feat: add snippet deletion functionality and enhance UI for snippet management

src/SnippetManager.js

@@ -149,4 +149,22 @@ export class SnippetManager {
         this.readOnlyMode = hasChanges && !this.isDraftVersion;
         this.editorManager.updateReadOnlyState(this.readOnlyMode);
     }
+
+    deleteSnippet(id) {
+        if (confirm('Are you sure you want to delete this snippet?')) {
+            this.snippets = this.snippets.filter(s => s.id !== id);
+            this.storageManager.saveSnippets(this.snippets);
+            
+            if (this.currentSnippetId === id) {
+                this.currentSnippetId = null;
+                if (this.snippets.length > 0) {
+                    this.loadSnippet(this.snippets[0].id);
+                } else {
+                    this.editorManager.setValue('');
+                }
+            }
+            
+            this.uiManager.renderSnippetList(this.snippets, this.currentSnippetId);
+        }
+    }
 }

src/UIManager.js

@@ -19,10 +19,25 @@ export class UIManager {
         snippets.forEach(snippet => {
             const div = document.createElement('div');
             div.className = `snippet-item ${snippet.id === currentSnippetId ? 'active' : ''}`;
+            div.onclick = () => this.snippetManager.loadSnippet(snippet.id);
+            
             const hasChanges = this.snippetManager.hasDraftChanges(snippet.id);
             const indicator = hasChanges ? '🟡' : '🟢';
-            div.textContent = `${indicator} ${snippet.name}`;
-            div.onclick = () => this.snippetManager.loadSnippet(snippet.id);
+            
+            const contentDiv = document.createElement('div');
+            contentDiv.className = 'snippet-content';
+            contentDiv.textContent = `${indicator} ${snippet.name}`;
+            div.appendChild(contentDiv);
+
+            const deleteButton = document.createElement('button');
+            deleteButton.className = 'delete-snippet';
+            deleteButton.innerHTML = '❌';
+            deleteButton.onclick = (e) => {
+                e.stopPropagation();
+                this.snippetManager.deleteSnippet(snippet.id);
+            };
+            div.appendChild(deleteButton);
+            
             container.appendChild(div);
         });
     }

src/styles.css

@@ -0,0 +1,148 @@
+#vis {
+    width: 100%;
+    height: 100%;
+    padding: 1rem;
+}
+
+* {
+    margin: 0;
+    padding: 0;
+    box-sizing: border-box;
+}
+
+.container {
+    display: grid;
+    grid-template-columns: var(--snippet-width, 1fr) 5px var(--editor-width, 1fr) 5px var(--preview-width, 2fr);
+    height: 100vh;
+    background-color: #e0e0e0;
+}
+
+.panel {
+    background: white;
+    overflow-y: auto;
+    display: flex;
+    flex-direction: column;
+}
+
+.panel-header {
+    padding: 1rem;
+    border-bottom: 1px solid #e0e0e0;
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    background: #f5f5f5;
+}
+
+.resize-handle {
+    background-color: #e0e0e0;
+    cursor: col-resize;
+    transition: background-color 0.2s;
+}
+
+.resize-handle:hover,
+.resize-handle.active {
+    background-color: #2196F3;
+}
+
+.button {
+    padding: 0.5rem 1rem;
+    background: #4CAF50;
+    color: white;
+    border: none;
+    border-radius: 4px;
+    cursor: pointer;
+    font-size: 14px;
+}
+
+.button:hover {
+    background: #45a049;
+}
+
+.button:disabled {
+    background: #cccccc;
+    cursor: not-allowed;
+}
+
+.button.secondary {
+    background: #607D8B;
+}
+
+.button.secondary:hover {
+    background: #546E7A;
+}
+
+.snippet-list {
+    padding: 1rem;
+    flex-grow: 1;
+}
+
+.snippet-item {
+    padding: 0.75rem;
+    margin: 0.5rem 0;
+    background: #f5f5f5;
+    border-radius: 4px;
+    cursor: pointer;
+    transition: background 0.2s;
+}
+
+.snippet-item:hover {
+    background: #eeeeee;
+}
+
+.snippet-item.active {
+    background: #e3f2fd;
+    border-left: 4px solid #2196F3;
+}
+
+#monaco-editor {
+    height: 100%;
+    flex-grow: 1;
+}
+
+.preview-panel>*:not(.panel-header) {
+    padding: 1rem;
+}
+
+.editor-controls {
+    display: flex;
+    gap: 0.5rem;
+    align-items: center;
+}
+
+.snippet-item {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    padding: 8px;
+    cursor: pointer;
+    gap: 8px;
+}
+
+.snippet-item span {
+    cursor: pointer;
+}
+
+.snippet-content {
+    flex: 1;
+    overflow: hidden;
+    text-overflow: ellipsis;
+    white-space: nowrap;
+}
+
+.delete-snippet {
+    opacity: 0.4;
+    font-size: 14px;
+    padding: 2px 4px;
+    background: none;
+    border: none;
+    cursor: pointer;
+    min-width: 24px;
+}
+
+.delete-snippet:hover {
+    opacity: 1;
+}
+
+.snippet-item:hover .delete-snippet {
+    opacity: 0.8;
+}