Focused narrow-layout hotfix for Slay the Spire 2 v0.108.0 beta.
- Fix group assignment and reorder controls remaining off-screen when a mod row is wider than its visible clipped lane.
- Reposition controls when the clipping viewport resizes, even if the row keeps its wide minimum size.
- Add regression coverage for aligned, inset, zero-width, and nested clipping spans.
Verified with 127 automated tests and a Steam-launched v0.108.0 startup smoke test.