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/stores/toast.ts

@@ -0,0 +1,24 @@
+import { ref } from "vue";
+import { defineStore } from "pinia";
+
+export interface Toast {
+  id: number;
+  message: string;
+  type: "success" | "error";
+}
+
+let nextId = 0;
+
+export const useToastStore = defineStore("toast", () => {
+  const toasts = ref<Toast[]>([]);
+
+  function show(message: string, type: "success" | "error" = "success") {
+    const id = nextId++;
+    toasts.value.push({ id, message, type });
+    setTimeout(() => {
+      toasts.value = toasts.value.filter((t) => t.id !== id);
+    }, 3000);
+  }
+
+  return { toasts, show };
+});