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/supabase_branch.spec.ts

@@ -0,0 +1,25 @@
+import { testSkipIfWindows } from "./helpers/test_helper";
+import { expect } from "@playwright/test";
+
+testSkipIfWindows("supabase branch selection works", async ({ po }) => {
+  await po.setUp({ autoApprove: true });
+  await po.importApp("minimal");
+  await po.sendPrompt("tc=add-supabase");
+
+  // Connect to Supabase
+  await po.page.getByText("Set up supabase").click();
+  await po.clickConnectSupabaseButton();
+  await po.clickBackButton();
+  await po.page.getByTestId("token-bar-toggle").click();
+  // The default branch has a small context.
+  await expect(po.page.getByTestId("token-bar")).toContainText("6% of 128K");
+
+  await po.getTitleBarAppNameButton().click();
+  await po.page.getByTestId("supabase-branch-select").click();
+  await po.page.getByRole("option", { name: "Test Branch" }).click();
+
+  await po.clickBackButton();
+  // The test branch has a large context (200k tokens) so it'll hit the 100% limit.
+  // This is to make sure we're connecting to the right supabase project for the branch.
+  await expect(po.page.getByTestId("token-bar")).toContainText("100% of 128K");
+});