fix: skip playwright integration test on Docker network failures

When the Docker registry is unreachable (proxy timeout, connection
refused), the test should skip gracefully instead of fatally failing,
since the network issue is environmental rather than a code bug.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: lpcox

test/integration/playwright_test.go

@@ -388,7 +388,14 @@ CMD ["node", "mock-mcp-server.js"]
 	buildCmd := exec.Command("docker", "build", "-t", imageName, tmpDir)
 	buildOutput, err := buildCmd.CombinedOutput()
 	if err != nil {
-		t.Logf("Build output:\n%s", string(buildOutput))
+		outputStr := string(buildOutput)
+		t.Logf("Build output:\n%s", outputStr)
+		// Skip if the failure is due to network issues (can't pull base image)
+		if strings.Contains(outputStr, "failed to resolve source metadata") ||
+			strings.Contains(outputStr, "i/o timeout") ||
+			strings.Contains(outputStr, "connection refused") {
+			t.Skipf("Skipping test: Docker build failed due to network issues: %v", err)
+		}
 		t.Fatalf("Failed to build test image: %v", err)
 	}