Leo - Add "You / Leo" name indicator besides avatar and most popular actions on the top header of every prompt/answer

[aguscruiz]

Description

• Addding the name of the sender at the right side of the avatar.

Also adding quick access to most common tools on each one:

• For user: Copy / Edit / More (Shows rest of the contextual menu as it is now)
• For Leo: Copy / Regenerate / More (Shows rest of the contextual menu as it is now)

Design example
https://www.figma.com/file/m0Gdbf0wtqyfEFGm32VLLc/Leo?type=design&node-id=3125%3A39912&mode=design&t=Xj5LubWJF0IwyjvH-1

Design system for button states:
https://www.figma.com/file/MNwi0uwXNhkAbPiJ86G4vm/%E2%9C%A8-Leo?type=design&node-id=1506%3A8040&mode=design&t=MzAuxvpPR619wmZL-1

Expected result:

[LaurenWags]

@nullhook @rebron can one of you add the following labels as necessary:

• release-notes/exclude or release-notes/include

[MadhaviSeelam]

Verification PASSED using

Brave | 1.68.84 Chromium: 126.0.6478.40 (Official Build) beta (64-bit)
-- | --
Revision | c5a3b2ff9dcc938c32b2c1b3a66847661db5d005
OS | Windows 11 Version 23H2 (Build 22631.3672)

1. Installed 1.68.84
2. launched Brave
3. opened account.bravesoftware.com
4. logged in as a Leo premium user
5. clicked Leo icon on the sidebar to open Leo side panel
6. opened bbc.com in a new tab
7. accepted agreement and summarized the page

• Confirmed You is shown next the avatar in the side panel
• Confirmed Leo next to Leo icon in the side panel
• Confirmed Copy icon is shown for Leo
• Confirmed vertical 3 dot menu shown for Leo icon with Like answer and Dislike answer

example	example

[GeetaSarvadnya]

Verification PASSED on Vivo X70 Pro version 12 running Bravemonoarm64.apk_1.68.115

• Confirmed You is shown next the avatar in the side panel
• Confirmed Leo next to Leo icon in the side panel
• Confirmed Copy icon is shown for Leo
• Confirmed vertical 3 dot menu shown for Leo icon with Like answer and Dislike answer

Non premium user:

Example	Example

Premium user:

Example	Example