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/index.css

@@ -0,0 +1,121 @@
+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+
+body {
+  margin: 0;
+  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
+    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
+    sans-serif;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+}
+
+code {
+  font-family: source-code-pro, Menlo, Monaco, Consolas, 'Courier New',
+    monospace;
+}
+
+/* TipTap Editor Styles */
+.ProseMirror {
+  min-height: 100%;
+}
+
+.ProseMirror:focus {
+  outline: none;
+}
+
+.ProseMirror h1 {
+  font-size: 2em;
+  font-weight: bold;
+  margin-top: 0.5em;
+  margin-bottom: 0.5em;
+}
+
+.ProseMirror h2 {
+  font-size: 1.5em;
+  font-weight: bold;
+  margin-top: 0.5em;
+  margin-bottom: 0.5em;
+}
+
+.ProseMirror h3 {
+  font-size: 1.25em;
+  font-weight: bold;
+  margin-top: 0.5em;
+  margin-bottom: 0.5em;
+}
+
+.ProseMirror p {
+  margin-bottom: 0.5em;
+}
+
+.ProseMirror strong {
+  font-weight: bold;
+}
+
+.ProseMirror em {
+  font-style: italic;
+}
+
+.ProseMirror s {
+  text-decoration: line-through;
+}
+
+.ProseMirror u {
+  text-decoration: underline;
+}
+
+.ProseMirror code {
+  background-color: #f3f4f6;
+  padding: 0.125rem 0.25rem;
+  border-radius: 0.25rem;
+  font-family: 'Courier New', monospace;
+  font-size: 0.9em;
+}
+
+.ProseMirror pre {
+  background-color: #1f2937;
+  color: #f3f4f6;
+  padding: 1rem;
+  border-radius: 0.5rem;
+  overflow-x: auto;
+  margin: 1em 0;
+}
+
+.ProseMirror pre code {
+  background-color: transparent;
+  padding: 0;
+  color: inherit;
+}
+
+.ProseMirror ul,
+.ProseMirror ol {
+  padding-left: 1.5rem;
+  margin: 0.5em 0;
+}
+
+.ProseMirror ul {
+  list-style-type: disc;
+}
+
+.ProseMirror ol {
+  list-style-type: decimal;
+}
+
+.ProseMirror li {
+  margin: 0.25em 0;
+}
+
+.ProseMirror blockquote {
+  border-left: 3px solid #d1d5db;
+  padding-left: 1rem;
+  margin: 1em 0;
+  color: #6b7280;
+}
+
+.ProseMirror hr {
+  border: none;
+  border-top: 2px solid #e5e7eb;
+  margin: 2em 0;
+}