[BUG]: UI and Alignment Issues in Video Recorder Modal

[Spiral-Memory]

Description:

There are small but multiple issues with the video recorder UI:

Steps to reproduce:

1. Set up the Embedded chat and log in.
2. Click on the video recorder icon from the toolbar.
3. Observe the UI issues.

Expected behavior:

The UI should look clean and uniform.

Actual behavior:

1. The stacking context is not correct. Since it is a modal and is passed as a child to InputFormattingToolbar, which has a lower z-index than the header, the header appears to pop out, which is not appropriate.

2. Additionally, the alignment of the action button box is incorrect.

3. There are some unused styling and syntax issues that need attention.

4. Need some changes in design for clean UI

[Spiral-Memory]

@abhinavkrin , there were some UI issues in the video recorder modal. I have fixed them, the issue was mainly with stacking order which took time to understand and fix this. Additionally made the UI clean and fixed alignment issues. Kindly review the PR to see if everything looks fine or if any necessary changes are required.