feat: Switch ZettelEditor to use hierarchical tree processor

- Replace createPublicationTreeFromContent with parseAsciiDocWithTree
- Now generates proper 30040/30041 event hierarchy
- Basic functionality working - preview needs hierarchy updates

✅ Verified: Parser runs, events generated, no crashes
✅ Test: "= Test Article" → 1 index + 2 content events (3 total)
✅ UI: Content type shows "Article", Publish button enabled

Ready for: Parse level UI improvements

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/lib/components/ZettelEditor.svelte

@@ -60,8 +60,8 @@ import Asciidoctor from "asciidoctor";
       return;
     }
     
-    // Use tree factory with corrected AST parser
+    // Use new hierarchical tree processor for NKBIP-01 compliance  
-    createPublicationTreeFromContent(content, ndk, parseLevel)
+    parseAsciiDocWithTree(content, ndk, parseLevel)
       .then(result => {
         console.log("Tree factory result:", result);
         publicationResult = result;