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/libs/tinymce/plugins/code/plugin.min.js

@@ -0,0 +1,4 @@
+/**
+ * TinyMCE version 7.1.0 (2024-05-08)
+ */
+!function(){"use strict";tinymce.util.Tools.resolve("tinymce.PluginManager").add("code",(e=>((e=>{e.addCommand("mceCodeEditor",(()=>{(e=>{const o=(e=>e.getContent({source_view:!0}))(e);e.windowManager.open({title:"Source Code",size:"large",body:{type:"panel",items:[{type:"textarea",name:"code"}]},buttons:[{type:"cancel",name:"cancel",text:"Cancel"},{type:"submit",name:"save",text:"Save",primary:!0}],initialData:{code:o},onSubmit:o=>{((e,o)=>{e.focus(),e.undoManager.transact((()=>{e.setContent(o)})),e.selection.setCursorLocation(),e.nodeChanged()})(e,o.getData().code),o.close()}})})(e)}))})(e),(e=>{const o=()=>e.execCommand("mceCodeEditor");e.ui.registry.addButton("code",{icon:"sourcecode",tooltip:"Source code",onAction:o}),e.ui.registry.addMenuItem("code",{icon:"sourcecode",text:"Source code",onAction:o})})(e),{})))}();