Rendering

Rendering is handled in render.lua.

Key design

Widgets mutate registry state.

The renderer builds tree output from registry state.

Steps

1. build nested tree
2. attach popup nodes
3. compute interactions
4. flatten tree
5. emit JSON

Deduplication

• last output is cached by root id
• identical trees are skipped

Swift tree application

Swift-side application is handled in:

• WidgetEngine
• WidgetStore

Update logic:

1. remove old nodes for root
2. insert new nodes
3. rebuild index

No diffing is needed.