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/delete_provider.spec.ts

@@ -3,10 +3,8 @@ import { test } from "./helpers/test_helper";
 test("delete custom provider should not freeze", async ({ po }) => {
   await po.setUp();
   await po.goToSettingsTab();
-  await po.page.getByTestId("custom-provider-more-options").click();
+  await po.page.getByTestId("delete-custom-provider").click();
   await po.page.getByRole("button", { name: "Delete Provider" }).click();
-  await po.page.getByRole("button", { name: "Delete Provider" }).click();
-
   // Make sure UI hasn't freezed
   await po.goToAppsTab();
 });