feat(ui): port favorite spell bar overflow

Import the retail arrow-only spell bar scrollbar from LayoutDesc, preserve authored end-button extents and HideDisabled behavior in the shared retained widget, and bind each favorite list to its sole horizontal pixel-scroll model. Match retail selection exposure for off-screen spells and pin the behavior with real-fixture conformance tests.

Document the six-slice world-interaction completion program as the active pre-M4 work order.

Co-authored-by: Codex <codex@openai.com>
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Erik 2026-07-23 06:35:53 +02:00
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## Current program: `GameWindow` structural stabilization (M4 prerequisite)
## Current program: world interaction completion (M4 prelude)
The active work order is
[`2026-07-23-world-interaction-completion.md`](2026-07-23-world-interaction-completion.md).
It closes six remaining retail interaction surfaces before larger M4 subsystem
bodies begin: spell-bar overflow controls, status-bar Use/Assess commands,
assessment information, equipped-child picking, vendor browsing, and
server-authoritative vendor transactions. Slice 1 is active and ports the
DAT-authored arrow-only favorite-spell scrollbar through the shared retained
scrollbar/list model. Its implementation and complete Release suite pass;
connected overflow-arrow visual acceptance is pending.
---
## Completed program: `GameWindow` structural stabilization (M4 prerequisite)
**Outcome:** `GameWindow` becomes a thin Silk.NET composition/lifecycle shell
without changing accepted gameplay or rendering behavior. Focused App owners