When Chrome's debugger detaches during page navigation (common in SPAs
like Gmail, Google Calendar), the extension now automatically re-attaches
instead of permanently losing the connection.
Changes:
- onDebuggerDetach: detect navigation vs tab close, attempt re-attach
with 3 retries and exponential backoff (300ms, 700ms, 1500ms)
- Add reattachPending guard to prevent concurrent re-attach races
- connectOrToggleForActiveTab: handle pending re-attach state
- onRelayClosed: clear reattachPending on relay disconnect
- Add chrome.tabs.onRemoved listener for proper cleanup
Fixes#19744
67bac62c2c
