fix: update createFollow function to remove followerDid parameter

src/api/mod.ts

···
     "/xrpc/social.grain.graph.createFollow",
     ["POST"],
     async (req, _params, ctx) => {
-      const { did } = ctx.requireAuth();
+      ctx.requireAuth();
       const { subject } = await parseCreateFollowInputs(req);
       if (!subject) {
         throw new XRPCError("InvalidRequest", "Missing subject input");
       }
       try {
-        const followUri = await createFollow(did, subject, ctx);
+        const followUri = await createFollow(subject, ctx);
         return ctx.json({ followUri } satisfies CreateFollowOutputSchema);
       } catch (error) {
         console.error("Error creating follow:", error);

src/lib/graph.ts

···
 }
 
 export async function createFollow(
-  followerDid: string,
   followeeDid: string,
   ctx: BffContext,
 ): Promise<string> {
   const followUri = await ctx.createRecord<GrainFollow>(
     "social.grain.graph.follow",
     {
-      did: followerDid,
       subject: followeeDid,
       createdAt: new Date().toISOString(),
     },