🤖 fix: remove extra bottom gap on mobile

[ibetitsmike]

Summary:

• Remove the global bottom safe-area padding that created a visible blank band under the chat composer in mobile layout.
• Apply the safe-area inset as internal padding on the workspace chat input instead, so the composer background sits flush to the bottom while keeping controls above the home indicator.

Validation:

• make static-check

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[chatgpt-codex-connector]

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Reviewed commit: 028c833ff9

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[ibetitsmike]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Bravo.

ℹ️ About Codex in GitHub

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• Mark a draft as ready
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