Wrap handleInspectorResize in useCallback so rrp v4's panel registration
useLayoutEffect (which includes onResize in its dep array) does not
de-register/re-register the inspector panel on every render.
Without this, any re-render of SessionView (workspace data arriving,
daemon status change, etc.) created a new handleInspectorResize reference,
triggering rrp's cleanup → re-registration cycle. With React 19's automatic
batching, this window reliably overlapped with the expand()/collapse()
useEffect on initial sidebar click, causing the "Panel constraints not found
for Panel inspector" throw that tore down the session view.
Closes#185.
dac53d8295