feat: show fronters on replied to

src/entrypoints/background.ts

···
                     },
                     ...fronter,
                   };
+                } else if (uri === item.post.uri) {
+                  fronter = {
+                    replyTo: item.reply?.parent.uri,
+                    ...fronter,
+                  };
                 }
                 const parsedUri = await cacheFronter(uri, fronter);
                 return {

src/entrypoints/content.ts

···
+import { expect } from "@/lib/result";
 import { FronterView, parseSocialAppPostUrl } from "@/lib/utils";
+import { parseResourceUri } from "@atcute/lexicons";
 
 const getAuthHeader = (headers: any): string | null => {
   if (headers instanceof Headers) {
···
                 displayNameElement,
               );
               return;
+            }
+            if (fronter.type === "post" && fronter.replyTo) {
+              const parsedReplyUri = expect(parseResourceUri(fronter.replyTo));
+              const replyFronter = fronters.get(
+                `/profile/${parsedReplyUri.repo}/post/${parsedReplyUri.rkey}`,
+              );
+              if (replyFronter && replyFronter.members?.length > 0) {
+                const replyDisplayNameElement =
+                  el.parentElement?.parentElement?.parentElement
+                    ?.firstElementChild?.nextElementSibling?.firstElementChild
+                    ?.nextElementSibling?.firstElementChild?.firstElementChild
+                    ?.firstElementChild?.firstElementChild ?? null;
+                if (replyDisplayNameElement) {
+                  applyFronterName(
+                    replyDisplayNameElement,
+                    replyFronter.members,
+                  );
+                }
+              }
             }
           }
         }

src/lib/utils.ts

···
   handle: Handle | null;
   did: AtprotoDid;
   subject?: Subject;
+  replyTo?: ResourceUri;
 };
 
 export type FronterView = Fronter & { rkey: RecordKey } & (