Command palette (Ctrl/Cmd-K), quick add with natural dates, links in search; links.js split out of app.js

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

public/index.html

@@ -53,6 +53,8 @@
 </div>
 <div id="toast" role="status"></div>
 <script src="/webauthn.js"></script>
+<script src="/links.js"></script>
+<script src="/palette.js"></script>
 <script src="/app.js"></script>
 </body>
 </html>