Fixes #4822: Fix browser cleanup when remote browser connection enabled but no remote browser available

[roomote]

Summary

This PR fixes issue #4822 where Chrome helper processes were not being properly cleaned up when remote browser connection was enabled but no remote browser was available.

Problem

When remote browser connection is enabled in settings but no remote browser is actually available, the code would:

1. Try to connect to a remote browser
2. Fail and fall back to launching a local browser
3. But during cleanup, still try to disconnect() instead of close() the browser
4. This left Chrome helper processes running

Solution

• Added isUsingRemoteBrowser flag to track the actual connection type (not just the setting)
• Modified closeBrowser() to use the actual connection type instead of just checking the setting
• Ensure resetBrowserState() is always called to properly clean up all state
• Added comprehensive tests covering all browser connection scenarios

Testing

Added unit tests that verify:

• Local browser is properly closed when remote connection is enabled but falls back to local
• Remote browser is properly disconnected when actually connected to remote
• Local browser is properly closed when remote connection is disabled

All tests pass and demonstrate the fix working correctly.

Changes

• src/services/browser/BrowserSession.ts: Added connection tracking and fixed cleanup logic
• src/services/browser/__tests__/BrowserSession.test.ts: Added comprehensive test coverage

Fixes #4822

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Important

Fixes browser cleanup logic in BrowserSession by tracking actual connection type and updating tests.

• Behavior:
  • Adds isUsingRemoteBrowser flag in BrowserSession to track actual connection type.
  • Modifies closeBrowser() in BrowserSession to use isUsingRemoteBrowser for cleanup logic.
  • Ensures resetBrowserState() is always called for proper cleanup.
• Testing:
  • Adds tests in BrowserSession.test.ts to verify local browser closes when remote fallback is used.
  • Tests remote browser disconnects when connected, and local closes when remote is disabled.
• Files:
  • BrowserSession.ts: Connection tracking and cleanup logic.
  • BrowserSession.test.ts: Comprehensive test coverage for connection scenarios.

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[daniel-lxs]

Closing in favor of #4823, while this PR has some good ideas the issue author wants to fix this issue.