Reenable inline comment webview split diff view, fix styling

Summary:
The inline comment webview's diff view was previous disabled due to build issues it caused. This stack has fixed all those issues, so we can reenable this now.

While at it, let's fix up a few things:
- simplify files
- add root css file, import correct css file in htmlForWebview
- use stylex declaration in css for production builds to work
- fix build issue not adding the inline webview as an input

Differential Revision: D64488795

fbshipit-source-id: b7748b9a3dbdf000504aa58f0939ad948f80c8b2

addons/vscode/inlineCommentWebview.html

@@ -9,6 +9,6 @@
     <div id="root"></div>
     <script
       type="module"
-      src="/extension/facebook/comments/webview/InlineCommentEntrypoint.tsx"></script>
+      src="/extension/facebook/comments/webview/inlineCommentWebview.tsx"></script>
   </body>
 </html>

addons/vscode/vite.config.mts

@@ -29,9 +29,11 @@ const isInternal = existsSync(path.resolve(__dirname, 'facebook/README.facebook.
 const input = [normalizeInputPath('webview.html')];
 if (isInternal) {
   // Currently, the inline comment webview is not used in OSS
-  normalizeInputPath('inlineCommentWebview.html');
+  input.push(normalizeInputPath('inlineCommentWebview.html'));
 }
 
+console.log(isInternal ? 'Building internal version' : 'Building OSS version');
+
 // vite-plugin-stylex doesn't support renaming the output CSS file, so we have to do that ourselves.
 function moveStylexFilenamePlugin(): Plugin {
   return {