Rebuild Noo as a full Nextcloud client: auth, media, and Material You UI

Replaces the starter template with Login Flow v2 auth, WebDAV-backed
Files/Photos/Activity tabs, a swipeable media viewer with PDF/text/video
preview, Material You dynamic theming, a frosted-glass floating nav bar,
and a rebranded app icon/identity (com.example -> family.nasa).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

windows/flutter/generated_plugins.cmake

@@ -3,6 +3,12 @@
 #
 
 list(APPEND FLUTTER_PLUGIN_LIST
+  dynamic_color
+  file_saver
+  flutter_secure_storage_windows
+  pdfx
+  share_plus
+  url_launcher_windows
 )
 
 list(APPEND FLUTTER_FFI_PLUGIN_LIST