fix(reference): show method icons in the API sidebar and text chips in the page cards

src/components/api-method.tsx

@@ -1,3 +1,15 @@
+import {
+  ArrowDownLeft,
+  ArrowUpRight,
+  Diff,
+  Eye,
+  ListChecks,
+  Repeat2,
+  Webhook,
+  X,
+  type LucideIcon,
+} from 'lucide-react';
+
 export const API_METHODS = [
   'GET',
   'POST',
@@ -11,20 +23,38 @@ export const API_METHODS = [
 
 export type ApiMethod = (typeof API_METHODS)[number];
 
+const methodIcons: Record<ApiMethod, LucideIcon> = {
+  GET: ArrowDownLeft,
+  POST: ArrowUpRight,
+  PUT: Repeat2,
+  PATCH: Diff,
+  DELETE: X,
+  HEAD: Eye,
+  OPTIONS: ListChecks,
+  WEBHOOK: Webhook,
+};
+
 export function parseApiMethod(value: unknown): ApiMethod | undefined {
   if (typeof value !== 'string') return undefined;
 
   const method = value.toUpperCase() as ApiMethod;
   return API_METHODS.includes(method) ? method : undefined;
 }
 
+// The page tree holds one element for a method, and the sidebar and the
+// previous and next cards each show a different part of it (app.css).
 export function ApiMethod({ method }: { method: ApiMethod }) {
+  const Icon = methodIcons[method];
+
   return (
     <span
       className={`marfa-api-method marfa-api-method--${method.toLowerCase()}`}
       title={method === 'WEBHOOK' ? 'Webhook' : `${method} method`}
     >
-      {method}
+      <span className="marfa-api-method-icon" aria-hidden="true">
+        <Icon />
+      </span>
+      <span className="marfa-api-method-label">{method}</span>
     </span>
   );
 }

src/styles/app.css

@@ -207,22 +207,45 @@
   max-width: none;
 }
 
-/* A method label is the method in its colour, as text. In the sidebar it has
-   a fixed width, so every endpoint title starts in the same place. */
+/* A method is its colour, as a small chip. The chip holds the method's icon
+   and its name, and each place shows one: the sidebar the icon, a previous or
+   next card the name. */
 .fd-page-tree-item-name {
   display: flex;
   align-items: center;
   gap: 0.5rem;
   font-size: 0.8125rem; /* sidebar item text 1px smaller (14px → 13px) */
 }
 .marfa-api-method {
-  display: inline-block;
+  display: inline-flex;
+  height: 1.125rem;
   flex: none;
+  align-items: center;
+  justify-content: center;
+  padding-inline: 0.25rem;
+  border: 1px solid color-mix(in oklab, currentColor 22%, transparent);
+  border-radius: 0.3rem;
+  background: color-mix(in oklab, currentColor 9%, transparent);
+}
+.marfa-api-method-icon {
+  display: none;
+  width: 0.75rem;
+  height: 0.75rem;
+  flex: 0 0 0.75rem;
+  align-items: center;
+  justify-content: center;
+}
+.marfa-api-method-label {
   font-size: 0.625rem;
   font-weight: 600;
-  line-height: 1.125rem;
+  line-height: 1;
   letter-spacing: 0.01em;
 }
+.marfa-api-method-icon > svg {
+  width: 0.75rem;
+  height: 0.75rem;
+  stroke-width: 1.8;
+}
 .marfa-api-method--get {
   color: var(--color-green-600);
 }
@@ -272,15 +295,32 @@
   color: var(--color-violet-400);
 }
 
-/* Operation names can wrap in the narrow sidebar, so the label stays at the
-   first line and has one width for every method. */
+/* Operation names can wrap in the narrow sidebar, so the method there is the
+   icon alone, kept square at the first line. */
 #nd-sidebar .fd-page-tree-item-name,
 #nd-sidebar-mobile .fd-page-tree-item-name {
   align-items: flex-start;
 }
 #nd-sidebar .marfa-api-method,
 #nd-sidebar-mobile .marfa-api-method {
-  width: 3.5rem;
+  width: 1.125rem;
+  padding-inline: 0;
+}
+#nd-sidebar .marfa-api-method-icon,
+#nd-sidebar-mobile .marfa-api-method-icon {
+  display: inline-flex;
+}
+#nd-sidebar .marfa-api-method-label,
+#nd-sidebar-mobile .marfa-api-method-label {
+  position: absolute;
+  width: 1px;
+  height: 1px;
+  padding: 0;
+  margin: -1px;
+  overflow: hidden;
+  clip: rect(0, 0, 0, 0);
+  white-space: nowrap;
+  border: 0;
 }
 
 /* Sidebar groups and selected-row fills already communicate hierarchy and