fix(status): show 'No target configured' instead of empty target label (#985)

[lvthillo]

Description

agentcore status printed an empty target label: AgentCore Status (target: ) on projects with no deployment target configured (any fresh agentcore create project, since it writes an empty aws-targets.json).

Root cause: the status action always returned a targetName string, substituting an empty string when no target was configured. The render layer only shows its "No target configured" fallback when targetName is missing entirely: an empty string counts as present, so the header printed a blank label. The fix is to leave targetName unset when there is no target, letting the existing fallback take over.

Verified with the built CLI: header now renders AgentCore Status (target: No target configured).
Note: status --json now omits targetName instead of emitting "targetName": "".

Related Issue

#985

Closes #

#985

Documentation PR

N/A

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update
• Other (please describe):

Testing

How have you tested the change?

• I ran npm run test:unit and npm run test:integ
• I ran npm run typecheck
• I ran npm run lint
• If I modified src/assets/, I ran npm run test:update-snapshots and committed the updated snapshots

Checklist

• I have read the CONTRIBUTING document
• I have added any necessary tests that prove my fix is effective or my feature works
• I have updated the documentation accordingly
• I have added an appropriate example to the documentation to outline the feature, or no new docs are needed
• My changes generate no new warnings
• Any dependent changes have been merged and published

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