feat(cli): add custom dashboard port option

[srpvpn]

Closes #356

Changes

1. Added a .changeset file documenting the change
2. Modified cli.ts to add the -p, --port <number> option to the dashboard command
3. Refactored commands.ts to:
   • Extract spawn configuration logic into getDashboardSpawnOptions()
   • Add validateDashboardPort() for port validation
   • Update dashboard() to use the new functions and accept DashboardOptions
4. Added comprehensive tests for both new functions
5. Updated documentation in cli.mdx and dashboard.mdx

[srpvpn]

I see that the checks have fallen, Im going to fix them within a day

[jamescmartinez]

thanks for the PR! I added two suggestions. Once CI passes I'll do another review and merge it.

[jamescmartinez]

Suggested change

	Use `--port` to run the dashboard on a custom port:
	The dashboard starts on `http://localhost:3000` by default.
	To use a custom port:

[jamescmartinez]

Suggested change

	Without `--port`, this launches the OpenWorkflow dashboard on
	`http://localhost:3000`. See
	[Dashboard](/docs/dashboard) for details.
	See [Dashboard](/docs/dashboard) for details.

[srpvpn]

@jamescmartinez Everything should be OK now

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commit: 84be94f

[jamescmartinez]

thanks, merged!

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✅ All modified and coverable lines are covered by tests.

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