Implement custom reminders with multiple VAlarms per event

Major Features:
- Replace single ReminderType enum with Vec<VAlarm> throughout stack
- Add comprehensive alarm management UI with AlarmList and AddAlarmModal components
- Support relative (15min before, 2hrs after) and absolute (specific date/time) triggers
- Display reminder icons in both month and week calendar views
- RFC 5545 compliant VALARM implementation using calendar-models library

Frontend Changes:
- Create AlarmList component for displaying configured reminders
- Create AddAlarmModal with full alarm configuration (trigger, timing, description)
- Update RemindersTab to use new alarm management interface
- Replace old ReminderType dropdown with modern multi-alarm system
- Add reminder icons to event displays in month/week views
- Fix event title ellipsis behavior in week view with proper CSS constraints

Backend Changes:
- Update all request/response models to use Vec<VAlarm> instead of String
- Remove EventReminder conversion logic, pass VAlarms directly through
- Maintain RFC 5545 compliance for CalDAV server compatibility

UI/UX Improvements:
- Improved basic details tab layout (calendar/repeat side-by-side, All Day checkbox repositioned)
- Simplified reminder system to single notification type for user clarity
- Font Awesome icons throughout instead of emojis for consistency
- Clean modal styling with proper button padding and hover states
- Removed non-standard custom message fields for maximum CalDAV compatibility

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

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

backend/src/handlers/events.rs

@@ -522,19 +522,8 @@ pub async fn create_event(
             .collect()
     };
 
-    // Parse alarms - convert from minutes string to EventReminder structs
-    let alarms: Vec<crate::calendar::EventReminder> = if request.reminder.trim().is_empty() {
-        Vec::new()
-    } else {
-        match request.reminder.parse::<i32>() {
-            Ok(minutes) => vec![crate::calendar::EventReminder {
-                minutes_before: minutes,
-                action: crate::calendar::ReminderAction::Display,
-                description: None,
-            }],
-            Err(_) => Vec::new(),
-        }
-    };
+    // Use VAlarms directly from request (no conversion needed)
+    let alarms = request.alarms;
 
     // Check if recurrence is already a full RRULE or just a simple type
     let rrule = if request.recurrence.starts_with("FREQ=") {
@@ -645,21 +634,7 @@ pub async fn create_event(
     event.categories = categories;
     event.rrule = rrule;
     event.all_day = request.all_day;
-    event.alarms = alarms
-        .into_iter()
-        .map(|reminder| VAlarm {
-            action: AlarmAction::Display,
-            trigger: AlarmTrigger::Duration(chrono::Duration::minutes(
-                -reminder.minutes_before as i64,
-            )),
-            duration: None,
-            repeat: None,
-            description: reminder.description,
-            summary: None,
-            attendees: Vec::new(),
-            attach: Vec::new(),
-        })
-        .collect();
+    event.alarms = alarms;
     event.calendar_path = Some(calendar_path.clone());
 
     // Create the event on the CalDAV server

backend/src/models.rs

@@ -3,6 +3,7 @@ use axum::{
     response::{IntoResponse, Response},
     Json,
 };
+use calendar_models::VAlarm;
 use serde::{Deserialize, Serialize};
 
 // API request/response types
@@ -113,7 +114,7 @@ pub struct CreateEventRequest {
     pub organizer: String,             // organizer email
     pub attendees: String,             // comma-separated attendee emails
     pub categories: String,            // comma-separated categories
-    pub reminder: String,              // reminder type
+    pub alarms: Vec<VAlarm>,           // event alarms
     pub recurrence: String,            // recurrence type
     pub recurrence_days: Vec<bool>,    // [Sun, Mon, Tue, Wed, Thu, Fri, Sat] for weekly recurrence
     pub calendar_path: Option<String>, // Optional - use first calendar if not specified
@@ -144,7 +145,7 @@ pub struct UpdateEventRequest {
     pub organizer: String,             // organizer email
     pub attendees: String,             // comma-separated attendee emails
     pub categories: String,            // comma-separated categories
-    pub reminder: String,              // reminder type
+    pub alarms: Vec<VAlarm>,           // event alarms
     pub recurrence: String,            // recurrence type
     pub recurrence_days: Vec<bool>,    // [Sun, Mon, Tue, Wed, Thu, Fri, Sat] for weekly recurrence
     pub recurrence_interval: Option<u32>, // Every N days/weeks/months/years
@@ -181,7 +182,7 @@ pub struct CreateEventSeriesRequest {
     pub organizer: String,    // organizer email
     pub attendees: String,    // comma-separated attendee emails
     pub categories: String,   // comma-separated categories
-    pub reminder: String,     // reminder type
+    pub alarms: Vec<VAlarm>,  // event alarms
 
     // Series-specific fields
     pub recurrence: String, // recurrence type (daily, weekly, monthly, yearly)
@@ -219,7 +220,7 @@ pub struct UpdateEventSeriesRequest {
     pub organizer: String,    // organizer email
     pub attendees: String,    // comma-separated attendee emails
     pub categories: String,   // comma-separated categories
-    pub reminder: String,     // reminder type
+    pub alarms: Vec<VAlarm>,  // event alarms
 
     // Series-specific fields
     pub recurrence: String, // recurrence type (daily, weekly, monthly, yearly)