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Spelling is now checked live as you type, fully offline, using the pure-Rust `spellbook` crate to read Hunspell .aff/.dic dictionaries (no C libhunspell — the binary stays self-contained; ldd unchanged). - Canadian (en-CA, default) and British (en-GB) English dictionaries are compiled in; more languages are auto-discovered from system Hunspell folders and ~/.config/md-manuscript/dictionaries/. A "Spelling" row in the top bar toggles live checking and picks the dictionary. - Misspellings are underlined in red; right-clicking a word opens a menu of suggested corrections. A results-panel and one-click fixes work too. - Checks run on a background thread, debounced ~400ms after the last edit. Prose is extracted with pulldown-cmark so code spans, code blocks and link targets are skipped; ALL-CAPS initialisms are ignored. - LanguageTool still layers on top: when its results are fresh they own the underlines (spelling + grammar); once you edit, the offline checker resumes. The editor underlines, issues panel and fix-apply logic are now shared between the two sources. Bundled dictionaries are SCOWL-derived under a permissive license (kept in dictionaries/<lang>/license). Adds spell-check unit tests (tokenizer, code-block skipping, offset mapping, en-CA/en-GB spelling); 40 tests pass. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01N9kRuP7JvXoUGdNNeg5ZSs