feat: Refonte moderne du panneau de notes avec design latéral

- Transformation en panneau latéral droit au lieu du bas
- Header avec gradient violet et design moderne
- Ajout bouton Effacer et amélioration du placeholder
- Suppression du badge rouge de notification
- Animations fluides et redimensionnement automatique de la webview
- Interface plus cohérente et intuitive

styles-modern.css

@@ -612,95 +612,171 @@ body {
     border: none;
 }
 
-/* === ZONE DE NOTES === */
+/* === ZONE DE NOTES - PANNEAU LATÉRAL === */
 .notes-section {
+    position: fixed;
+    top: 60px; /* Juste sous le header */
+    right: -400px; /* Caché par défaut */
+    width: 380px;
+    height: calc(100vh - 60px);
     background: white;
-    border-top: 2px solid #667eea;
-    position: absolute;
-    bottom: 0;
-    left: 0;
-    right: 0;
-    transition: transform 0.3s ease;
-    transform: translateY(100%);
-    box-shadow: 0 -4px 12px rgba(0,0,0,0.1);
+    box-shadow: -4px 0 20px rgba(0,0,0,0.1);
+    transition: right 0.3s cubic-bezier(0.4, 0, 0.2, 1);
     z-index: 100;
+    display: flex;
+    flex-direction: column;
+    border-left: 1px solid #e1e4e8;
 }
 
 .notes-section.visible {
-    transform: translateY(0);
+    right: 0;
+    animation: slideInRight 0.3s ease-out;
+}
+
+@keyframes slideInRight {
+    from {
+        right: -400px;
+        opacity: 0;
+    }
+    to {
+        right: 0;
+        opacity: 1;
+    }
 }
 
 .notes-header {
     display: flex;
     justify-content: space-between;
     align-items: center;
-    padding: 15px 20px;
-    background: #f8f9fa;
-    border-bottom: 1px solid #e9ecef;
+    padding: 20px;
+    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+    border-bottom: none;
 }
 
 .notes-header h4 {
     margin: 0;
-    color: #333;
-    font-size: 16px;
+    color: white;
+    font-size: 18px;
     font-weight: 600;
+    display: flex;
+    align-items: center;
+    gap: 10px;
+}
+
+.notes-header h4::before {
+    content: '📝';
+    font-size: 20px;
 }
 
 .btn-close-notes {
-    background: none;
+    background: rgba(255, 255, 255, 0.2);
     border: none;
-    font-size: 24px;
-    color: #999;
+    font-size: 20px;
+    color: white;
     cursor: pointer;
     padding: 0;
-    width: 30px;
-    height: 30px;
+    width: 32px;
+    height: 32px;
     display: flex;
     align-items: center;
     justify-content: center;
-    border-radius: 4px;
+    border-radius: 50%;
     transition: all 0.2s;
 }
 
 .btn-close-notes:hover {
-    background: white;
-    color: #333;
+    background: rgba(255, 255, 255, 0.3);
+    transform: scale(1.1);
 }
 
 .notes-section textarea {
+    flex: 1;
     width: 100%;
-    min-height: 120px;
-    padding: 15px 20px;
+    padding: 20px;
     border: none;
     resize: none;
-    font-family: inherit;
+    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
     font-size: 14px;
-    line-height: 1.5;
+    line-height: 1.6;
+    background: #fafbfc;
 }
 
 .notes-section textarea:focus {
     outline: none;
+    background: white;
+}
+
+.notes-section textarea::placeholder {
+    color: #959da5;
+    font-style: italic;
+}
+
+.notes-footer {
+    padding: 15px 20px;
+    background: white;
+    border-top: 1px solid #e1e4e8;
+    display: flex;
+    gap: 10px;
 }
 
 .btn-small {
-    margin: 0 20px 15px 20px;
-    padding: 8px 20px;
-    background: #667eea;
+    flex: 1;
+    padding: 10px 20px;
+    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
     color: white;
     border: none;
-    border-radius: 6px;
+    border-radius: 8px;
     cursor: pointer;
     font-size: 14px;
-    font-weight: 500;
+    font-weight: 600;
     transition: all 0.2s;
 }
 
 .btn-small:hover {
-    background: #5a6fd8;
     transform: translateY(-2px);
-    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.25);
+    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
 }
 
+.btn-small.btn-clear {
+    flex: 0.5;
+    background: #f1f3f5;
+    color: #495057;
+}
+
+.btn-small.btn-clear:hover {
+    background: #e9ecef;
+    box-shadow: none;
+}
+
+/* Ajustement de la webview quand les notes sont visibles */
+.webview-container.notes-open {
+    margin-right: 380px;
+    transition: margin-right 0.3s cubic-bezier(0.4, 0, 0.2, 1);
+}
+
+/* Tooltip moderne pour le bouton notes */
+.btn-icon[title]::after {
+    content: attr(title);
+    position: absolute;
+    bottom: -35px;
+    right: 0;
+    background: rgba(0, 0, 0, 0.9);
+    color: white;
+    padding: 6px 12px;
+    border-radius: 6px;
+    font-size: 12px;
+    white-space: nowrap;
+    opacity: 0;
+    pointer-events: none;
+    transition: opacity 0.3s;
+    z-index: 1000;
+}
+
+.btn-icon[title]:hover::after {
+    opacity: 1;
+}
+
+
 /* === MODAL === */
 .modal {
     display: none;