feat: possibility to put carriage return at prompt with Enter key

[jpfox]

Thanks for this Web UI ! I like it.

When I press [Enter] key at prompt, it is directly sent to Ollama. I see that it is possible to insert a carriage return by [Shift]+[Enter] but it is not natural to press this combination when composing the prompt. I often send it before I've written all my text.

If [Enter] could add a carriage return and [Ctrl]+[Enter] send the prompt, it would be great. A checkbox to choose the behaviour of [Enter] key would be magic ^^

Thanks a lot

[jakobhoeg]

Thanks for the suggestion, @jpfox!

I haven't yet decided if this is something I'll implement as I believe the behaviour as it is right now is probably what most users are used to. However, I will keep it in mind.