When lsp-ui-doc-show-with-mouse is nil or when lsp-ui-doc-mode is
  disabled, track-mouse was not being cleared. This caused mouse
  movements to generate command events that would:
  - Hide the lsp-ui-doc popup unexpectedly (even when shown via glance)
  - Interrupt isearch causing it to exit

  Fixes:
  1. Clear track-mouse in lsp-ui-doc--setup-mouse when disabled
  2. Remove redundant track-mouse management from lsp-ui-doc--make-request
  3. Clean up track-mouse when mode is disabled