feat: profile bio

components/social/mention-text.tsx

@@ -0,0 +1,56 @@
+"use client";
+
+/**
+ * MentionText — renders user-authored plain text with `@handle` tokens turned
+ * into profile links.
+ *
+ * The single place that decides what a mention looks like. Shared by comment
+ * bodies and profile bios so the two can't drift apart, and so the
+ * "@handle" grammar lives next to the regex the composer
+ * (`MentionTextarea`) uses to detect it.
+ *
+ * Input is always PLAIN TEXT, never HTML — we split on the token and emit
+ * React nodes, so nothing user-supplied is ever interpreted as markup.
+ * `whitespace-pre-line` on the wrapper preserves the author's line breaks
+ * (bios are multi-line) without needing <br> injection.
+ */
+
+import Link from "next/link";
+import { cn } from "@/lib/utils";
+
+/** Capturing group keeps the delimiters, so split() yields text and tokens
+ *  alternately. Handle charset matches MentionTextarea's MENTION_RE. */
+const MENTION_TOKEN = /(@[A-Za-z0-9_]+)/g;
+
+/** Split text into plain runs + clickable @handle links. Exported for callers
+ *  that need the nodes without the wrapper element. */
+export function renderMentions(text: string) {
+  return text.split(MENTION_TOKEN).map((part, i) => {
+    if (part.length > 1 && part[0] === "@") {
+      return (
+        <Link
+          key={i}
+          href={`/u/${part.slice(1)}`}
+          className="font-medium text-primary hover:underline"
+        >
+          {part}
+        </Link>
+      );
+    }
+    return part;
+  });
+}
+
+export function MentionText({
+  text,
+  className,
+}: {
+  text: string;
+  className?: string;
+}) {
+  return (
+    <span className={cn("whitespace-pre-line", className)}>
+      {renderMentions(text)}
+    </span>
+  );
+}