refactor: remove dark mode CSS overrides and fix script tag closure in triptyque template

grille_triptyque_breakout_mercredi1.html

@@ -194,9 +194,7 @@
       text-align: center;
     }
     
-    body.dark-mode .timer-display {
-      text-shadow: 0 0 10px rgba(117, 95, 236, 0.3);
-    }
+
 
     .timer-controls {
       display: flex;
@@ -219,10 +217,7 @@
       box-shadow: var(--shadow-sm);
     }
     
-    body.dark-mode .tcbtn {
-      background: var(--bg-tertiary);
-      border-color: var(--color-border-primary);
-    }
+
 
     .tcbtn:hover {
       background: var(--primary);
@@ -765,10 +760,7 @@
         print-color-adjust: exact;
       }
       
-      body.dark-mode {
-        --bg-secondary: #ffffff !important;
-        --color-text-primary: #000000 !important;
-      }
+
       
       .wrap {
         max-width: 100% !important;
@@ -1073,7 +1065,6 @@
         localStorage.removeItem(`textarea_triptyque_${index}`);
       });
     }
-    }
   </script>
 </body>