fix: toolbar overlap chat input

[urmauur]

Describe Your Changes

• Fix toolbar chat input overlap

Known Issue

We are using bg-textarea for our toolbar because the textarea is on the right panel and needs a blur effect.
That’s why we don’t set a background for the textarea, instead, the toolbar background should match the center panel.

The code changes only update the background class for the toolbar element and reposition the toolbar to fit with the chat input, as the toolbar is positioned absolutely

Fixes Issues

• Closes bug: Input text overlaps model settings #3647
• Closes #

Self Checklist

• Added relevant comments, esp in complex areas
• Updated docs (for bug fixes / features)
• Created issues for follow-up changes or refactoring needed

[louis-jan]

LGTM

[github-actions]

Barecheck - Code coverage report

Total: 60.07%

Your code coverage diff: 0.00% ▴

Uncovered files and lines

File	Lines
web/screens/Thread/ThreadCenterPanel/ChatInput/index.tsx	78, 82, 90-91, 109, 112-113, 119-123, 128, 141-143, 147-149, 154, 157, 190, 196, 198, 265, 268-269, 294, 298-299, 339, 362, 414-416, 418-420, 422-424, 426, 430-431, 467