Refactor SessionTracker and SessionManager into a single class

[bhouston]

Description

This PR addresses issue #372 by merging SessionTracker and SessionManager into a single class and converting BrowserDetector to a functional approach.

Changes

1. Merged SessionTracker and SessionManager into a single SessionTracker class

   • Moved appropriate functionality from SessionManager into SessionTracker
   • Maintained backward compatibility with existing code
   • Simplified the API and eliminated redundant abstractions

2. Converted BrowserDetector class to a functional approach

   • Replaced the static class with standalone functions
   • Inlined the browser detection functions into SessionTracker for simplicity

3. Updated all references and tests to use the new implementation

Testing

• All existing tests pass
• Browser functionality works as expected

Related Issues

Closes #372