Outline what items draw, and hold back editing instead of dropping it

From the second review:
- Cones, custom circles and resizable abilities lay out in a box sized
  for their largest version. They now also mark what they draw (the
  cone's icon, the circle, the range at its length), and the innermost
  mark is the one outlined.
- Edit placement draws its own lineup ends outside the canvas item
  layers; they now take a teammate's outline too.
- The room no longer drops an editing message that comes within 100 ms
  of the last. It holds the latest and sends it when the interval is
  up, so the last word always lands and a client still cannot send more
  than one per interval. This replaces letting removals through, which
  let a client flood the room.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
54575824f5Dara Adedeji committed on 10/13/2026, 2:46:59 AMparent9c6f205
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