📦(front) add CalDAV and ICS dependencies
Add tsdav, ical.js, ts-ics and related libraries for CalDAV protocol support and ICS file handling. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Add tsdav, ical.js, ts-ics and related libraries for CalDAV protocol support and ICS file handling. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>