Starting to modularize into separate cli / server packages. (#55)

* Starting to move a lot of code into packages/server

* More of the massive refactor, builds and runs, some issues though.

* Fixing outstanding issue with double messages.

* Fixing a minor UI issue.

* Fixing the build post-merge.

* Running formatting.

* Addressing comments.

packages/server/src/utils/errors.ts

@@ -0,0 +1,24 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+export function isNodeError(error: unknown): error is NodeJS.ErrnoException {
+  return error instanceof Error && 'code' in error;
+}
+
+export function getErrorMessage(error: unknown): string {
+  if (error instanceof Error) {
+    return error.message;
+  } else {
+    // Attempt to convert the non-Error value to a string for logging
+    try {
+      const errorMessage = String(error);
+      return errorMessage;
+    } catch {
+      // If String() itself fails (highly unlikely)
+      return 'Failed to get error details';
+    }
+  }
+}