Initial commit: note-taking/task-tracking app with LLM integration scaffold

Vue 3 + TypeScript frontend with Pinia stores, markdown rendering (marked + DOMPurify),
wikilink/tag linkification, and autocomplete. Quart async backend with SQLAlchemy 2.0,
PostgreSQL ARRAY columns, task-note companion linking, backlinks, and note-to-task
conversion. Docker Compose setup with PostgreSQL 16 and Ollama.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/utils/markdown.ts

@@ -0,0 +1,21 @@
+import { marked } from "marked";
+import DOMPurify from "dompurify";
+import { linkifyTags, linkifyWikilinks } from "@/utils/tags";
+
+export function renderMarkdown(text: string): string {
+  const html = marked(text) as string;
+  const withTags = linkifyTags(html);
+  const withLinks = linkifyWikilinks(withTags);
+  return DOMPurify.sanitize(withLinks, {
+    ADD_ATTR: ["data-tag", "data-title"],
+  });
+}
+
+export function renderPreview(text: string): string {
+  const html = marked(text) as string;
+  const withTags = linkifyTags(html);
+  const withLinks = linkifyWikilinks(withTags);
+  return DOMPurify.sanitize(withLinks, {
+    FORBID_TAGS: ["a", "img"],
+  });
+}