Tag selector (`DynamicSelector.svelte`) gets stuck and unusable in Firefox

[Greenheart]

First of all, great work on the new site! 🎉

Bug

It took multiple page refreshes on /submit to be able to submit the post with the selected tags, because the tag selector (DynamicSelector.svelte) got stuck in weird states.

For example:

• Sometimes empty popup (small white popup with minimal size, stuck above other content as you scroll)
• Sometimes the popup closes and remains closed, even if you clear the tag text input and even as you type in a new tag (which should re-open the tags popup).
• Sometimes the popup remains closed if the input is empty, even as you click outside the form (to move away focus), and then focus the tag input again.

Reproduction

I haven't found a consistent reproduction, and these might be several separate issues, but here are the general steps which caused what seems like several distinct error states:

1. Open Firefox v146 and navigate to https://sveltesociety.dev/submit
2. Select any type
3. Click the "Select tags" field to open the DynamicSelector.
4. Type in "SvelteKit"
5. Select "SvelteKit" in the popup.
6. And then you end up in different error states.

It's also worth noting that the form seems to behave differently depending on which content type you select, and if you enter any main content before selecting the type.