Display Default App URL on Get

[justinmcbride]

closes https://github.com/github/spark/issues/235

[Copilot]

Pull Request Overview

This PR modifies how the CLI displays the default app URL by refactoring the command execution to use explicit exit codes and by returning errors from command functions.

• Refactors main.go to capture and use the exit code returned by cmd.Execute.
• Updates cmd/root.go to return a custom exitCode instead of calling os.Exit directly.
• Changes cmd/get.go to return errors from its command function and prints the app URL from a structured response.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
main.go	Updates main to capture exit codes from cmd.Execute.
cmd/root.go	Refactors Execute() to return a custom exit code.
cmd/get.go	Modifies the get command to return errors and display the default app URL.

Comments suppressed due to low confidence (1)

main.go:10

• [nitpick] Consider renaming the variable 'code' to 'exitCode' to more clearly indicate that it represents the process exit code.

code := cmd.Execute()

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