diff --git a/index.html b/index.html
index c12d6b8..52838af 100644
--- a/index.html
+++ b/index.html
@@ -28,13 +28,13 @@
     <div class="app-container">
         <!-- Toggle Button Strip -->
         <div class="toggle-strip">
-            <button class="toggle-btn active" id="toggle-snippets" title="Toggle Snippets Panel">
+            <button class="toggle-btn active" id="toggle-snippet-panel" title="Toggle Snippets Panel">
                 📄
             </button>
-            <button class="toggle-btn active" id="toggle-editor" title="Toggle Editor Panel">
+            <button class="toggle-btn active" id="toggle-editor-panel" title="Toggle Editor Panel">
                 ✏️
             </button>
-            <button class="toggle-btn active" id="toggle-preview" title="Toggle Preview Panel">
+            <button class="toggle-btn active" id="toggle-preview-panel" title="Toggle Preview Panel">
                 👁️
             </button>
         </div>
@@ -130,107 +130,6 @@
     <script src="src/js/panel-manager.js"></script>
     <script src="src/js/editor.js"></script>
     <script src="src/js/app.js"></script>
-
-    <script>
-
-        document.addEventListener('DOMContentLoaded', function () {
-            // Initialize snippet storage and render list
-            initializeSnippetsStorage();
-
-            // Initialize sort controls
-            initializeSortControls();
-
-            // Initialize search controls
-            initializeSearchControls();
-
-            renderSnippetList();
-
-            // Load saved layout
-            loadLayoutFromStorage();
-
-            // Initialize resize functionality
-            initializeResize();
-
-            // Initialize Monaco Editor
-            require.config({ paths: { vs: 'https://cdnjs.cloudflare.com/ajax/libs/monaco-editor/0.47.0/min/vs' } });
-            require(['vs/editor/editor.main'], async function () {
-                // Fetch actual Vega-Lite schema JSON for better validation
-                let vegaLiteSchema;
-                try {
-                    const response = await fetch('https://vega.github.io/schema/vega-lite/v5.json');
-                    vegaLiteSchema = await response.json();
-                } catch (error) {
-                    vegaLiteSchema = null;
-                }
-
-                // Configure JSON language with actual schema
-                if (vegaLiteSchema) {
-                    monaco.languages.json.jsonDefaults.setDiagnosticsOptions({
-                        validate: true,
-                        schemas: [{
-                            uri: "https://vega.github.io/schema/vega-lite/v5.json",
-                            fileMatch: ["*"], // Associate with all files
-                            schema: vegaLiteSchema
-                        }]
-                    });
-                }
-
-                // Load Vega libraries before creating editor
-                await loadVegaLibraries();
-
-                // Create the editor with improved configuration
-                editor = monaco.editor.create(document.getElementById('monaco-editor'), {
-                    value: JSON.stringify(sampleSpec, null, 2),
-                    language: 'json',
-                    theme: 'vs-light',
-                    fontSize: 12,
-                    minimap: { enabled: false },
-                    scrollBeyondLastLine: false,
-                    automaticLayout: true,
-                    wordWrap: 'on',
-                    formatOnPaste: true,
-                    formatOnType: true
-                });
-
-                // Add debounced auto-render on editor change
-                editor.onDidChangeModelContent(() => {
-                    debouncedRender();
-                });
-
-                // Initial render
-                renderVisualization();
-
-                // Initialize auto-save functionality
-                initializeAutoSave();
-            });
-
-            // Enhanced toggle functionality with memory and expansion
-            const toggleButtons = document.querySelectorAll('.toggle-btn');
-            toggleButtons.forEach(button => {
-                button.addEventListener('click', function () {
-                    const panelId = this.id.replace('toggle-', ''); // Remove 'toggle-' prefix
-                    togglePanel(panelId);
-                });
-            });
-
-            // Snippet selection is now handled by snippet-manager.js
-
-            // Header link handlers
-            const headerLinks = document.querySelectorAll('.header-link');
-            headerLinks.forEach(link => {
-                link.addEventListener('click', function () {
-                    const linkText = this.textContent.trim();
-                    switch (linkText) {
-                        case 'Import':
-                        case 'Export':
-                        case 'Help':
-                            // TODO: Implement in future phases
-                            break;
-                    }
-                });
-            });
-        });
-    </script>
 </body>
 
 </html>
\ No newline at end of file
diff --git a/src/js/app.js b/src/js/app.js
index e69de29..460e997 100644
--- a/src/js/app.js
+++ b/src/js/app.js
@@ -0,0 +1,89 @@
+// Application initialization and event handlers
+
+document.addEventListener('DOMContentLoaded', function () {
+    // Initialize snippet storage and render list
+    initializeSnippetsStorage();
+
+    // Initialize sort controls
+    initializeSortControls();
+
+    // Initialize search controls
+    initializeSearchControls();
+
+    renderSnippetList();
+
+    // Load saved layout
+    loadLayoutFromStorage();
+
+    // Initialize resize functionality
+    initializeResize();
+
+    // Initialize Monaco Editor
+    require.config({ paths: { vs: 'https://cdnjs.cloudflare.com/ajax/libs/monaco-editor/0.47.0/min/vs' } });
+    require(['vs/editor/editor.main'], async function () {
+        // Fetch Vega-Lite schema for validation
+        let vegaLiteSchema;
+        try {
+            const response = await fetch('https://vega.github.io/schema/vega-lite/v5.json');
+            vegaLiteSchema = await response.json();
+        } catch (error) {
+            vegaLiteSchema = null;
+        }
+
+        // Configure JSON language with schema
+        if (vegaLiteSchema) {
+            monaco.languages.json.jsonDefaults.setDiagnosticsOptions({
+                validate: true,
+                schemas: [{
+                    uri: "https://vega.github.io/schema/vega-lite/v5.json",
+                    fileMatch: ["*"],
+                    schema: vegaLiteSchema
+                }]
+            });
+        }
+
+        // Load Vega libraries before creating editor
+        await loadVegaLibraries();
+
+        // Create the editor
+        editor = monaco.editor.create(document.getElementById('monaco-editor'), {
+            value: JSON.stringify(sampleSpec, null, 2),
+            language: 'json',
+            theme: 'vs-light',
+            fontSize: 12,
+            minimap: { enabled: false },
+            scrollBeyondLastLine: false,
+            automaticLayout: true,
+            wordWrap: 'on',
+            formatOnPaste: true,
+            formatOnType: true
+        });
+
+        // Add debounced auto-render on editor change
+        editor.onDidChangeModelContent(() => {
+            debouncedRender();
+            debouncedAutoSave();
+        });
+
+        // Initial render
+        renderVisualization();
+
+        // Initialize auto-save functionality
+        initializeAutoSave();
+    });
+
+    // Toggle panel buttons
+    document.querySelectorAll('.toggle-btn').forEach(button => {
+        button.addEventListener('click', function () {
+            const panelId = this.id.replace('toggle-', '');
+            togglePanel(panelId);
+        });
+    });
+
+    // Header links - show placeholder
+    document.querySelectorAll('.header-link').forEach(link => {
+        link.addEventListener('click', function () {
+            alert('Coming soon in a future phase!');
+        });
+    });
+});
diff --git a/src/js/editor.js b/src/js/editor.js
index 866349a..2ea6129 100644
--- a/src/js/editor.js
+++ b/src/js/editor.js
@@ -28,14 +28,14 @@ async function renderVisualization() {
 
 // Debounced render function
 function debouncedRender() {
-    clearTimeout(renderTimeout);
-
-    // If we're updating the editor programmatically, render immediately
+    // Don't debounce if we're programmatically updating - render immediately
     if (window.isUpdatingEditor) {
         renderVisualization();
-    } else {
-        renderTimeout = setTimeout(renderVisualization, 1500); // 1.5s delay for user edits
+        return;
     }
+
+    clearTimeout(renderTimeout);
+    renderTimeout = setTimeout(renderVisualization, 1500);
 }
 
 // Load Vega libraries dynamically with UMD builds
diff --git a/src/js/panel-manager.js b/src/js/panel-manager.js
index 289f19f..ea3cef4 100644
--- a/src/js/panel-manager.js
+++ b/src/js/panel-manager.js
@@ -18,22 +18,10 @@ function updatePanelMemory() {
 
 
 function togglePanel(panelId) {
+    const panel = document.getElementById(panelId);
+    const button = document.getElementById(`toggle-${panelId}`);
 
-    // Fix ID mapping - buttons use plural, panels use singular
-    const panelIdMap = {
-        'snippets': 'snippet-panel',
-        'editor': 'editor-panel',
-        'preview': 'preview-panel'
-    };
-
-    const actualPanelId = panelIdMap[panelId];
-    const panel = document.getElementById(actualPanelId);
-    const button = document.getElementById('toggle-' + panelId);
-
-
-    if (!panel || !button) {
-        return;
-    }
+    if (!panel || !button) return;
 
     if (panel.style.display === 'none') {
         // Show panel
@@ -126,9 +114,9 @@ function loadLayoutFromStorage() {
             previewPanel.style.display = layout.previewVisible !== false ? 'flex' : 'none';
 
             // Update toggle button states
-            document.getElementById('toggle-snippets').classList.toggle('active', layout.snippetVisible !== false);
-            document.getElementById('toggle-editor').classList.toggle('active', layout.editorVisible !== false);
-            document.getElementById('toggle-preview').classList.toggle('active', layout.previewVisible !== false);
+            document.getElementById('toggle-snippet-panel').classList.toggle('active', layout.snippetVisible !== false);
+            document.getElementById('toggle-editor-panel').classList.toggle('active', layout.editorVisible !== false);
+            document.getElementById('toggle-preview-panel').classList.toggle('active', layout.previewVisible !== false);
 
             // Restore widths and redistribute
             snippetPanel.style.width = layout.snippetWidth;
diff --git a/src/js/snippet-manager.js b/src/js/snippet-manager.js
index ae7b927..f2f363b 100644
--- a/src/js/snippet-manager.js
+++ b/src/js/snippet-manager.js
@@ -8,14 +8,9 @@ function generateSnippetId() {
 // Generate auto-populated name with current datetime
 function generateSnippetName() {
     const now = new Date();
-    const year = now.getFullYear();
-    const month = String(now.getMonth() + 1).padStart(2, '0');
-    const day = String(now.getDate()).padStart(2, '0');
-    const hours = String(now.getHours()).padStart(2, '0');
-    const minutes = String(now.getMinutes()).padStart(2, '0');
-    const seconds = String(now.getSeconds()).padStart(2, '0');
+    const pad = (n) => String(n).padStart(2, '0');
 
-    return `${year}-${month}-${day}_${hours}-${minutes}-${seconds}`;
+    return `${now.getFullYear()}-${pad(now.getMonth() + 1)}-${pad(now.getDate())}_${pad(now.getHours())}-${pad(now.getMinutes())}-${pad(now.getSeconds())}`;
 }
 
 // Create a new snippet using Phase 0 schema
@@ -174,19 +169,12 @@ function initializeSnippetsStorage() {
 // Format date for display in snippet list
 function formatSnippetDate(isoString) {
     const date = new Date(isoString);
-    const now = new Date();
-    const diffMs = now - date;
-    const diffDays = Math.floor(diffMs / (1000 * 60 * 60 * 24));
+    const diffDays = Math.floor((new Date() - date) / (1000 * 60 * 60 * 24));
 
-    if (diffDays === 0) {
-        return date.toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' });
-    } else if (diffDays === 1) {
-        return 'Yesterday';
-    } else if (diffDays < 7) {
-        return `${diffDays} days ago`;
-    } else {
-        return date.toLocaleDateString();
-    }
+    if (diffDays === 0) return date.toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' });
+    if (diffDays === 1) return 'Yesterday';
+    if (diffDays < 7) return `${diffDays} days ago`;
+    return date.toLocaleDateString();
 }
 
 // Format full date/time for display in meta info
@@ -409,9 +397,7 @@ function clearSelection() {
     if (editor) {
         window.isUpdatingEditor = true;
         editor.setValue('{}');
-        setTimeout(() => {
-            window.isUpdatingEditor = false;
-        }, 50);
+        window.isUpdatingEditor = false;
     }
 
     // Hide meta panel and show placeholder
@@ -459,9 +445,7 @@ function selectSnippet(snippetId) {
     if (editor) {
         window.isUpdatingEditor = true;
         editor.setValue(JSON.stringify(snippet.draftSpec, null, 2));
-        setTimeout(() => {
-            window.isUpdatingEditor = false;
-        }, 50); // Small delay to ensure setValue completes
+        window.isUpdatingEditor = false;
     }
 
     // Show and populate meta fields
@@ -524,12 +508,6 @@ function debouncedAutoSave() {
 
 // Initialize auto-save on editor changes
 function initializeAutoSave() {
-    if (editor) {
-        editor.onDidChangeModelContent(() => {
-            debouncedAutoSave();
-        });
-    }
-
     // Initialize meta fields auto-save
     const nameField = document.getElementById('snippet-name');
     const commentField = document.getElementById('snippet-comment');
@@ -651,19 +629,7 @@ function deleteSnippet(snippetId) {
 
         // If we deleted the currently selected snippet, clear selection
         if (window.currentSnippetId === snippetId) {
-            window.currentSnippetId = null;
-            if (editor) {
-                window.isUpdatingEditor = true;
-                editor.setValue('{}');
-                setTimeout(() => {
-                    window.isUpdatingEditor = false;
-                }, 50);
-            }
-            // Hide comment field and show placeholder
-            const metaSection = document.getElementById('snippet-meta');
-            const placeholder = document.querySelector('.placeholder');
-            if (metaSection) metaSection.style.display = 'none';
-            if (placeholder) placeholder.style.display = 'block';
+            clearSelection();
         }
 
         // Refresh the list