Refactor WebR architecture with pure modules and clean separation of concerns

- Extract pure WebR modules without Vue dependencies to src/webr/
- Create layered architecture: Core → Runtime → Storage → Utils
- Replace complex composables with clean, testable modules
- Fix output processing to handle R condition objects properly
- Add proper TypeScript types throughout, eliminate 'any' usage
- Implement consistent error handling with cleanup
- Add comprehensive WebR API documentation references

Key improvements:
- WebRInstance: Clean lifecycle management
- Executor: Robust code execution with proper output capture
- OutputProcessor: Fixed INFO/WARNING message categorization
- Serializer: Handles complex R objects with fallback strategies
- PackageManager: Tracks installations with version info
- FileSystem: Virtual filesystem operations

Output now correctly shows:
- INFO: `geom_smooth()` using formula = 'y ~ x'
- WARNING: Clean warning messages without duplication

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: stared

package.json

@@ -1,7 +1,7 @@
 {
   "name": "webr-ggplot2-demo",
   "private": true,
-  "version": "0.1.12",
+  "version": "0.2.1",
   "type": "module",
   "scripts": {
     "dev": "vite",

src/App.vue

@@ -60,8 +60,6 @@ const handleFileUpload = async (csvData: CsvData): Promise<void> => {
 
 const handleFileRemoved = (): void => {
   currentCsvData.value = null
-  // Clear any data-related variables in R
-  void executeCode('if (exists("data")) rm(data)')
 }
 
 const handleExampleSelect = async (example: RExample): Promise<void> => {