Allow manual browsing by entering a URL in the browser

[Cheggin]

Problem

Users need to be able to browse manually inside the desktop browser, including typing or pasting a URL themselves and navigating to it. Today the browser experience is too agent-driven if users cannot directly enter a destination.

Scope

• Add a user-facing URL/address entry point for the browser.
• Support typed URLs, pasted URLs, and likely search-query fallback behavior if the input is not a URL.
• Wire manual navigation into the existing browser/session state so back/forward/reload and visible page state stay consistent.
• Preserve agent-driven browsing while allowing the user to take manual control when needed.
• Handle invalid URLs and navigation failures with clear UI feedback.

Acceptance criteria

• A user can type or paste a URL and navigate to it manually.
• Manual navigation updates browser state, history, page title, and any existing address display consistently.
• Back, forward, and reload continue to work after manual navigation.
• Agent sessions do not lose track of the active browser state after a manual navigation.
• Tests cover URL normalization, navigation dispatch, and UI behavior for valid and invalid inputs.

[dot-Justin]

Working on this 👀