: Execute fixture updates, availability clears, and reinitialization atomically via D1 batch() API

// Before: 4+ sequential DB calls per changed fixture
await db.updateFixtureDate(id, date, time);
await db.clearAvailabilityForFixture(id);
await db.clearFinalSelections(id);
for (const player of players) {
  await db.createAvailability(id, player.id, false);
}

// After: Single batch operation
await db.batchUpdateFixture(id, date, time, playerIds);

Test improvements

• Replace arbitrary waitForTimeout() calls with semantic Playwright state checks (locator.waitFor())
• Remove unused syncingButton variable

Accessibility fixes

• Dialog backdrop: remove role="button" + tabindex="0", add role="presentation"
• Dialog keydown: allow Escape propagation for proper keyboard navigation

<!-- Before -->
<div role="button" tabindex="0" onkeydown={(e) => e.stopPropagation()}>

<!-- After -->
<div role="presentation" onkeydown={(e) => { if (e.key !== 'Escape') e.stopPropagation(); }}>

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