Fix all ESLint errors across project

app.js

@@ -3,14 +3,12 @@
  * Haupt-Application
  */
 
-const PLAYER_NAME = 'Kiesewetter, Lara';
+/* global $, parsePGN, filterLaraGames, getLiveGame, getLatestGame, Chess, Chessboard */
 
 let board = null;
 let chess = null;
 let currentGame = null;
 let allLaraGames = [];
-let serverLastFetch = null;
-let laraColor = null;
 let currentMoveIndex = -1;
 let userSelectedGame = false;
 let userScrolledMoves = false;
@@ -89,14 +87,13 @@ function updateBoard() {
     // Spiegele das Brett, wenn Lara Schwarz hat
     const laraIsBlack = currentGame.black.toLowerCase().includes('kiesewetter');
     const orientation = laraIsBlack ? 'black' : 'white';
-    laraColor = laraIsBlack ? 'b' : 'w';
     
     // Führe alle Züge aus
     const nonResultMoves = currentGame.moves.filter(m => !m.isResult);
     for (const move of nonResultMoves) {
         try {
             chess.move(move.san);
-        } catch (e) {
+        } catch {
             // Ignoriere ungültige Züge
         }
     }
@@ -108,7 +105,7 @@ function updateBoard() {
         for (let i = 0; i <= currentMoveIndex && i < nonResultMoves.length; i++) {
             try {
                 chess.move(nonResultMoves[i].san);
-            } catch (e) {
+            } catch {
                 break;
             }
         }
@@ -153,7 +150,7 @@ function goToMove(index) {
     for (let i = 0; i <= index; i++) {
         try {
             chess.move(nonResultMoves[i].san);
-        } catch (err) {
+        } catch {
             break;
         }
     }
@@ -265,21 +262,19 @@ function highlightActivePlayer() {
  * Highlight den letzten Zug auf dem Brett
  */
 function highlightLastMove() {
-    if (!board || !chess) return;
+    if (!board || !chess || !currentGame) return;
+    
+    $('#board [data-square]').removeClass('last-move-highlight');
     
     const nonResultMoves = currentGame.moves.filter(m => !m.isResult);
     
     if (currentMoveIndex >= 0 && currentMoveIndex < nonResultMoves.length) {
-        const lastMove = nonResultMoves[currentMoveIndex];
-        
-        // Parse die SAN-Züge, um Start- und Zielfelder zu finden
         const moves = chess.history({ verbose: true });
         if (moves.length > 0) {
             const lastMoveData = moves[moves.length - 1];
-            board.highlightSquare(lastMoveData.from, lastMoveData.to);
+            $(`#board [data-square="${lastMoveData.from}"]`).addClass('last-move-highlight');
+            $(`#board [data-square="${lastMoveData.to}"]`).addClass('last-move-highlight');
         }
-    } else {
-        board.clearHighlights();
     }
 }
 
@@ -501,12 +496,11 @@ async function updateStandings() {
                         <span class="standings-value">${data.losses}</span>
                     </div>
                 `;
-                serverLastFetch = Date.now();
                 return;
             }
         }
         document.getElementById('standings-content').innerHTML = '<div class="standings-loading">Daten nicht verfügbar</div>';
-    } catch (err) {
+    } catch {
         document.getElementById('standings-content').innerHTML = '<div class="standings-loading">Daten nicht verfügbar</div>';
     }
 }
@@ -564,11 +558,6 @@ function showLoading(show) {
     document.getElementById('loading-overlay').style.display = show ? 'flex' : 'none';
 }
 
-function showError(msg) {
-    document.getElementById('error-message').textContent = msg;
-    document.getElementById('error-overlay').style.display = 'flex';
-}
-
 function hideError() {
     document.getElementById('error-overlay').style.display = 'none';
 }
@@ -609,8 +598,6 @@ document.getElementById('copy-pgn-btn').addEventListener('click', async () => {
 document.addEventListener('keydown', (e) => {
     if (!currentGame) return;
     
-    const nonResultMoves = currentGame.moves.filter(m => !m.isResult);
-    
     if (e.key === 'ArrowLeft') {
         e.preventDefault();
         goToMove(currentMoveIndex - 1);