The PTY may deliver a long URL across multiple chunks with enough delay
that the debounce fires between them, emitting a truncated URL. Fixed by:
1. Stripping trailing empty strings from split (artifact of trailing \n)
2. Deferring emission when the URL reaches the end of the buffer — a
confirmation timer (500ms) waits for more data before emitting
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>