Adjust cast modal borders for background blending

[willyogo]

Summary

• update cast modal input area border to a semi-transparent gray for better background blending
• align channel picker and Add image button borders with the same semi-transparent gray styling

Testing

• npm run lint (fails: next command not found in environment)

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Codex Task

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Project	Deployment	Review	Updated (UTC)
space-system	Ready	Preview, Comment	Dec 31, 2025 10:00pm
space-system (blankspace-testing)	Ready	Preview, Comment	Dec 31, 2025 10:00pm

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