Enable Japanese layout per file through undoable changes, or for all
files through a saved profile preference. Show the controls when the
WASM renderer and either setting are active.
Add writing mode, orientation, ruby, emphasis, warichu and line fitting
controls with icons and English and Japanese translations. Cover the
file change, profile preference and control behavior.
* ✨ Show color tokens toggle on canvas background picker
* 🐛 Apply token click on canvas background with no shape selected
* ✨ Apply and persist color tokens on canvas background
* 🌐 Translate canvas background section label
Repair text shapes with empty/broken content at all three levels
(root, paragraph-set, paragraph) in migration 0025 to prevent
workspace update failures. Handle all corner cases: nil/empty/non-
vector children, non-map items, wrong types. Remove geometry-only
validation skip in changes.cljc so all shapes are validated.
AI-assisted-by: qwen3.7-plus
