Initial commit: Nextcloud Notes Tauri app with WYSIWYG editor

Features:
- WYSIWYG markdown editor with TipTap
- Manual save with unsaved changes indicator
- Auto-title derivation from first line (with manual override)
- Manual sync button with visual feedback
- Auto-sync every 5 minutes
- Full formatting toolbar (bold, italic, headings, lists, code)
- Note creation, editing, deletion
- Search and favorites filter
- Cross-platform desktop app built with Tauri + React + TypeScript

src/types.ts

@@ -0,0 +1,23 @@
+export interface Note {
+  id: number;
+  etag: string;
+  readonly: boolean;
+  content: string;
+  title: string;
+  category: string;
+  favorite: boolean;
+  modified: number;
+}
+
+export interface APIConfig {
+  serverURL: string;
+  username: string;
+  password: string;
+}
+
+export interface AppSettings {
+  serverURL: string;
+  username: string;
+  syncInterval: number;
+  fontSize: number;
+}