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/i18n/index.ts

@@ -38,10 +38,10 @@ const createIsLoadingStore = (i18n: i18nType) => {
 };
 
 export const initI18n = (defaultLocale?: string | undefined) => {
-	let detectionOrder = defaultLocale
+	const detectionOrder = defaultLocale
 		? ['querystring', 'localStorage']
 		: ['querystring', 'localStorage', 'navigator'];
-	let fallbackDefaultLocale = defaultLocale ? [defaultLocale] : ['en-US'];
+	const fallbackDefaultLocale = defaultLocale ? [defaultLocale] : ['en-US'];
 
 	const loadResource = (language: string, namespace: string) =>
 		import(`./locales/${language}/${namespace}.json`);