chore: upgrade i18next 26, prettier 3, fontsource-variable, domhandler 6, lint-staged 17

- i18next 23->26 + react-i18next 15->17
- prettier 2->3, reformat all files
- replace @fontsource/inter with @fontsource-variable/inter 5, update import path
- domhandler 5->6 (aligns with transitive deps)
- lint-staged 16->17

src/app/plugins/bad-words.ts

@@ -4,12 +4,12 @@ import { sanitizeForRegex } from '../utils/regex';
 const additionalBadWords: string[] = ['torture', 't0rture'];
 
 const fullBadWordList = additionalBadWords.concat(
-  badWords.array.filter((word) => !additionalBadWords.includes(word))
+  badWords.array.filter((word) => !additionalBadWords.includes(word)),
 );
 
 export const BAD_WORDS_REGEX = new RegExp(
   `(\\b|_)(${fullBadWordList.map((word) => sanitizeForRegex(word)).join('|')})(\\b|_)`,
-  'g'
+  'g',
 );
 
 export const testBadWords = (str: string): boolean => !!str.toLowerCase().match(BAD_WORDS_REGEX);