feat(initial): add comprehensive PDF to JPEG preview library with dual-environment support

- Add Node.js implementation using @push.rocks/smartpdf
- Add browser implementation with PDF.js and Web Workers
- Support configurable quality, dimensions, and page selection
- Include comprehensive TypeScript definitions and error handling
- Provide extensive test coverage for both environments
- Add download functionality and browser compatibility checking

.vscode/extensions.json

@@ -0,0 +1,10 @@
+{
+  "recommendations": [
+    "ms-vscode.vscode-typescript-next",
+    "esbenp.prettier-vscode",
+    "ms-vscode.vscode-json",
+    "ms-vscode.test-adapter-converter",
+    "hbenl.vscode-test-explorer",
+    "GitMoji.gitmoji-vscode"
+  ]
+}