posthog feat(ph-ai): browser use mode

Problem

Adding browser automation capabilities to the AI assistant, allowing it to interact with websites through a headless browser to help users test user flows, reproduce bugs, and provide UX feedback.

Changes

Added a new browser_use agent mode that enables browser automation capabilities
Implemented BrowserNavigateTool for navigating to websites
Added support for Anthropic's native computer tool for browser interactions (clicking, typing, scrolling, etc.)
Created BrowserSessionManager to manage browser sessions using Hyperbrowser
Added automatic cleanup of browser sessions when conversations end
Added feature flag phai-browser-use to control access to the new functionality
Updated UI to support displaying screenshots and browser interactions

How did you test this code?

Local + tests TBD

Dec 09 '25 21:12 kappa90

[!WARNING] This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite. Learn more

#43070 👈 (View in Graphite)
#42909 : 1 other dependent PR (#43062 )
#42697
#42696
#42060
#42052 : 1 other dependent PR (#42704 )
#42888
master

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Dec 09 '25 21:12 kappa90

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