Select text inside a selected Heading or Text block and a floating
toolbar offers B / I / U / Link / Unlink (execCommand; mousedown is
prevented so the selection survives; mod+b/i/u handled on the editable).
Storage: new `html` prop holding sanitised inline HTML, with `text` kept
as the plain mirror for AI summaries, search and legacy content.
Unmarked edits store html '' so legacy nodes keep their shape. The
allowlist (b strong i em u a br span; style=color only, hex/rgb/
var(--wsb-*); href via DOMPurify URI check AND safeUrl, unsafe links
unwrapped; target only _blank with forced rel=noopener) runs on commit,
on canvas render and again at export. If `text` was changed without
`html` (Sitesmith update_props), the stale html is ignored.
Each edit commits once (blur, or deselect if no blur came first) as one
setProp = one undo step; the old blur+deselect double commit is gone.
Heading colour default now tokenRef('text'). Sitesmith canvas summary
skips `html`.
Refs #46
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
