Migrate webviews from React 16 + react-bootstrap to React 19 + @vscode-elements/elements

- Upgrade React 16.14.0 to React 19.x with react-jsx transform
- Replace deprecated @vscode/webview-ui-toolkit with @vscode-elements/elements (Lit-based)
- Replace react-bootstrap components with native HTML + custom SCSS
- Add custom Bootstrap-equivalent utility classes in vscode.scss
- Add TypeScript declarations for vscode-elements web components
- Migrate all webview entry points to React 19 createRoot API
- Convert class components to functional components
- Update webpack config for React 19 compatibility
- Fix tas-client version compatibility (override to ~0.2.33)

Author: chagong

package-lock.json

@@ -347,9 +347,8 @@
     "@types/lodash": "^4.14.186",
     "@types/node": "20.x",
     "@types/path-exists": "^4.0.2",
-    "@types/react": "^17.0.50",
-    "@types/react-dom": "^16.9.16",
-    "@types/react-redux": "^7.1.24",
+    "@types/react": "^19.0.0",
+    "@types/react-dom": "^19.0.0",
     "@types/semver": "^7.7.1",
     "@types/vscode": "^1.74.0",
     "@types/winreg": "^1.2.31",
@@ -379,29 +378,29 @@
     "vscjava.vscode-java-dependency"
   ],
   "dependencies": {
-    "@iconify-icons/codicon": "1.2.8",
-    "@iconify/react": "^1.1.4",
-    "@reduxjs/toolkit": "^1.8.6",
+    "@reduxjs/toolkit": "^2.0.0",
+    "@vscode-elements/elements": "^2.5.0",
     "@vscode/codicons": "^0.0.44",
-    "@vscode/webview-ui-toolkit": "1.4.0",
     "@xmldom/xmldom": "^0.8.13",
     "axios": "^1.15.0",
-    "bootstrap": "^4.6.2",
+    "bootstrap": "^5.3.8",
     "compare-versions": "^6.1.1",
     "expand-home-dir": "0.0.3",
     "expand-tilde": "^2.0.2",
     "fs-extra": "^11.3.3",
     "hdr-histogram-js": "^3.0.1",
     "highlight.js": "11.11.1",
     "jdk-utils": "^0.4.4",
-    "jquery": "^3.6.1",
+    "jquery": "^4.0.0",
     "lodash": "^4.18.1",
-    "react": "^16.14.0",
-    "react-bootstrap": "^1.6.6",
-    "react-dom": "^16.14.0",
-    "react-redux": "^7.2.9",
+    "react": "^19.0.0",
+    "react-dom": "^19.0.0",
+    "react-redux": "^9.0.0",
     "semver": "^7.7.4",
     "vscode-extension-telemetry-wrapper": "^0.15.2",
     "vscode-tas-client": "^0.1.75"
+  },
+  "overrides": {
+    "tas-client": "~0.2.33"
   }
 }