v0.2.3 — calendar ICS fix

Fix DTSTART;TZID=... and DTSTART;VALUE=DATE never parsed — ics_props stored full DTSTART;TZID=... key so props.get("DTSTART") missed, and parse_dtstart expected DTSTART:... prefix (src/services/calendar.rs:260/292). Your private https://calendar.google.com/calendar/ical/.../basic.ics at ~/.config/naarchy/config.toml:37 now shows Monday Sales Huddle Meeting at 10:00 today (was 0 events). Also /tmp/debug_fixed now parses 1.