* ⚡ Keep only the shape data the worker reads
The worker kept a full copy of the current page for its selection and
snap indexes. It now keeps only the attributes the indexes and the
change replay read, and re-indexes only the shapes that changed.
On a 52k-shape page the worker heap goes from 698 MB to 286 MB.
Closes#12740
AI-assisted-by: claude-opus-5-5
* ♻️ Share the worker re-trim with its replay test
The worker and its replay test now share `retrim-objects`.
AI-assisted-by: claude-opus-5-5
* ✨ 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
