fix: heading line space

src/lib/editor/ToolbarExpanded.svelte

@@ -158,7 +158,7 @@
   });
 
   // Must match line-height in editor.css (.paper .tiptap)
-  const DEFAULT_LINE_HEIGHT = '1.5';
+  const DEFAULT_LINE_HEIGHT = '1';
   const LINE_HEIGHTS = [
     { value: '1',    label: 'Single'      },
     { value: '1.15', label: '1.15'        },

src/lib/editor/lineHeight.ts

@@ -39,14 +39,14 @@ export const LineHeight = Extension.create({
   addCommands() {
     return {
       setLineHeight: (lineHeight: string) => ({ commands }) => {
-        return this.options.types.every((type) =>
-          commands.updateAttributes(type, { lineHeight })
-        );
+        return this.options.types
+          .map((type) => commands.updateAttributes(type, { lineHeight }))
+          .some((r) => r);
       },
       unsetLineHeight: () => ({ commands }) => {
-        return this.options.types.every((type) =>
-          commands.resetAttributes(type, 'lineHeight')
-        );
+        return this.options.types
+          .map((type) => commands.resetAttributes(type, 'lineHeight'))
+          .some((r) => r);
       },
     };
   },

src/lib/export/odt.ts

@@ -12,6 +12,7 @@ const CUST_P = '__cust_p__';
 const CUST_H = '__cust_h__';
 
 const DEFAULT_FONT = 'Georgia'; // must match DEFAULT_EDITOR_FONT in ToolbarExpanded.svelte
+const DEFAULT_LINE_HEIGHT = 1;  // must match line-height in editor.css (.paper .tiptap)
 
 function hasCustomAttrs(attrs: TiptapNode['attrs']): boolean {
   if (!attrs) return false;
@@ -177,6 +178,8 @@ export async function exportToOdt(editor: Editor): Promise<void> {
         const lhRaw = String(node.attrs.lineHeight);
         const lhNum = parseFloat(lhRaw);
         opts.lineHeight = isNaN(lhNum) ? lhRaw : lhNum;
+      } else {
+        opts.lineHeight = DEFAULT_LINE_HEIGHT;
       }
       const ta = node.attrs?.textAlign;
       if (ta === 'left' || ta === 'center' || ta === 'right' || ta === 'justify') {

src/styles/editor.css

@@ -24,7 +24,7 @@
   outline: none;
   font-family: var(--font-serif);
   font-size: 1.05rem;
-  line-height: 1.5;
+  line-height: 1;
   color: var(--color-page-text);
 
   /* Multi-page background: page surfaces separated by editor background */
@@ -109,7 +109,7 @@
 .paper .tiptap h2,
 .paper .tiptap h3 {
   font-weight: 700;
-  line-height: 1.3;
+  line-height: 1;
   margin-top: 1.5em;
   margin-bottom: 0.5em;
 }