Fix brave notification description and textual button color in dark mode

[Pavneet-Sing]

Description

Notification dialog description color is hard to read in dark mode.

• For description in dark mode: can use #84889C color like wallet
• For textual button, can use #A0A5EB for dark and #4C54D2 for light like wallet

Note: Make sure to confirm the exact colors with figma if specs are available for dark mode/feature.

Actual result

Expected result

Update colors as per theme/figma.

cc: @sujitacharya2005 @deeppandya

[deeppandya]

Thank you @Pavneet-Sing. it seems we are missing dark mode spec here : https://www.figma.com/file/sdVBBufbl2A11hAgPNfyqG/Android-13-Notifications?node-id=366%3A30681&t=kj66ZSk8TrqEpCmt-0
@sujitacharya2005 can you update the issue based on the suggestions ?

[anatolydsgn]

@deeppandya @timchilds I've just updated the design for this notification screen.

https://www.figma.com/file/sdVBBufbl2A11hAgPNfyqG/Android-13-Notifications?node-id=1243%3A31639&t=7Pd5NQyY0I0HjTn0-1

[deeppandya]

we will be updating night mode colors for this issue.

[anatolydsgn]

@deeppandya just in case, here's a quick fix without changing the layout. you could just use updated colors and illustration. https://www.figma.com/file/sdVBBufbl2A11hAgPNfyqG/Android-13-Notifications?node-id=363%3A30672&t=JBalKKlQzJNGa6zV-1

[kjozwiak]

The above requires 1.47.168 or higher for 1.47.x verification. @Uni-verse leave this one for me 👍 I think we'll need a follow up as it still looks like it's not using the correct colours. Looks the same as before. I wouldn't consider this a blocker but we'll need a follow up which I'll create tomorrow AM. Example:

CCing @deeppandya @sujitacharya2005 @timchilds

[kjozwiak]

Labelling this as QA/No and release-notes/exclude as this actually never made it into 1.47.x or Brave in general. Looks like the fix was never merged as per https://github.com/brave/brave-core/pull/16128/files (don't see any colour/theme fixes). Created #27767 as a follow up.