Remove instances of "bubble"

[eyeseast]

In some components, we pass through native events to parent components. In Svelte 4, this looked like this:

<button on:click>...</button>

However, the on: directive is deprecated and events handlers are now props, which we can check for and require. Svelte's automatic migration sometimes runs into cases where it can't tell if a handler prop is required, and so it adds a bubbler for backwards compatibility. These don't break anything, but we should get rid of them.

These will show up as we migrate components, so this should happen as part of the migration, or after.

Components:

• src/lib/components/forms/Search.svelte
• src/lib/components/inputs/KeyValue.svelte