Fix Android image share workflow and add local plugin persistence

- Add SafeArea and SharedImage plugins to capacitor.plugins.json
- Create restore-local-plugins.js to persist plugins after cap sync
- Integrate plugin restoration into build scripts
- Improve Android share intent timing with retry logic
- Clean up debug logging while keeping essential error handling
- Add documentation for local plugin management

Fixes issue where SharedImage plugin wasn't recognized, causing
"UNIMPLEMENTED" errors. Image sharing now works correctly on Android.

scripts/build-android.sh

@@ -385,6 +385,7 @@ fi
 if [ "$SYNC_ONLY" = true ]; then
     log_info "Sync-only mode: syncing with Capacitor"
     safe_execute "Syncing with Capacitor" "npx cap sync android" || exit 6
+    safe_execute "Restoring local plugins" "node scripts/restore-local-plugins.js" || exit 7
     log_success "Sync completed successfully!"
     exit 0
 fi
@@ -472,6 +473,9 @@ fi
 # Step 8: Sync with Capacitor
 safe_execute "Syncing with Capacitor" "npx cap sync android" || exit 6
 
+# Step 8.5: Restore local plugins (capacitor.plugins.json gets overwritten by cap sync)
+safe_execute "Restoring local plugins" "node scripts/restore-local-plugins.js" || exit 7
+
 # Step 9: Generate assets
 safe_execute "Generating assets" "npx capacitor-assets generate --android" || exit 7