feat: add travel and room alerts, live lesson notifications, and launcher shortcuts

- Implemented travel alerts for notifying about classes in another town the evening before.
- Added room alerts for notifying about room changes on the morning of the class.
- Introduced live lesson notifications to provide ongoing updates during classes.
- Created launcher shortcuts for quick access to today's schedule, weekly overview, search functionality, and adding new tasks.
- Updated settings to manage new notification preferences and integrated them into the user interface.
- Enhanced notification channels for better organization and user experience.

android/app/src/main/AndroidManifest.xml

@@ -6,6 +6,8 @@
     <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
     <!-- Optional: the student can allow exact reminder times in system settings. -->
     <uses-permission android:name="android.permission.SCHEDULE_EXACT_ALARM" />
+    <!-- The lesson under way as a Live Update on Android 16 (a promoted ongoing notification). -->
+    <uses-permission android:name="android.permission.POST_PROMOTED_NOTIFICATIONS" />
 
     <application
         android:name=".ScheduleApp"
@@ -20,11 +22,16 @@
         <activity
             android:name=".MainActivity"
             android:exported="true"
+            android:launchMode="singleTop"
             android:windowSoftInputMode="adjustResize">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
+            <!-- Long press on the icon: today, the week, room search, a new task. -->
+            <meta-data
+                android:name="android.app.shortcuts"
+                android:resource="@xml/shortcuts" />
         </activity>
 
         <receiver
@@ -66,6 +73,14 @@
             android:name=".notify.ReminderReceiver"
             android:exported="false" />
 
+        <receiver
+            android:name=".notify.DayAlertReceiver"
+            android:exported="false" />
+
+        <receiver
+            android:name=".notify.LiveLessonReceiver"
+            android:exported="false" />
+
         <receiver
             android:name=".notify.BootReceiver"
             android:exported="true">