Complete tactic recognition module with tests and real-time integration

- Add comprehensive test suite (20 tests) for tactic detection
- Fix pawn detection threshold bug (200 -> 100 centipawns)
- Add error handling to uciToSan for invalid moves
- Integrate tactical data into Tutor component for real-time feedback
- Pass missedTactics from ChessGame to Tutor via props
- Update LLM prompt to explain missed tactical opportunities
- Fix Jest configuration to handle react-markdown ESM issues
- All 50 tests passing

src/components/__tests__/Tutor.test.tsx

@@ -45,6 +45,7 @@ describe('Tutor', () => {
         evalP0={null}
         evalP2={null}
         openingData={null}
+        missedTactics={null}
         onAnalysisComplete={() => {}}
         apiKey="test-api-key"
         personality={{
@@ -54,6 +55,7 @@ describe('Tutor', () => {
         }}
         language="en"
         playerColor="white"
+        onCheckComputerMove={() => {}}
       />
     );