This pull request involves multiple changes to the browser_use module, focusing on code cleanup, error handling improvements, and enhancements to the DOM interaction logic. Below are the most important changes grouped by theme:

Code Cleanup:

• Removed unused imports from browser_use/agent/message_manager/service.py, including datetime and ChatAnthropic. [1] [2]

Error Handling:

• Changed error handling logic to use the last line of the error message instead of truncating it to a fixed length in browser_use/agent/message_manager/service.py and browser_use/agent/prompts.py. [1] [2]
• Removed max_error_length parameter and related logic from several methods and constructors in browser_use/agent/message_manager/service.py, browser_use/agent/prompts.py, and browser_use/agent/service.py. [1] [2] [3]

DOM Interaction:

• Updated the DOM tree building logic in browser_use/dom/buildDomTree.js to use fixed positioning for overlays and labels, and added dynamic position updates on scroll events. [1] [2] [3]

Security Settings:

• Changed the default value of disable_security to True in browser_use/browser/browser.py and browser_use/browser/context.py. [1] [2] [3]

Miscellaneous:

• Improved the send_keys method in browser_use/controller/service.py to handle unknown keys by attempting to send each key individually.