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/azure_provider_settings.spec.ts

@@ -0,0 +1,61 @@
+import { expect } from "@playwright/test";
+import { test as testWithPo } from "./helpers/test_helper";
+
+testWithPo("Azure provider settings UI", async ({ po }) => {
+  await po.setUp();
+  await po.goToSettingsTab();
+
+  // Look for Azure OpenAI in the provider list
+  await expect(po.page.getByText("Azure OpenAI")).toBeVisible();
+
+  // Navigate to Azure provider settings
+  await po.page.getByText("Azure OpenAI").click();
+
+  // Wait for Azure settings page to load
+  await po.page.waitForSelector('h1:has-text("Configure Azure OpenAI")', {
+    state: "visible",
+    timeout: 5000,
+  });
+
+  // Confirm the new configuration form is rendered
+  await expect(
+    po.page.getByText("Azure OpenAI Configuration Required"),
+  ).toBeVisible();
+  await expect(po.page.getByLabel("Resource Name")).toBeVisible();
+  await expect(po.page.getByLabel("API Key")).toBeVisible();
+  await expect(
+    po.page.getByRole("button", { name: "Save Settings" }),
+  ).toBeVisible();
+
+  // Environment variable helper section should still be available
+  await expect(
+    po.page.getByText("Environment Variables (optional)"),
+  ).toBeVisible();
+
+  // FIX: disambiguate text matches to avoid strict mode violation
+  await expect(
+    po.page.getByText("AZURE_API_KEY", { exact: true }),
+  ).toBeVisible();
+  await expect(
+    po.page.getByText("AZURE_RESOURCE_NAME", { exact: true }),
+  ).toBeVisible();
+
+  // Since no env vars are configured in the test run, both should read "Not Set"
+  await expect(
+    po.page
+      .getByTestId("azure-api-key-status")
+      .getByText("Not Set", { exact: true }),
+  ).toBeVisible();
+  await expect(
+    po.page
+      .getByTestId("azure-resource-name-status")
+      .getByText("Not Set", { exact: true }),
+  ).toBeVisible();
+
+  // The guidance text should explain precedence between saved settings and environment variables
+  await expect(
+    po.page.getByText(
+      "Values saved in Settings take precedence over environment variables.",
+    ),
+  ).toBeVisible();
+});