Implement Standalone Android App via Flutter WebView

- Configured `vite.config.ts` for relative base path support.
- Initialized `mobile_app` Flutter project with `webview_flutter`.
- Added `assets/www` to Flutter assets configuration.
- Implemented `mobile_app/lib/main.dart` with WebView and Bridge API integration (Water Level Slider).
- Updated `.gitignore` for Flutter artifacts.
- Successfully built APK artifacts.

Co-authored-by: kliffdafunkfacekilla-arch <239708976+kliffdafunkfacekilla-arch@users.noreply.github.com>

mobile_app/assets/www/charges/crossedBones.svg

@@ -0,0 +1,7 @@
+<svg xmlns="http://www.w3.org/2000/svg" fill="#d7374a" stroke="#000" viewBox="50 50 200 200">
+<metadata source="https://commons.wikimedia.org/wiki/File:Coat_of_Arms_of_Spanish_Army_Paratrooper_Brigade_Anti-Tank_Defense_Company.svg" author="Heralder" license="https://creativecommons.org/licenses/by-sa/4.0"/>
+  <g id="crossedBones" stroke-width=".6">
+    <path d="m 64.5,110 c -3,1 -4,4 -2,6 3,0 2,5 5,6 4,-1 1,-5 10,-8 5,-3 10,-4 15,-6 A 704,704 0 0 0 126,90.6 c 2,-1.2 6,0.4 9,0 3,-0.8 5,-4.4 2,-6 -1,-1.2 1,-4 -1,-5.2 -1,-2.4 -4,-2 -6,0 -3,2 -2,4.4 -9,6.8 C 108,93 85.5,104 71.5,110 c -4,0 -6,-1 -7,0 z"/>
+    <path d="m 135,110 c 3,1 4,4 2,6 -3,0 -2,5 -5,6 -4,-1 -1,-5 -10,-8 -5,-3 -10,-4 -15,-6 A 704,704 0 0 1 74.1,90.6 c -2,-1.2 -6.4,0.4 -9.2,0 -2.8,-0.8 -4.4,-4.4 -1.6,-6.1 0.8,-1.2 -0.8,-4 0.8,-5.2 1.2,-2.3 4.4,-1.9 6,0 2.8,2 2.4,4.4 8.8,6.9 C 92.1,93 114,104 128,110 c 4,0 6,-1 7,0 z"/>
+  </g>
+</svg>