Add comprehensive reminder/alarm support to calendar events

- Backend: Parse VALARM components from CalDAV iCalendar data
- Backend: Add EventReminder struct with minutes_before, action, and description
- Backend: Support Display, Email, and Audio reminder types
- Backend: Parse ISO 8601 duration triggers (-PT15M, -P1D, etc.)
- Frontend: Add reminders field to CalendarEvent structure
- Frontend: Display reminders in event modal with human-readable formatting
- Frontend: Show reminder timing (15 minutes before, 1 day before) and action type
- Fix: Update Trunk.toml to properly copy CSS files to dist directory

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Trunk.toml

@@ -6,10 +6,14 @@ dist = "dist"
 BACKEND_API_URL = "http://localhost:3000/api"
 
 [watch]
-watch = ["src", "Cargo.toml"]
+watch = ["src", "Cargo.toml", "styles.css", "index.html"]
 ignore = ["backend/"]
 
 [serve]
 address = "127.0.0.1"
 port = 8080
-open = false
+open = false
+
+[[copy]]
+from = "styles.css"
+to = "dist/"