Persist log entries and photos; stamp with GPS location

- LogbookStorage: Moshi-backed JSON persistence to getExternalFilesDir,
  photos saved to Pictures/Nav/ instead of cache
- LogbookRepository: file-backed replacement for in-memory store, loads
  saved entries on init so they survive app restarts
- VoiceLogViewModel: expose entries StateFlow, accept lat/lon in save()
- VoiceLogFragment: switch camera to TakePicture(Uri) via FileProvider for
  full-res photos; gallery copies content URI to persistent storage;
  passes current GPS position to save(); shows scrollable entries list
- MainViewModel: expose currentPosition StateFlow updated on each GPS fix
- AndroidManifest: add FileProvider for Pictures/Nav/ directory
- TripReportViewModel: updated to use LogbookRepository

https://claude.ai/code/session_01YUbuZNDAoLea4cf9UGQ9qn

1 files changed, 9 insertions, 0 deletions

diff --git a/android-app/app/src/main/AndroidManifest.xml b/android-app/app/src/main/AndroidManifest.xml
index 23817bb..1701e17 100644
--- a/android-app/app/src/main/AndroidManifest.xml
+++ b/android-app/app/src/main/AndroidManifest.xml
@@ -23,6 +23,15 @@
         <service
             android:name=".LocationService"
             android:foregroundServiceType="location" />
+        <provider
+            android:name="androidx.core.content.FileProvider"
+            android:authorities="${applicationId}.fileprovider"
+            android:exported="false"
+            android:grantUriPermissions="true">
+            <meta-data
+                android:name="android.support.FILE_PROVIDER_PATHS"
+                android:resource="@xml/file_paths" />
+        </provider>
         <activity
             android:name=".MainActivity"
             android:exported="true"