opencode: add OAC

opencode/context/development/ui-navigation.md

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+<!-- Context: development/navigation | Priority: low | Version: 1.0 | Updated: 2026-02-15 -->
+
+# UI Development Navigation
+
+**Scope**: Frontend code + visual design
+
+---
+
+## Structure
+
+```
+Frontend Code (development/frontend/):
+└── react/
+    ├── navigation.md
+    └── react-patterns.md
+
+Visual Design (ui/web/):
+├── animation-patterns.md
+├── ui-styling-standards.md
+├── design-systems.md
+└── design/
+    ├── concepts/
+    └── examples/
+```
+
+---
+
+## Quick Routes
+
+| Task | Path |
+|------|------|
+| **React patterns** | `frontend/react/react-patterns.md` |
+| **Animations** | `../../ui/web/animation-patterns.md` |
+| **Styling** | `../../ui/web/ui-styling-standards.md` |
+| **Design systems** | `../../ui/web/design-systems.md` |
+
+---
+
+## By Framework
+
+**React** → `frontend/react/`
+
+## By Concern
+
+**Code patterns** → `development/frontend/`
+**Visual design** → `ui/web/`
+
+---
+
+## Related Context
+
+- **Core Standards** → `../core/standards/code-quality.md`
+- **UI Category** → `../ui/navigation.md`