AI Chat history feature should be disabled by default on Android

[petemill]

Until these are all implemented:

• setting to clear history exists

  • Adds preferences and methods to delete Leo conversations on Android brave-core#27074

• user sees a disclaimer saying that history is now stored by default

  • Introduced with desktop feature in:
    • AI Chat notice for conversation storage #42360
    • AI Chat storage notice should dismiss only after the first prompt is sent #42853

• Regular browser history data deletion deletes any related web page visit from conversations

  • Introduced with desktop feature in:
    • AI Chat conversations should persist browser restart #42800
    • AIChat conversation data storage brave-core#25876

• A new "Leo AI" browser data deletion checkbox deletes all AI conversations

  • Adds preferences and methods to delete Leo conversations on Android brave-core#27074

Other Android-specific PRs:

• [AI Chat]: Make it possible to Open AI Chat on Android when history is disabled brave-core#27003
• [AI Chat]: Android history setting brave-core#26988
• [AI Chat]: Update Android UI to open AI Chat in a tab brave-core#26823

[diracdeltas]

@petemill for verifcation can you link to the PRs which implement the checked-off items?

user sees a disclaimer saying that history is now stored by default~

Regular browser history data deletion deletes any related web page visit from conversations

[petemill]

@diracdeltas I've updated the description above to include where each item is resolved and updated the test plans in those issues to make it a little clearer. Also this issue should actually have been closed by:

• [AI Chat] disable history feature enabled by default on Android brave-core#27038

And so we'll make a new issue to verify the two open issues.

[petemill]

Fixed by brave/brave-core#27038