fix(ui): smooth opacity transition on SendButton visibility toggle

[Iqrima]

What changed

Updated SendButton.tsx transition CSS properties to include opacity alongside transform (transition-[transform,opacity]).

Why

SendButton toggles opacity-0! via local.hidden when the input state changes, but line 35 previously only transitioned scale transforms, causing the button to snap abruptly when hidden/shown.

How it was tested

Verified that the send button fades smoothly over 150ms when toggled in ChatInput.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 937ca42f-e327-452d-a70e-d8b64eca7bd0

📥 Commits

Reviewing files that changed from the base of the PR and between dd314b2 and 538662a.

📒 Files selected for processing (1)

• apps/web/src/components/ui/components/SendButton.tsx

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📝 Walkthrough

Summary by CodeRabbit

• Style
  • Improved the send button’s animation with smoother transform and fade effects.
  • Added a brief ease-out transition for a more responsive interface.

Walkthrough

Updated the SendButton transition classes to animate both transform and opacity. The transition now uses ease-out timing with a 150-millisecond duration.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title uses conventional commit format, describes the SendButton opacity transition, and is 66 characters long.
Description check	✅ Passed	The description clearly explains the SendButton change, its purpose, and how it was tested.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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