feat: redesign help modal with enhanced hero section, improved navigation styling, and card-based layout

- Increase help container max-width from 960px to 1320px for wider layout
- Add overflow-y auto and scroll-behavior smooth to help-body
- Redesign help navigation with wider sidebar (260px), softer background colors, and rounded pill-style links
- Add emoji icons to all navigation menu items for better visual hierarchy
- Transform navigation links with rounded borders, gradient backgrounds on

frontend/style.css

@@ -1978,7 +1978,7 @@ select {
   display: flex;
 }
 .help-container {
-  max-width: 960px;
+  max-width: 1320px;
 }
 .editor-container {
   background: var(--bg-secondary);
@@ -2057,20 +2057,25 @@ select {
   background: radial-gradient(circle at top right, color-mix(in srgb, var(--accent) 10%, transparent), transparent 30%), var(--bg-primary);
   display: flex;
   gap: 0;
+  overflow-y: auto;
+  overflow-x: hidden;
+  scroll-behavior: smooth;
 }
 
 /* Help Navigation Menu */
 .help-nav {
-  width: 220px;
-  min-width: 220px;
-  background: var(--bg-secondary);
-  border-right: 1px solid var(--border);
-  padding: 20px 0;
-  overflow-y: auto;
+  width: 260px;
+  min-width: 260px;
+  background: color-mix(in srgb, var(--bg-secondary) 94%, var(--bg-primary));
+  border-right: 1px solid color-mix(in srgb, var(--border) 85%, transparent);
+  padding: 24px 0;
+  overflow: visible;
   position: sticky;
   top: 0;
-  height: calc(90vh - 60px);
+  align-self: flex-start;
+  max-height: none;
   flex-shrink: 0;
+  backdrop-filter: blur(12px);
 }
 .help-nav-title {
   font-family: "JetBrains Mono", monospace;
@@ -2079,52 +2084,56 @@ select {
   text-transform: uppercase;
   letter-spacing: 0.05em;
   color: var(--text-muted);
-  padding: 0 20px 12px;
-  border-bottom: 1px solid var(--border);
-  margin-bottom: 8px;
+  padding: 0 22px 14px;
+  border-bottom: 1px solid color-mix(in srgb, var(--border) 85%, transparent);
+  margin-bottom: 12px;
 }
 .help-nav-list {
   list-style: none;
   margin: 0;
-  padding: 0;
+  padding: 0 12px;
 }
 .help-nav-list li {
-  margin: 0;
+  margin: 0 0 6px;
 }
 .help-nav-link {
   display: block;
-  padding: 8px 20px;
-  font-size: 0.85rem;
+  padding: 10px 12px;
+  font-size: 0.88rem;
   color: var(--text-secondary);
   text-decoration: none;
   transition: all 150ms ease;
-  border-left: 3px solid transparent;
+  border: 1px solid transparent;
+  border-radius: 12px;
 }
 .help-nav-link:hover {
   color: var(--accent);
-  background: var(--bg-hover);
+  background: color-mix(in srgb, var(--bg-hover) 80%, transparent);
+  border-color: color-mix(in srgb, var(--accent) 16%, transparent);
   text-decoration: none;
+  transform: translateX(2px);
 }
 .help-nav-link.active {
   color: var(--accent);
-  background: color-mix(in srgb, var(--accent) 10%, transparent);
-  border-left-color: var(--accent);
+  background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 16%, transparent), color-mix(in srgb, var(--accent) 7%, transparent));
+  border-color: color-mix(in srgb, var(--accent) 22%, transparent);
   font-weight: 600;
+  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--accent) 10%, transparent);
 }
 
 .help-content {
   flex: 1;
-  max-width: 920px;
+  max-width: 980px;
   margin: 0 auto;
-  padding: 28px 32px 40px;
-  overflow-y: auto;
+  padding: 32px 40px 56px;
+  overflow: visible;
   min-width: 0;
 }
 .help-lead {
-  font-size: 1.05rem;
-  line-height: 1.6;
+  font-size: 1.08rem;
+  line-height: 1.75;
   color: var(--text-primary);
-  margin-bottom: 16px;
+  margin-bottom: 18px;
 }
 .help-footer {
   margin-top: 48px;
@@ -2148,25 +2157,27 @@ select {
   color: var(--text-primary);
 }
 .help-content h1 {
-  font-size: 1.6rem;
+  font-size: 2rem;
   margin-bottom: 16px;
+  letter-spacing: -0.02em;
 }
 .help-content h2 {
-  font-size: 1.05rem;
-  margin: 24px 0 10px;
+  font-size: 1.18rem;
+  margin: 0 0 14px;
 }
 .help-content h3 {
-  font-size: 0.9rem;
-  margin: 16px 0 6px;
+  font-size: 0.95rem;
+  margin: 20px 0 8px;
   color: var(--text-secondary);
 }
 .help-content p {
-  margin: 0 0 12px;
+  margin: 0 0 14px;
   color: var(--text-secondary);
+  line-height: 1.7;
 }
 .help-content ul,
 .help-content ol {
-  margin: 8px 0 16px;
+  margin: 10px 0 18px;
   padding-left: 24px;
   color: var(--text-secondary);
 }
@@ -2189,6 +2200,25 @@ select {
   font-weight: 600;
 }
 
+.help-section {
+  position: relative;
+  margin-bottom: 22px;
+  padding: 24px 26px;
+  border: 1px solid color-mix(in srgb, var(--border) 82%, transparent);
+  border-radius: 18px;
+  background: linear-gradient(180deg, color-mix(in srgb, var(--bg-secondary) 94%, var(--bg-primary)), color-mix(in srgb, var(--bg-secondary) 86%, var(--bg-primary)));
+  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.18);
+}
+
+.help-section::before {
+  content: "";
+  position: absolute;
+  inset: 0;
+  border-radius: inherit;
+  pointer-events: none;
+  background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 8%, transparent), transparent 35%);
+}
+
 .help-hero {
   display: grid;
   grid-template-columns: minmax(0, 1.5fr) minmax(260px, 1fr);