fix: send host confirmation email when approving pending bookings

Both confirm_booking (dashboard) and approve_booking_by_token (email link)
were only sending the guest a confirmation email but never notifying the
host. The host now receives a "New booking" email with ICS attachment
after approving a pending booking.

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

Author: olivierlambert

src/web/mod.rs

@@ -1417,6 +1417,9 @@ async fn confirm_booking(
             guest_cancel_url.as_deref(),
         )
         .await;
+
+        // Also send host a confirmation email with ICS attachment
+        let _ = crate::email::send_host_notification(&smtp_config, &details).await;
     }
 
     Redirect::to("/dashboard/bookings").into_response()
@@ -6886,6 +6889,9 @@ async fn approve_booking_by_token(
             guest_cancel_url.as_deref(),
         )
         .await;
+
+        // Also send host a confirmation email with ICS attachment
+        let _ = crate::email::send_host_notification(&smtp_config, &details).await;
     }
 
     let tmpl = match state.templates.get_template("booking_approved.html") {