feat(reports,settings,docs): server-side PDF export, cutoff date picker, and UI refinements

- Reports: Migrate DepEd Transparency Board PDF export to backend Puppeteer service with enlarged layout and per-section downloads

- Settings: Replace dynamic grace period days input with cutoff date picker and calculated days preview; separate schedule date pickers

- Documents: Default requirements section to collapsed/closed state in upload OCR modal with pulsing border container

- Fix contrast on Auto-Graduation trigger button and ensure desktop responsiveness across report buttons

frontend/android/app/src/main/AndroidManifest.xml

@@ -24,6 +24,9 @@
         android:label="TIS RMS"
         android:name="${applicationName}"
         android:icon="@mipmap/ic_launcher">
+        <meta-data
+            android:name="com.google.mlkit.vision.DEPENDENCIES"
+            android:value="document_scanner" />
         <meta-data
             android:name="com.pravera.flutter_foreground_task.notification_icon"
             android:resource="@mipmap/ic_launcher" />