Fix next/prev lesson navigation always pointing to Welcome#5
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thomasahle merged 1 commit intothomasnormal:mainfrom Apr 7, 2026
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indexOf(lesson) used reference equality, but lesson is a spread copy created in +page.js, so it always returned -1. Use findIndex with slug matching instead. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
indexOf(lesson)used reference equality, butlessonis a spread copy created in+page.js({ ...lesson, ...content }), so it always returned-1— and-1 + 1 = 0resolved to the first lessonfindIndexusing slug matchingTest plan
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