[Bug]: Edit clip's Apply is out of view in a non-maximized editor, and a click there closes the dialog without saving #1005

What happens

In the Edit clip dialog, the footer (Reset / Cancel / Apply) sits inside the scrolling body instead of being pinned. In an editor window 794 css px tall (1240×1000 physical at 125 %), the card is clipped at y = 747 while Apply is at 740–774, so Apply is not visible.

A click where Apply should be lands on _modalBackdrop. That closes the dialog and discards the edit (new trim range and crop) with no warning.

You can only reach Apply by wheel-scrolling inside the dialog first. In a maximized window (826 css px) it fits: Apply 742–776, card bottom 777.

Expected

Apply is always visible (pinned footer, or the body scrolls and the footer does not), and a backdrop click does not drop unsaved crop or trim edits silently.

Steps

1. Size the editor window to about 1240×1000 at 125 % (not maximized).
2. Double-click a clip → Edit clip, move a grip or pick 1:1.
3. Look for Apply at the bottom of the card, then click where it is.

Environment

v2.0.0-rc.15 (same code as v2.0.0), Windows 11, 1920×1080 @ 125 %. Found in the rc.15 computer-use pass (#1003).