Server: - New POST /api/lint/check proxies to LanguageTool API (public free endpoint by default; override with LANGUAGETOOL_URL env var for self-hosted instance) - Returns trimmed match list: message, offset, length, replacements, kind (spelling|grammar), ruleId - Disables cosmetic rules that don't suit creative writing - 20-second timeout; falls back with 502 on error Frontend: - LintMark: transient TipTap Mark extension (never saved to DB — stripLintMarks() removes them from getJSON() before onChange fires) - buildTextMap(): walks ProseMirror doc tree, builds parallel plain- text string + position array so LanguageTool char offsets map back to exact PM positions even across paragraphs / headings - clearLintMarks() + runLint(): check → clear old marks → apply new marks in one transaction, no flicker - Click on underlined text → fixed-position popover showing the error message + up to 6 one-click replacement buttons + Ignore / ✕ - Applying a replacement triggers an automatic re-check after 600 ms - lintStatus: idle → checking → done → stale (when user edits) - ABC toolbar button shows count badge when errors found, ✓ when clean - Wavy red underline = spelling, wavy blue = grammar Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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