SQLBI Whiteboard 1.1.2

Draw the pen's wet stroke over containers, not under them (#74)

Fixes a regression from #73.

Pen ink moved out of the `InkCanvas` and into `BoardSurface.OnRender`,
where draw
order matters — and the pending stroke was drawn *before* the loop over
document
objects. Images, text and LiveViews therefore painted straight over the
wet ink,
so a stroke crossing a container was invisible exactly where it
overlapped and
appeared all at once on lift, when it commits with the topmost z-index.

It is now drawn after the objects and before the hover and selection
chrome,
which is where it will sit once committed.

Version 1.1.2. Release build clean with `TreatWarningsAsErrors`, smoke
tests pass.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>