feat(renderer): StatusBar reads from editor store (word count, cursor pos)

src/renderer/components/layout/StatusBar.tsx

@@ -1,12 +1,23 @@
+import { useEditorStore } from '@/stores/editor-store';
+
+function countWords(text: string): number {
+  return text.trim().length === 0 ? 0 : text.trim().split(/\s+/).length;
+}
+
 export function StatusBar() {
+  const { buffers, activeId } = useEditorStore();
+  const buf = activeId ? buffers.get(activeId) : null;
+  const wordCount = buf ? countWords(buf.content) : 0;
+  const cursor = buf?.cursor ?? { line: 1, column: 1 };
+
   return (
     <footer className="flex h-7 items-center justify-between border-t border-border bg-card/20 px-3 text-xs text-muted-foreground">
       <div className="flex items-center gap-4">
-        <span>0 words</span>
+        <span>{wordCount} words</span>
         <span>UTF-8</span>
       </div>
       <div className="flex items-center gap-4">
-        <span>Ln 1, Col 1</span>
+        <span>Ln {cursor.line}, Col {cursor.column}</span>
         <span>Markdown</span>
       </div>
     </footer>