Context Transition Windows: auto-detect temporal dim by scanning
x_in's axes for a size that's > overlap and <= 4096. Search order:
dim 2 (standard [B,C,T,H,W]), dim 1, dim 0 (LTXAV packs frames at 0),
then remaining dims. Skip windowing entirely when no suitable dim is
found (packed formats where no axis maps to frame count).
Studio JS: fix 'Split by transitions' toggle showing 'undefined' -
was appending splitToggle.container which doesn't exist; corrected
to splitToggle.wrap (the actual property returned by toggleEl).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
