Feature request: in-editor spelling suggestions + synonyms popover (left-click on flagged words)

[juliatetrud]

Browsers flag misspellings in contenteditable/textarea fields but expose no suggestion API to JS, so any friendlier UX (click a flagged word → popover with corrections and synonyms) requires the editor to ship its own dictionary pass (e.g. hunspell/nspell + ProseMirror decorations) — too invasive to patch from outside. Requesting first-class editor support: spellcheck decorations with a suggestions/synonyms popover across PT editors and plain text fields. We'd use it on day one.

[MA2153]

Converted this to a discussion as it is a feature request.