[Leo] - Update to individual chat design

[aguscruiz]

Made an update to each conversation item with the following:

Figma:
https://www.figma.com/file/m0Gdbf0wtqyfEFGm32VLLc/Leo?type=design&node-id=1492%3A64269&mode=design&t=STQ64VGMlUZx8NCH-1

General (both user input and response):

• Changed vertical padding from 32px to 16px

User input

• Removed the background color for the whole input (instead of gray it's now transparent)
• The avatar circle is now gray

[stephendonner]

Verification PASSED using

Brave | 1.64.41 Chromium: 121.0.6167.139 (Official Build) nightly (x86_64)
-- | --
Revision | 1c56846eb16cec835298c09cd75ec45fc425507b
OS | macOS Version 14.4 (Build 23E5180j)

Confirmed the following:

• Vertical padding
• Background color changed to transparent
• Avatar circle is now gray

beta (1.63.141)	nightly (1.64.41)

[kjozwiak]

Removing QA Pass the above will need to be re-checked via 1.63.x as we uplifted as per brave/brave-core#21944 (review). Used #35177 (comment) as the needed verification to uplift into 1.63.x.

The above requires 1.63.149 or higher for 1.63.x verification 👍

[MadhaviSeelam]

Verified PASSED using

Brave | 1.63.149 Chromium: 121.0.6167.164 (Official Build) beta (64-bit)
-- | --
Revision | 16509c04a66afcc00d180c0b62a887b9fc4776a2
OS | Windows 11 Version 23H2 (Build 22631.3085)

Confirmed following as per Figma designs:

• Vertical padding
• Background color changed to transparent
• Avatar circle is now gray

1.62.x	1.63.x

[hffvld]

Verified on Galaxy Tab S8 and Pixel 7 using version(s):

Device/OS: 
- Galaxy Tab S8 / gts8wifixx-user 13 TP1A.220624.014 release-keys
- Pixel 7 / panther_beta-user 14 AP21.240119.009 release-keys
Brave build: 1.63.153
Chromium: 121.0.6167.164 (Official Build) beta (64-bit) 

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STEPS:

1. Followed the steps from [Leo] - Update to individual chat design #35177 (comment)

ACTUAL RESULTS:

• Verified that vertical padding is 16px for both user input and response
• Verified that the background color for the whole input is now transparent
• Verified that the avatar circle is now gray

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