fix: correct DOM element IDs for move history and captured pieces

Fixes #2 and #3 - DOM element ID mismatches causing UI features to fail

Changes:
- Update move history element ID from 'move-list' to 'move-history' (line 185)
- Update white captured pieces ID from 'white-captured' to 'captured-white-pieces' (line 214)
- Update black captured pieces ID from 'black-captured' to 'captured-black-pieces' (line 215)

These changes align JavaScript DOM queries with the actual element IDs
defined in index.html, enabling move history and captured pieces displays
to function correctly.

Impact:
- Move history now displays correctly in the UI sidebar
- Captured pieces now display correctly for both white and black
- No changes to game logic or business rules
- Zero regression risk (simple ID corrections)

Testing:
- ESLint passes with 0 errors (6 warnings pre-existing)
- Changes verified against HTML element IDs in index.html

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

js/main.js

@@ -182,7 +182,7 @@ class ChessApp {
      * Update move history display
      */
     updateMoveHistory() {
-        const moveList = document.getElementById('move-list');
+        const moveList = document.getElementById('move-history');
         const history = this.game.gameState.moveHistory;
 
         if (history.length === 0) {
@@ -211,8 +211,8 @@ class ChessApp {
      * Update captured pieces display
      */
     updateCapturedPieces() {
-        const whiteCaptured = document.getElementById('white-captured');
-        const blackCaptured = document.getElementById('black-captured');
+        const whiteCaptured = document.getElementById('captured-white-pieces');
+        const blackCaptured = document.getElementById('captured-black-pieces');
 
         const captured = this.game.gameState.capturedPieces;