v1.7: fix widget losing data after screen lock/reboot

Two root causes:
- Alarms don't survive reboot — BootReceiver now restarts alarm + triggers
  an immediate fetch on BOOT_COMPLETED
- onUpdate() drew from cached prefs but never fetched fresh data — now
  triggers an immediate refresh so the widget is live on every launcher redraw

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

app/src/main/AndroidManifest.xml

@@ -43,6 +43,14 @@
             android:name=".AlarmReceiver"
             android:exported="false" />
 
+        <receiver
+            android:name=".BootReceiver"
+            android:exported="false">
+            <intent-filter>
+                <action android:name="android.intent.action.BOOT_COMPLETED" />
+            </intent-filter>
+        </receiver>
+
         <receiver
             android:name="androidx.work.impl.background.systemalarm.RescheduleReceiver"
             android:exported="false"