Censor profanity: "..." on screen, spoken as "beep"

New profanity.js does whole-word matching against a Russian/English
root list (avoids false positives like "победа", "тебя", "сукно").
Applied once per message before it's used anywhere downstream
(display, TTS, AI reply input) — screen shows "..." in place of a
censored word, while the TTS text uses "бип" so it's heard as a beep
instead of read literally.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

profanity.js

@@ -0,0 +1,34 @@
+// Word-level profanity filter: matches whole words against a root list
+// (so a root like "еб" only censors words that start with it, not every
+// word containing that substring, e.g. "тебя", "победа").
+// Deliberately simple (no leetspeak/homoglyph handling) — extend PROFANE_ROOTS
+// below if you need broader coverage.
+
+const PROFANE_ROOTS = [
+  // Russian
+  'хуй', 'хуе', 'хуё', 'хуя', 'хует',
+  'пизд',
+  'бля',
+  'еб', 'ёб',
+  'муда', 'мудак', 'мудило',
+  'пидор', 'пидар', 'пидр',
+  'гондон', 'гандон',
+  'долбоеб', 'долбоёб',
+  'сука', 'суки', 'суке', 'суку', 'суками',
+  // English
+  'fuck', 'shit', 'bitch', 'cunt', 'dick', 'asshole', 'bastard',
+  'whore', 'slut', 'nigger', 'nigga', 'faggot', 'motherfuck',
+];
+
+const WORD_RE = /[а-яёА-ЯЁa-zA-Z]+/g;
+
+function isProfaneWord(word) {
+  const normalized = word.toLowerCase();
+  return PROFANE_ROOTS.some((root) => normalized.startsWith(root));
+}
+
+function censorText(text, replacement) {
+  return text.replace(WORD_RE, (word) => (isProfaneWord(word) ? replacement : word));
+}
+
+module.exports = { censorText };