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Architecture
Time Tools is a static React/Vite application wrapped in the shared Toolbox shell. Its pure modules separate exact epoch parsing, named-zone resolution/transition inspection, calendar-versus-elapsed arithmetic, bounded recurrence preview, business-day calculation and UTC iCalendar generation.
temporal-polyfill supplies Temporal semantics while the browser runtime supplies IANA time-zone data. Croner handles explicitly selected 5/6/7-field cron syntax; rrule-temporal parses strict RFC 5545 recurrence rules with bounded iterations/candidate evaluations. iCalendar export resolves one named-zone wall time and writes escaped/folded UTC DTSTART/DTEND fields rather than an incomplete VTIMEZONE.
Version 0.1 operations are synchronous and bounded, so the app creates no worker and has no persistence or server API. Relative entry and asset URLs keep the build relocatable below a nested portal path.