feat(frontend): Server Actions for thought, social, and profile mutations

thoughts-frontend/app/actions/social.ts

@@ -0,0 +1,28 @@
+"use server";
+
+import { revalidateTag } from "next/cache";
+import { cookies } from "next/headers";
+import {
+  followUser as apiFollowUser,
+  unfollowUser as apiUnfollowUser,
+} from "@/lib/api";
+
+async function getToken(): Promise<string> {
+  const token = (await cookies()).get("auth_token")?.value;
+  if (!token) throw new Error("Not authenticated");
+  return token;
+}
+
+export async function followUser(username: string) {
+  const token = await getToken();
+  await apiFollowUser(username, token);
+  revalidateTag(`profile:${username}`);
+  revalidateTag("feed");
+}
+
+export async function unfollowUser(username: string) {
+  const token = await getToken();
+  await apiUnfollowUser(username, token);
+  revalidateTag(`profile:${username}`);
+  revalidateTag("feed");
+}