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/favorite_app.spec.ts

@@ -0,0 +1,72 @@
+import { test } from "./helpers/test_helper";
+import { expect } from "@playwright/test";
+
+test.describe("Favorite App Tests", () => {
+  test("Add app to favorite", async ({ po }) => {
+    await po.setUp({ autoApprove: true });
+
+    // Create a test app
+    await po.sendPrompt("create a test app");
+    await po.goToAppsTab();
+
+    // Get the app name from the UI (randomly generated)
+    const appItems = await po.page.getByTestId(/^app-list-item-/).all();
+    expect(appItems.length).toBeGreaterThan(0);
+    const firstAppItem = appItems[0];
+    const testId = await firstAppItem.getAttribute("data-testid");
+    const appName = testId!.replace("app-list-item-", "");
+
+    // Get the app item (assuming it's not favorited initially)
+    const appItem = po.page.locator(`[data-testid="app-list-item-${appName}"]`);
+    await expect(appItem).toBeVisible();
+
+    // Click the favorite button
+    const favoriteButton = appItem
+      .locator("xpath=..")
+      .locator('[data-testid="favorite-button"]');
+    await expect(favoriteButton).toBeVisible();
+    await favoriteButton.click();
+
+    // Check that the star is filled (favorited)
+    const star = favoriteButton.locator("svg");
+    await expect(star).toHaveClass(/fill-\[#6c55dc\]/);
+  });
+
+  test("Remove app from favorite", async ({ po }) => {
+    await po.setUp({ autoApprove: true });
+
+    // Create a test app
+    await po.sendPrompt("create a test app");
+    await po.goToAppsTab();
+
+    // Get the app name from the UI
+    const appItems = await po.page.getByTestId(/^app-list-item-/).all();
+    expect(appItems.length).toBeGreaterThan(0);
+    const firstAppItem = appItems[0];
+    const testId = await firstAppItem.getAttribute("data-testid");
+    const appName = testId!.replace("app-list-item-", "");
+
+    // Get the app item
+    const appItem = po.page.locator(`[data-testid="app-list-item-${appName}"]`);
+
+    // First, add to favorite
+    const favoriteButton = appItem
+      .locator("xpath=..")
+      .locator('[data-testid="favorite-button"]');
+    await favoriteButton.click();
+
+    // Check that the star is filled (favorited)
+    const star = favoriteButton.locator("svg");
+    await expect(star).toHaveClass(/fill-\[#6c55dc\]/);
+
+    // Now, remove from favorite
+    const unfavoriteButton = appItem
+      .locator("xpath=..")
+      .locator('[data-testid="favorite-button"]');
+    await expect(unfavoriteButton).toBeVisible();
+    await unfavoriteButton.click();
+
+    // Check that the star is not filled (unfavorited)
+    await expect(star).not.toHaveClass(/fill-\[#6c55dc\]/);
+  });
+});