Description editor: preserve newlines on export, toggle Quote, highlight active toolbar buttons

- Enter now starts a new <p> (defaultParagraphSeparator) so line breaks
  in the description box show up as line breaks in HTML/Markdown/Confluence
  exports; htmlToMarkdown also handles <div>-separated paragraphs.
- Clicking Quote while already in a blockquote toggles back to a paragraph.
- Toolbar buttons (Bold, Italic, Bullet, Number, Quote) turn blue to
  reflect the formatting state at the current cursor/selection.

app/renderer/editor.js

@@ -329,10 +329,32 @@ class GuideEditor {
   }
 
   toolbarBtn(action, label, block = null) {
-    return el('button', {
+    const btn = el('button', {
       type: 'button',
       onClick: () => this.formatDescription(action, block),
     }, label);
+    btn.dataset.action = action;
+    if (block) btn.dataset.block = block;
+    return btn;
+  }
+
+  /** Reflect the current selection's formatting state on the toolbar buttons. */
+  updateToolbarState() {
+    if (!this.dom.richToolbar) return;
+    for (const btn of this.dom.richToolbar.children) {
+      const { action, block } = btn.dataset;
+      let active = false;
+      try {
+        if (action === 'formatBlock') {
+          active = document.queryCommandValue('formatBlock').toLowerCase() === (block || 'blockquote');
+        } else if (action === 'bold' || action === 'italic' || action === 'insertUnorderedList' || action === 'insertOrderedList') {
+          active = document.queryCommandState(action);
+        }
+      } catch {
+        active = false;
+      }
+      btn.classList.toggle('active', active);
+    }
   }
 
   bindShellEvents() {
@@ -422,7 +444,14 @@ class GuideEditor {
     this.dom.addTableBlockBtn.addEventListener('click', () => this.addBlock('table'));
 
     this.dom.descEditor.addEventListener('focus', () => {
+      // Make Enter start a new paragraph (<p>) rather than a plain <div>,
+      // so line breaks survive sanitization and show up in exports.
+      document.execCommand('defaultParagraphSeparator', false, 'p');
       if (this.currentStep) this.pushCanvasHistory('description');
+      this.updateToolbarState();
+    });
+    this.dom.descEditor.addEventListener('blur', () => {
+      for (const btn of this.dom.richToolbar.children) btn.classList.remove('active');
     });
     this.dom.descEditor.addEventListener('input', () => {
       if (!this.currentStep) return;
@@ -430,6 +459,12 @@ class GuideEditor {
       this.pendingSave = true;
       this.saveStepDebounced();
       this.emitMeta();
+      this.updateToolbarState();
+    });
+    this.dom.descEditor.addEventListener('keyup', () => this.updateToolbarState());
+    this.dom.descEditor.addEventListener('mouseup', () => this.updateToolbarState());
+    document.addEventListener('selectionchange', () => {
+      if (document.activeElement === this.dom.descEditor) this.updateToolbarState();
     });
 
     this.dom.descEditor.addEventListener('paste', (e) => {
@@ -1821,9 +1856,12 @@ class GuideEditor {
       case 'insertOrderedList':
         document.execCommand('insertOrderedList');
         break;
-      case 'formatBlock':
-        document.execCommand('formatBlock', false, block || 'blockquote');
+      case 'formatBlock': {
+        const want = block || 'blockquote';
+        const current = document.queryCommandValue('formatBlock').toLowerCase();
+        document.execCommand('formatBlock', false, current === want ? 'p' : want);
         break;
+      }
       case 'createLink': {
         const selectedText = window.getSelection().toString();
         const text = selectedText || window.prompt('Link text');
@@ -1844,6 +1882,7 @@ class GuideEditor {
       this.pendingSave = true;
       this.saveStepDebounced();
     }
+    this.updateToolbarState();
   }
 
   onDocumentKeyDown(e) {

app/renderer/style.css

@@ -487,6 +487,11 @@ kbd {
   margin-bottom: 8px;
 }
 .rich-toolbar button { padding: 4px 8px; font-size: 12px; }
+.rich-toolbar button.active {
+  background: var(--accent);
+  border-color: var(--accent);
+  color: var(--accent-fg);
+}
 .rich-editor {
   min-height: 110px;
   max-height: 220px;

exporters/htmlmd.js

@@ -42,6 +42,8 @@ function htmlToMarkdown(html) {
     .replace(/<hr\s*\/?>/gi, '\n---\n')
     .replace(/<p>/gi, '\n')
     .replace(/<\/p>/gi, '\n')
+    .replace(/<div>/gi, '\n')
+    .replace(/<\/div>/gi, '\n')
     .replace(/<[^>]+>/g, '');
 
   return decodeEntities(out).replace(/[ \t]+\n/g, '\n').replace(/\n{3,}/g, '\n\n').trim();