refactor: code review improvements

- Add 30s timeout to Stockfish evaluation to prevent hanging promises
- Add FEN validation and depth cap (max 30) to Stockfish API route
- Create ErrorBoundary component with specialized fallbacks for chess game and tutor
- Extract useChessSounds hook for better audio management
- Add React.memo to EvaluationBar and CapturedPieces for performance
- Add useMemo to CapturedPieces for sorted pieces calculation
- Improve tacticDetection to return empty array instead of "none" type
- Add filterMeaningfulTactics and hasTactics helper functions
- Translate hardcoded UI strings (stockfishLevel, download, evalChange)
- Update translations for EN, DE, FR, IT, PL
- Add uuid to Jest transformIgnorePatterns for ESM compatibility
- Update tests to use new filterMeaningfulTactics function

src/components/Tutor.tsx

@@ -14,7 +14,7 @@ import ReactMarkdown from "react-markdown";
 
 import { useTranslation } from '@/lib/i18n/useTranslation';
 import { SupportedLanguage } from '@/lib/i18n/translations';
-import { DetectedTactic } from '@/lib/tacticDetection';
+import { DetectedTactic, filterMeaningfulTactics } from '@/lib/tacticDetection';
 import { useDebug } from '@/contexts/DebugContext';
 import { MoveHistoryItem } from './GameOverModal';
 import { parseGeminiError, GeminiErrorInfo, isGeminiError } from '@/lib/geminiErrorHandler';
@@ -582,7 +582,7 @@ INSTRUCTIONS:
                 // Tactical Analysis Instruction
                 let tacticalInstruction = "";
                 if (missedTactics && missedTactics.length > 0) {
-                    const meaningfulTactics = missedTactics.filter(t => t.tactic_type !== 'none');
+                    const meaningfulTactics = filterMeaningfulTactics(missedTactics);
                     if (meaningfulTactics.length > 0) {
                         const tacticDescriptions = meaningfulTactics.map(t => {
                             let desc = `- ${t.tactic_type.toUpperCase()}`;