refactor: improve mobile layout, sticky footer, and UI spacing

src/components/Sidebar.vue

@@ -17,20 +17,42 @@ defineProps({
 
 <style scoped>
 .sidebar {
-  width: 0;
+  /* Mobile First Styles */
+  position: fixed;
+  top: 0;
+  left: 0;
+  bottom: 0;
+  width: 250px;
   background-color: var(--panel-bg);
   backdrop-filter: blur(12px);
   -webkit-backdrop-filter: blur(12px);
   overflow-x: hidden;
-  transition: width 0.3s ease;
+  transition: transform 0.3s ease;
   border-right: 1px solid var(--panel-border);
-  flex-shrink: 0;
-  height: 100%;
+  z-index: 1000;
   box-shadow: var(--panel-shadow);
+  transform: translateX(-100%);
 }
 
 .sidebar.is-open {
-  width: 250px;
+  transform: translateX(0);
+}
+
+@media (min-width: 768px) {
+  .sidebar {
+    position: static;
+    transform: none;
+    width: 0;
+    height: auto;
+    transition: width 0.3s ease;
+    z-index: auto;
+    box-shadow: none; /* Shadow handled by panel logic or not needed inline */
+  }
+
+  .sidebar.is-open {
+    width: 250px;
+    transform: none;
+  }
 }
 
 .sidebar-nav {
@@ -38,11 +60,19 @@ defineProps({
   display: flex;
   flex-direction: column;
   width: 250px; /* Fixed width for content */
+  min-width: 250px;
+  padding-top: 1rem; /* Add some top padding for mobile aesthetic */
+}
+
+@media (min-width: 768px) {
+  .sidebar-nav {
+    padding-top: 0;
+  }
 }
 
 .nav-item {
   display: block;
-  padding: 0.5rem;
+  padding: 0.75rem 1rem;
   color: var(--text-secondary);
   text-decoration: none;
   transition: background-color 0.2s, color 0.2s;