[AI Chat]: URLs for all conversations

[fallaciousreasoning]

Url variations

a. Opening FullPage Leo should be at path / and have a blank conversation.
b. Sending a message should change the url to /[conversation-uuid]
c. Refreshing should load the same conversation
d. Choosing another conversation from the navigation bar should change url to /conversation-uuid] (and refresh should load that same conversation)
e. Clicking the "expand" icon from SidePanel Leo should show the same conversation

Header variations

• On FullPage Leo, the header should always be the conversation title and never show the "back" button
• On SidePanel Leo:

1. Showing a default conversation should show the regular Leo header with no "back" button
2. Starting a new conversation via the side panel toolbar button should show the regular Leo header with no "back" button
3. Opening a non-default conversation from the "Conversation history" menu item should show the conversation title with the "back" button.
4. Clicking the "back" button from that should go to the most recent default conversation for the associated tab, and should show the regular Leo header with no "back" button

[diracdeltas]

can you confirm that these URLs only work within brave:// or brave-untrusted://? it would be a potential security problem if an http(s) page could link to a page within leo.

[petemill]

It's WebUI so has the same protections as any other WebUI - an http(s) page cannot link to or fetch from chrome:// or chrome-untrusted://

[srirambv]

Verification passed on

Brave	1.75.166 Chromium: 132.0.6834.111 (Official Build) beta (64-bit)
Revision	0c5da0a4df158be9400ac84df9312b627cc4dec0
OS	Windows 11 Version 24H2 (Build 26100.2894)

• Verified steps from issue description
• Verified opening Leo with blank conversation just shows brave://leo-ai in the URL path
• Ve4rified sending a message or starting a conversation appends /[conversation-uuid] to the URL path
• Verified switching between conversations updates the [conversation-uuid] and reloading page updates the conversation
• Verified expanding the same conversation from side panel loads the same conversation in full screen with correct [conversation-uuid]
• Verified there is no back button shown on conversation header when opening Leo in full page view
• Verified opening conversation history from side panel and selecting a conversation shows the back button
• Verified navigating back from Leo conversation header loads the conversation associated with the tab and removes the back button

42055.mp4