feat: implement fuzzy search and replace functionality with Levenshtein distance

- Added `applySearchReplace` function to handle search and replace operations with fuzzy matching capabilities.
- Introduced tests for various scenarios including fuzzy matching with typos, exact matches, and handling whitespace differences.
- Created a parser for search/replace blocks to facilitate the new functionality.
- Updated prompts for search-replace operations to clarify usage and examples.
- Added utility functions for text normalization and language detection based on file extensions.
- Implemented a minimal stdio MCP server for local testing with tools for adding numbers and printing environment variables.

e2e-tests/snapshots/select_component.spec.ts_select-component-1.aria.yml

@@ -5,5 +5,4 @@
 - paragraph: Start building your amazing project here!
 - link "Made with Dyad":
   - /url: https://www.dyad.sh/
-- img
-- text: Edit with AI h1 src/pages/Index.tsx
+- text: h1 src/pages/Index.tsx