fix: show full right side gradient border

[uinstinct]

Description

Prevent the right side input border from being trimmed during streaming.

closes #9549

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Checklist

• [] I've read the contributing guide
• [] The relevant docs, if any, have been updated or created
• [] The relevant tests, if any, have been updated or created

Screen recording or screenshot

before.mp4

after.mp4

Tests

[ What tests were added or updated to ensure the changes work as expected? ]

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Summary by cubic

Prevent the input’s right-side gradient border from being clipped during streaming by removing width: 100% from InputBoxDiv so the border renders fully.

^{Written for commit 7f46011. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 1 file