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

jest.config.ts

@@ -14,7 +14,10 @@ const config: Config = {
     setupFilesAfterEnv: ['<rootDir>/jest.setup.ts'],
     moduleNameMapper: {
         '^@/(.*)$': '<rootDir>/src/$1',
-    }
+    },
+    transformIgnorePatterns: [
+        'node_modules/(?!(react-markdown|remark-.*|unified|bail|is-plain-obj|trough|vfile|unist-.*|mdast-.*|micromark.*|decode-named-character-reference|character-entities|property-information|hast-util-whitespace|space-separated-tokens|comma-separated-tokens|ccount|escape-string-regexp|markdown-table)/)',
+    ],
 }
 
 // createJestConfig is exported this way to ensure that next/jest can load the Next.js config which is async