Spellcheck option C: the build flags misspellings, the editor underlines them on every slide in every browser

[grunion-ai]

What changed

Spellcheck option C: the build checks every word once, the deck carries the refused list, the editor underlines those words on every slide in every browser.

• lib/spell.mjs: textsOf (slide rows, html runs, master rows), checkable (skips tokens a dictionary cannot judge: under three letters, all caps, inner capitals, digits), flags(deck, correct) (sorted, lowercase, unique; honours spell.ignore), loadChecker(lang) (nspell + dictionary-en, en only, null when not installed).
• create takes {spell} and writes /*SPELL*/[…]/*/SPELL*/ into the file next to the log and the versions. The CLI loads the checker, prints the flagged words, and says plainly when the dictionary is not installed. --from re-checks after the human's edits land.
• Template: ::highlight(spell) red wavy underline through the CSS Highlight API, painted after every live canvas draw and on input in the row being edited; none while presenting, on paper, or in the ⤓ PDF. The ✓ toggle clears and repaints. The browser's own spellcheck attribute stays as the second layer.
• Model: a deck may say spell: {ignore: ["decklet"]}. Documented in SKILL.md next to lang.
• Dependencies: nspell and dictionary-en as optional devDependencies (peerDependenciesMeta optional), the same shape as Playwright. The deck itself still ships nothing but the words.

Why

Kyle never saw the spellcheck button do anything: option A hands the work to the browser, and Chrome marks only the focused row after a keystroke, Safari marks only typed words, and the Claude desktop pane has spellcheck off. A word list in the file paints the same everywhere.

Verification

• New gate test/spell.test.mjs: tokeniser rules, create writes the block (and [] without a checker), the real dictionary agrees on the seeded typos and rejects de, and a live Chromium proof: three flagged words on slide 1 (master row, text row, html run), one on slide 2, the toggle clears and repaints, typing a flagged word underlines it live, presenting paints none.
• deck.html and library.html rebuilt through the CLI with the dictionary; their gates load the same checker.
• Eyeballed in the desktop pane on the spellcheck test deck: renewls, reveiw, colour, decklet underlined on an unfocused slide, which option A never managed there.
• Full suite on the branch: node --test test/**/*.test.mjs → 170 pass, 0 fail, 0 skipped (Playwright live tests included).

Follow-up owned by Kyle: adriany task 1943 covers the versions button; the same deck is the place to try this.

🤖 Generated with Claude Code