Fix browser crash on signup rounds admin page #11178
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Fixes a browser crash that occurred when viewing the signup rounds admin page with a signup round that has a null start date. The crash was caused by an infinite re-render loop in the calendar preview component when earliestChange and latestChange were identical timestamps. This happened because: 1. MaximumEventSignupsPreview wasn't passing timezoneName to parseSignupRounds, causing timezone inconsistencies 2. ScheduledValuePreview didn't handle the case where there's only a single change point (not a time range) Changes: - MaximumEventSignupsPreview: Pass timezoneName to parseSignupRounds and include it in useMemo dependencies - ScheduledValuePreview: Add guard to skip calendar rendering when earliestChange === latestChange Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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Summary
Fixes a browser crash that occurred when viewing the signup rounds admin page with a signup round that has a null start date.
Problem
The browser tab would completely crash when navigating to
/signup_rounds, making the page completely inaccessible. This was reproducible on alarpfestival2026 development environment.Root Cause
The crash was caused by an infinite re-render loop in the
ScheduledValuePreviewcalendar component. When a signup round hasstart: null, the calendar preview would calculate that bothearliestChangeandlatestChangewere the same timestamp (the only finish date in the data). This caused the component to continuously re-render, eventually crashing the browser tab.Additionally,
MaximumEventSignupsPreviewwasn't passingtimezoneNametoparseSignupRounds, which could cause timezone inconsistencies.Changes
timezoneNametoparseSignupRoundsand include it inuseMemodependenciesearliestChange === latestChange(single point in time rather than a range)Test Plan
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