fix(frontend): Attempt to resolve TypeError in RichTextInput.svelte

Fixes an issue where `ue.getWordAtDocPos is not a function` would be thrown in `MessageInput.svelte`.

The error was caused by a timing issue where the `getWordAtDocPos` method on the `RichTextInput` component was not available when called from an event handler within the same component.

This change refactors the code to pass the `getWordAtDocPos` function as a callback prop from `RichTextInput` to `MessageInput`, ensuring it's available when needed.

src/lib/apis/users/index.ts

@@ -126,7 +126,7 @@ export const getUsers = async (
 	let error = null;
 	let res = null;
 
-	let searchParams = new URLSearchParams();
+	const searchParams = new URLSearchParams();
 
 	searchParams.set('page', `${page}`);