Component that allows a predefined list with the ability to add a new entry if it does not exist

### Describe the bug I am experimenting with your components but cannot find one that hat allows a predefined list with the ability to add a new entry if it does not exist. Also I would like the list to have separations with a heading for each new group of items. Per chance, can any of your components accomplish the above tasks? ### Reproduction Please see above ### Version and System Info ```shell System: OS: Linux 6.1 LMDE 6 (faye) 6 (faye) CPU: (24) x64 13th Gen Intel(R) Core(TM) i7-13700KF Memory: 34.90 GB / 62.63 GB Container: Yes Shell: 5.2.15 - /bin/bash Binaries: Node: 22.1.0 - ~/.volta/tools/image/node/22.1.0/bin/node npm: 10.7.0 - ~/.volta/tools/image/node/22.1.0/bin/npm pnpm: 9.12.3 - ~/.volta/bin/pnpm bun: 1.1.34 - ~/.volta/bin/bun Browsers: Chrome: 131.0.6778.85 Chromium: 130.0.6723.116 npmPackages: @sveltejs/adapter-auto: ^3.3.1 => 3.3.1 @sveltejs/kit: ^2.8.1 => 2.8.1 @sveltejs/vite-plugin-svelte: ^4.0.1 => 4.0.1 svelte: ^5.2.5 => 5.2.5 vite: ^5.4.11 => 5.4.11 ```