refactor(wayland): complete runtime state decomposition

[devmobasa]

Summary

• Complete Phase 7 by integrating the four reviewed runtime-owner slices.
• Move focus, pointer, toolbar, acquisition, fallback-placement, and suppression state out of the former shared StateData bag.
• Extract RenderRuntime for canvas-layer caches, render baselines, and typed UI-damage history.
• Centralize pointer, touch, and stylus surface classification in SurfaceRouter and split the long input handlers into focused routes.
• Delete StateData and preserve callback ordering, toolbar drag handoff, capture correlation, focus suppression, modal ownership, cursor precedence, and damage behavior.