Auto-discover iCloud calendars on startup when no saved tokens exist

Previously, after initial setup, iCloud CalDAV discovery only ran when
manually triggered with 'i'. This left users with no events until they
discovered that keybinding.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: sovanesyan

src/main.rs

@@ -155,6 +155,36 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
             });
         }
 
+    // Auto-discover iCloud calendars if configured but no saved tokens
+    if matches!(app.icloud_auth, ICloudAuthState::NotAuthenticated)
+        && let Some(ref icloud_config) = app.config.icloud
+        && !icloud_config.is_eventkit() {
+            app.icloud_auth = ICloudAuthState::Discovering;
+            let auth = ICloudAuth::new(icloud_config.clone());
+            let client = CalDavClient::new(auth);
+            let tx = tx.clone();
+            tokio::spawn(async move {
+                match client.discover_calendars().await {
+                    Ok(discovered) => {
+                        let calendars: Vec<CalendarEntry> = discovered
+                            .into_iter()
+                            .map(|c| CalendarEntry { url: c.url, name: c.name })
+                            .collect();
+                        if calendars.is_empty() {
+                            let _ = tx.send(AsyncMessage::ICloudDiscoveryError(
+                                "No calendars found".to_string()
+                            )).await;
+                        } else {
+                            let _ = tx.send(AsyncMessage::ICloudDiscovered { calendars }).await;
+                        }
+                    }
+                    Err(e) => {
+                        let _ = tx.send(AsyncMessage::ICloudDiscoveryError(e.to_string())).await;
+                    }
+                }
+            });
+        }
+
     // Enable raw mode and enter alternate screen
     enable_raw_mode()?;
     execute!(stdout(), EnterAlternateScreen, cursor::Hide)?;