* fix(app): clamp split pane resize Prevent right-edge drags from overflowing the Electron viewport. * fix(app): isolate resize pointer state Keep concurrent resize drags from clobbering each other.
* fix(app): clamp split pane resize Prevent right-edge drags from overflowing the Electron viewport. * fix(app): isolate resize pointer state Keep concurrent resize drags from clobbering each other.