Developer app fixes

[raymondjacobson]

• Creating dev app sends user-signed relay for CreateDeveloperApp so the indexer accepts the transaction, then uses POST /developer-apps/{address}/access-keys to create the first bearer token.
• useDeveloperApps image fix – Maps image_url (API) to imageUrl (client) correctly so app icons load.
• AppDetailsPage credential labels – Adds short descriptions for API Key, API Secret, and Bearer Token.
• EditAppPage token management – Adds per-token delete (trash) and a “Create New Bearer Token” button.
• Masked secret display – Introduces MaskedSecretDisplay for API Secret and Bearer Token: masked by default (•••• + last 4 chars) and an eye icon to toggle visibility; copy still uses the full value.

[changeset-bot]

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Latest commit: 9578ac2

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