[BYOM]: Allow users to set system prompt

[LorenzoMinto]

Platforms

Linux, macOS, Windows

Description

Add an extra field in the model setup where the user can enter their own system prompt.

[rajneesh-18]

Is there anyone working on this issue?

[VISHESH0932]

@LorenzoMinto hello sir, can i work on this issue?

[jonathansampson]

@LorenzoMinto hello sir, can i work on this issue?

Thank you for your offer to assist with this issue. There is currently an associated PR waiting to be merged. Please consider taking a look and sharing any feedback you may have! All the best!

[srirambv]

Verification passed on

Brave	1.74.18 Chromium: 131.0.6778.85 (Official Build) beta (64-bit)
Revision	9e238f4e6036c0b250ffefd506a55813f3aad501
OS	Windows 11 Version 23H2 (Build 22631.4460)

• Verified steps from brave/brave-core#25727
• Verified setting custom system prompt, Leo uses the prompt to generate responses

40690.mp4