fix: dashboard names should be required to have minimum 1 character

[mGolestan98]

closes #890

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Name	Status	Preview	Comments	Updated (UTC)
hyperdx-v2-oss-app	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 5, 2025 4:59pm

[dhable]

Tested locally and returns an error when chart name is empty.
Thanks for the contribution!