feat: improve Playwright configuration and enhance error handling in CreatePRDialog

- Updated Playwright configuration to always reuse existing servers, improving test efficiency.
- Enhanced CreatePRDialog to handle null browser URLs gracefully, ensuring better user experience during PR creation failures.
- Added new unit tests for app specification format and automaker paths, improving test coverage and reliability.
- Introduced tests for file system utilities and logger functionality, ensuring robust error handling and logging behavior.
- Implemented comprehensive tests for SDK options and dev server service, enhancing overall test stability and maintainability.

apps/server/tests/unit/lib/app-spec-format.test.ts

@@ -0,0 +1,57 @@
+import { describe, it, expect } from "vitest";
+import {
+  APP_SPEC_XML_FORMAT,
+  getAppSpecFormatInstruction,
+} from "@/lib/app-spec-format.js";
+
+describe("app-spec-format.ts", () => {
+  describe("APP_SPEC_XML_FORMAT", () => {
+    it("should export a non-empty string constant", () => {
+      expect(typeof APP_SPEC_XML_FORMAT).toBe("string");
+      expect(APP_SPEC_XML_FORMAT.length).toBeGreaterThan(0);
+    });
+
+    it("should contain XML format documentation", () => {
+      expect(APP_SPEC_XML_FORMAT).toContain("<project_specification>");
+      expect(APP_SPEC_XML_FORMAT).toContain("</project_specification>");
+      expect(APP_SPEC_XML_FORMAT).toContain("<project_name>");
+      expect(APP_SPEC_XML_FORMAT).toContain("<overview>");
+      expect(APP_SPEC_XML_FORMAT).toContain("<technology_stack>");
+      expect(APP_SPEC_XML_FORMAT).toContain("<core_capabilities>");
+    });
+
+    it("should contain XML escaping instructions", () => {
+      expect(APP_SPEC_XML_FORMAT).toContain("&lt;");
+      expect(APP_SPEC_XML_FORMAT).toContain("&gt;");
+      expect(APP_SPEC_XML_FORMAT).toContain("&amp;");
+    });
+  });
+
+  describe("getAppSpecFormatInstruction", () => {
+    it("should return a string containing the XML format", () => {
+      const instruction = getAppSpecFormatInstruction();
+      expect(typeof instruction).toBe("string");
+      expect(instruction).toContain(APP_SPEC_XML_FORMAT);
+    });
+
+    it("should contain critical formatting requirements", () => {
+      const instruction = getAppSpecFormatInstruction();
+      expect(instruction).toContain("CRITICAL FORMATTING REQUIREMENTS");
+      expect(instruction).toContain("<project_specification>");
+      expect(instruction).toContain("</project_specification>");
+    });
+
+    it("should contain verification instructions", () => {
+      const instruction = getAppSpecFormatInstruction();
+      expect(instruction).toContain("VERIFICATION");
+      expect(instruction).toContain("exactly one root XML element");
+    });
+
+    it("should instruct not to use markdown", () => {
+      const instruction = getAppSpecFormatInstruction();
+      expect(instruction).toContain("Do NOT use markdown");
+      expect(instruction).toContain("no # headers");
+      expect(instruction).toContain("no **bold**");
+    });
+  });
+});