Implement comprehensive frontend integration testing with Playwright

- Add Playwright E2E testing framework with cross-browser support (Chrome, Firefox)
- Create authentication helpers for CalDAV server integration
- Implement calendar interaction helpers with event creation, drag-and-drop, and view switching
- Add comprehensive drag-and-drop test suite with event cleanup
- Configure CI/CD integration with Gitea Actions for headless testing
- Support both local development and CI environments with proper dependency management
- Include video recording, screenshots, and HTML reporting for test debugging
- Handle Firefox-specific timing and interaction challenges with force clicks and timeouts

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

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

frontend/src/components/tests/calendar_tests.rs

@@ -0,0 +1,96 @@
+use wasm_bindgen_test::*;
+use chrono::{DateTime, Utc, TimeZone};
+use crate::components::{MonthView, WeekView};
+use crate::models::ical::VEvent;
+use yew::prelude::*;
+
+#[wasm_bindgen_test]
+fn month_view_renders_without_events() {
+    let props = yew::props!(
+        current_date: Utc.with_ymd_and_hms(2023, 12, 15, 0, 0, 0).unwrap(),
+        events: vec![],
+        on_event_click: Callback::noop(),
+        on_date_click: Callback::noop(),
+        on_event_drag: Callback::noop(),
+        visible_calendar_paths: vec![],
+    );
+
+    let _month_view = html! { <MonthView ..props /> };
+    
+    // Test passes if no panic occurs during rendering
+}
+
+#[wasm_bindgen_test]
+fn week_view_renders_without_events() {
+    let props = yew::props!(
+        current_date: Utc.with_ymd_and_hms(2023, 12, 15, 0, 0, 0).unwrap(),
+        events: vec![],
+        on_event_click: Callback::noop(),
+        on_event_drag: Callback::noop(),
+        visible_calendar_paths: vec![],
+    );
+
+    let _week_view = html! { <WeekView ..props /> };
+    
+    // Test passes if no panic occurs during rendering
+}
+
+#[wasm_bindgen_test]
+fn month_view_handles_events() {
+    // Create a test event
+    let mut test_event = VEvent::new("test-event-123".to_string());
+    test_event.summary = Some("Test Event".to_string());
+    test_event.dtstart = Some(Utc.with_ymd_and_hms(2023, 12, 15, 14, 0, 0).unwrap());
+    test_event.dtend = Some(Utc.with_ymd_and_hms(2023, 12, 15, 15, 0, 0).unwrap());
+
+    let props = yew::props!(
+        current_date: Utc.with_ymd_and_hms(2023, 12, 15, 0, 0, 0).unwrap(),
+        events: vec![test_event],
+        on_event_click: Callback::noop(),
+        on_date_click: Callback::noop(),
+        on_event_drag: Callback::noop(),
+        visible_calendar_paths: vec!["test-calendar".to_string()],
+    );
+
+    let _month_view = html! { <MonthView ..props /> };
+    
+    // Test passes if no panic occurs during rendering with events
+}
+
+#[wasm_bindgen_test]
+fn week_view_handles_events() {
+    // Create a test event
+    let mut test_event = VEvent::new("test-event-456".to_string());
+    test_event.summary = Some("Weekly Test Event".to_string());
+    test_event.dtstart = Some(Utc.with_ymd_and_hms(2023, 12, 15, 10, 0, 0).unwrap());
+    test_event.dtend = Some(Utc.with_ymd_and_hms(2023, 12, 15, 11, 30, 0).unwrap());
+
+    let props = yew::props!(
+        current_date: Utc.with_ymd_and_hms(2023, 12, 15, 0, 0, 0).unwrap(),
+        events: vec![test_event],
+        on_event_click: Callback::noop(),
+        on_event_drag: Callback::noop(),
+        visible_calendar_paths: vec!["test-calendar".to_string()],
+    );
+
+    let _week_view = html! { <WeekView ..props /> };
+    
+    // Test passes if no panic occurs during rendering with events
+}
+
+#[wasm_bindgen_test]
+fn event_time_calculations() {
+    // Test event duration calculation
+    let start_time = Utc.with_ymd_and_hms(2023, 12, 15, 10, 0, 0).unwrap();
+    let end_time = Utc.with_ymd_and_hms(2023, 12, 15, 11, 30, 0).unwrap();
+    
+    let duration = end_time - start_time;
+    assert_eq!(duration.num_minutes(), 90);
+    
+    // Test same-day event
+    assert_eq!(start_time.date_naive(), end_time.date_naive());
+    
+    // Test hour extraction
+    assert_eq!(start_time.hour(), 10);
+    assert_eq!(end_time.hour(), 11);
+}