feat(dev): Cron Expression tool - #160
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Adds a cron expression editor/explainer (like crontab.guru) to the Dev category. Pure client-side, zero new dependencies. - cron.lib.ts: 5-field parser, human-readable explainer, next-run calculator. Handles *, n, n-m, */n, a-b/n, a,b,c; normalises dow 7→0; DOM+DOW OR logic per unix cron spec. - CronExplainer.tsx: live-updating expression input with per-field labels, plain-English description, 13 presets, next-10-runs list. EN + ID. - 38 unit tests (parseField, parseCron, explainCron, matchesCron, nextRuns). - SEO content (EN + ID) in tool-seo.ts. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_013dqouzFP8vy9jaKhTDFj5H
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Summary
Test plan
* * * * *→ "Every minute"0 9 * * 1-5→ weekdays 09:00, correct next runs*/15 * * * *→ "Every 15 minutes", runs 15 min apart0 0 1 1 *→ "At 00:00, on the 1st of every month, in January"