book(I1): CodeMirror markdown editor in chapter pane

Replaces the plain textarea with a CodeMirror 5 instance configured
for markdown — syntax highlighting, line wrapping, smart Enter for
list continuation.

Library:
- Vendored CodeMirror 5.65.16 as three files in src/vendor (core,
  markdown mode, CSS). ~188 KB total. Lazy-loaded through
  loadCodeMirrorOnce() so the cost is only paid when a chapter
  opens.

Wiring:
- openBookChapter kicks off _upgradeChapterEditorToCodeMirror after
  the existing sync runs. The upgrade swaps the textarea for a
  CodeMirror instance bound to its DOM node and stores the editor
  handle on ta._cmEditor.
- syncBookChapterEditor pushes value changes through the CM editor
  when present (only if value differs AND the editor doesn't have
  focus — preserves the user's caret + IME composition).
- Editor change → updateBookChapterMarkdown, which already debounces
  history + repaints the markdown preview + page-count readout.
- Enter on a list line auto-continues the bullet (- / * / +) or
  numbered marker (1. → 2.); pressing Enter on an empty list item
  breaks out of the list.
- Falls back gracefully to the plain textarea if the CodeMirror
  download fails (offline / blocked CDN re-host).

CSS:
- Forces .bookChapterEditorBody .CodeMirror to fill its grid cell
  (CodeMirror's default is 300 px); matches the surrounding
  monospace font + line-height so the pre/post-upgrade UX is
  visually consistent.

Co-Authored-By: Claude Opus 4.7 <[email protected]>

src/index.html

@@ -1574,6 +1574,17 @@
       border: 1px solid var(--line); background: #fff;
       resize: none;
     }
+    /* Force the CodeMirror instance to fill the editor pane so it
+       doesn't render at its 300 px default. .CodeMirror is the
+       library's outer element, .CodeMirror-scroll the scrollable
+       inner; both need an explicit height of 100% to match the
+       grid cell. */
+    .bookChapterEditorBody .CodeMirror {
+      width: 100%; height: 100%;
+      font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
+      font-size: 13px; line-height: 1.55;
+    }
+    .bookChapterEditorBody .CodeMirror-scroll { padding: 8px 4px; }
     .bookChapterEditorPreviewWrap {
       border: 1px solid var(--line); background: #fff;
       overflow: auto;
@@ -10243,6 +10254,88 @@
       });
     }
 
+    // Lazy-load CodeMirror 5 + markdown mode (Phase I1). ~188 KB
+    // total; we only pay the download when the chapter editor opens.
+    let _codeMirrorPromise = null;
+    function loadCodeMirrorOnce() {
+      if (window.CodeMirror) return Promise.resolve(window.CodeMirror);
+      if (_codeMirrorPromise) return _codeMirrorPromise;
+      _codeMirrorPromise = (async () => {
+        if (!document.querySelector('link[data-cm-css]')) {
+          const link = document.createElement('link');
+          link.rel = 'stylesheet';
+          link.href = 'vendor/codemirror.min.css';
+          link.dataset.cmCss = '1';
+          document.head.appendChild(link);
+        }
+        await loadScriptOnce('vendor/codemirror.min.js');
+        await loadScriptOnce('vendor/codemirror-markdown.min.js');
+        if (!window.CodeMirror) throw new Error('CodeMirror failed to expose globally');
+        return window.CodeMirror;
+      })().catch(err => { _codeMirrorPromise = null; throw err; });
+      return _codeMirrorPromise;
+    }
+    async function _upgradeChapterEditorToCodeMirror() {
+      const ta = document.getElementById('bookChapterEditorTextarea');
+      if (!ta || ta.dataset.cmInited === '1') return;
+      let CM;
+      try { CM = await loadCodeMirrorOnce(); }
+      catch (err) {
+        console.warn('CodeMirror unavailable — falling back to plain textarea', err);
+        return;
+      }
+      const editor = CM.fromTextArea(ta, {
+        mode: 'markdown',
+        lineNumbers: false,
+        lineWrapping: true,
+        indentUnit: 2,
+        tabSize: 2,
+        smartIndent: false,
+        viewportMargin: Infinity,
+        extraKeys: {
+          // List-continuation: pressing Enter on a list line auto-
+          // continues the bullet / number marker. Strips the marker
+          // on an empty list item to break out of the list.
+          Enter: (cmInst) => {
+            const cursor = cmInst.getCursor();
+            const line = cmInst.getLine(cursor.line);
+            const ul = /^(\s*)([-*+])\s+(.*)$/.exec(line);
+            const ol = /^(\s*)(\d+)\.\s+(.*)$/.exec(line);
+            if (ul) {
+              const [, indent, marker, rest] = ul;
+              if (!rest) {
+                cmInst.replaceRange('', { line: cursor.line, ch: 0 }, { line: cursor.line, ch: line.length });
+                cmInst.replaceSelection('\n');
+                return;
+              }
+              cmInst.replaceSelection(`\n${indent}${marker} `);
+              return;
+            }
+            if (ol) {
+              const [, indent, num, rest] = ol;
+              if (!rest) {
+                cmInst.replaceRange('', { line: cursor.line, ch: 0 }, { line: cursor.line, ch: line.length });
+                cmInst.replaceSelection('\n');
+                return;
+              }
+              cmInst.replaceSelection(`\n${indent}${Number(num) + 1}. `);
+              return;
+            }
+            cmInst.replaceSelection('\n');
+          },
+        },
+      });
+      // Match the editor's visual style with the surrounding pane.
+      editor.getWrapperElement().style.cssText = 'width:100%;height:100%;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:13px;border:1px solid var(--line);background:#fff';
+      editor.on('change', () => {
+        // Debounce-pushed through updateBookChapterMarkdown which
+        // re-renders the preview + page-count readout.
+        updateBookChapterMarkdown(editor.getValue());
+      });
+      ta.dataset.cmInited = '1';
+      ta._cmEditor = editor;
+    }
+
     // Chapter editor (Phase C.5). Reflow entries open a two-pane
     // textarea + live preview instead of the canvas. The book stays
     // in 'book' template mode; an `editingChapterId` field tracks
@@ -10258,6 +10351,15 @@
       syncBookChapterEditor();
       syncInputs();
       render();
+      // Upgrade the textarea to CodeMirror on first open. After the
+      // upgrade, syncBookChapterEditor handles the editor's content
+      // via the _cmEditor handle on the textarea node.
+      _upgradeChapterEditorToCodeMirror().then(() => {
+        const ta = document.getElementById('bookChapterEditorTextarea');
+        if (ta?._cmEditor && ta._cmEditor.getValue() !== (entry.chapterMarkdown || '')) {
+          ta._cmEditor.setValue(entry.chapterMarkdown || '');
+        }
+      });
     }
     function closeBookChapter() {
       const book = state.book;
@@ -10280,7 +10382,18 @@
       const preview = document.getElementById('bookChapterEditorPreview');
       const pagesEl = document.getElementById('bookChapterEditorPages');
       if (titleEl && titleEl !== document.activeElement) titleEl.value = entry.chapterTitle || '';
-      if (ta && ta !== document.activeElement) ta.value = entry.chapterMarkdown || '';
+      if (ta) {
+        if (ta._cmEditor) {
+          // CodeMirror instance: only push when value differs AND the
+          // editor doesn't currently have focus, so live typing isn't
+          // clobbered by a re-sync.
+          const live = ta._cmEditor.getValue();
+          const next = entry.chapterMarkdown || '';
+          if (live !== next && !ta._cmEditor.hasFocus()) ta._cmEditor.setValue(next);
+        } else if (ta !== document.activeElement) {
+          ta.value = entry.chapterMarkdown || '';
+        }
+      }
       if (preview) preview.innerHTML = markdownToSafeHtml(entry.chapterMarkdown || '');
       if (pagesEl) {
         const pag = paginateChapter(entry, book);

src/vendor/codemirror-markdown.min.js

@@ -0,0 +1 @@
+!function(t){"object"==typeof exports&&"object"==typeof module?t(require("../../lib/codemirror"),require("../xml/xml"),require("../meta")):"function"==typeof define&&define.amd?define(["../../lib/codemirror","../xml/xml","../meta"],t):t(CodeMirror)}(function(w){"use strict";w.defineMode("markdown",function(m,d){var g=w.getMode(m,"text/html"),u="null"==g.name;void 0===d.highlightFormatting&&(d.highlightFormatting=!1),void 0===d.maxBlockquoteDepth&&(d.maxBlockquoteDepth=0),void 0===d.taskLists&&(d.taskLists=!1),void 0===d.strikethrough&&(d.strikethrough=!1),void 0===d.emoji&&(d.emoji=!1),void 0===d.fencedCodeBlockHighlighting&&(d.fencedCodeBlockHighlighting=!0),void 0===d.fencedCodeBlockDefaultMode&&(d.fencedCodeBlockDefaultMode="text/plain"),void 0===d.xml&&(d.xml=!0),void 0===d.tokenTypeOverrides&&(d.tokenTypeOverrides={});var 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src/vendor/codemirror.min.css

@@ -0,0 +1 @@
+.CodeMirror{font-family:monospace;height:300px;color:#000;direction:ltr}.CodeMirror-lines{padding:4px 0}.CodeMirror pre.CodeMirror-line,.CodeMirror pre.CodeMirror-line-like{padding:0 4px}.CodeMirror-gutter-filler,.CodeMirror-scrollbar-filler{background-color:#fff}.CodeMirror-gutters{border-right:1px solid #ddd;background-color:#f7f7f7;white-space:nowrap}.CodeMirror-linenumber{padding:0 3px 0 5px;min-width:20px;text-align:right;color:#999;white-space:nowrap}.CodeMirror-guttermarker{color:#000}.CodeMirror-guttermarker-subtle{color:#999}.CodeMirror-cursor{border-left:1px solid #000;border-right:none;width:0}.CodeMirror div.CodeMirror-secondarycursor{border-left:1px solid silver}.cm-fat-cursor .CodeMirror-cursor{width:auto;border:0!important;background:#7e7}.cm-fat-cursor div.CodeMirror-cursors{z-index:1}.cm-fat-cursor .CodeMirror-line::selection,.cm-fat-cursor .CodeMirror-line>span::selection,.cm-fat-cursor .CodeMirror-line>span>span::selection{background:0 0}.cm-fat-cursor 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src/vendor/codemirror.min.js

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