fix(desktop): reuse profiles when joining communities

desktop/src/features/onboarding/ui/CommunityOnboardingFlow.tsx

@@ -19,7 +19,7 @@ import {
   parseEmojiAvatarDataUrl,
   ProfileAvatarEditor,
 } from "@/features/profile/ui/ProfileAvatarEditor";
-import { updateProfile } from "@/shared/api/tauriProfiles";
+import { getProfile, updateProfile } from "@/shared/api/tauriProfiles";
 import { getIdentity, importIdentity } from "@/shared/api/tauriIdentity";
 import { listPersonas } from "@/shared/api/tauriPersonas";
 import { relayClient } from "@/shared/api/relayClient";
@@ -151,6 +151,7 @@ export function CommunityOnboardingFlow({
     [],
   );
   const [isPending, setIsPending] = React.useState(false);
+  const checkedProfileTransactionRef = React.useRef<string | null>(null);
   const [starterChannelFailureCount, setStarterChannelFailureCount] =
     React.useState(0);
   const [deniedPubkey, setDeniedPubkey] = React.useState("");
@@ -274,6 +275,22 @@ export function CommunityOnboardingFlow({
   }, [isPending, update]);
 
   const isProfileStage = transaction?.stage === "profile";
+  React.useEffect(() => {
+    if (!isProfileStage || !transaction) return;
+    if (checkedProfileTransactionRef.current === transaction.id) return;
+
+    checkedProfileTransactionRef.current = transaction.id;
+    void getProfile()
+      .then((profile) => {
+        if (profile.hasProfileEvent) {
+          update({ stage: "team-intro", error: undefined }, transaction.id);
+        }
+      })
+      .catch(() => {
+        // Discovery is best-effort. Staying on the profile step preserves the
+        // existing path when the relay cannot answer the lookup.
+      });
+  }, [isProfileStage, transaction, update]);
   const isTeamStage =
     transaction?.stage === "team-intro" ||
     transaction?.stage === "finalizing" ||

desktop/src/testing/e2eBridge.ts

@@ -216,6 +216,8 @@ type E2eConfig = {
     channelWindowDelayMs?: number;
     profileReadDelayMs?: number;
     profileReadError?: string;
+    /** Override whether get_profile reports a real kind:0 event. */
+    profileHasEvent?: boolean;
     profileUpdateError?: string;
     profileUpdateErrors?: string[];
     searchProfiles?: MockSearchProfileSeed[];
@@ -5088,6 +5090,13 @@ async function handleGetChannels(config: E2eConfig | undefined) {
 
 async function handleGetProfile(config: E2eConfig | undefined) {
   const identity = getIdentity(config);
+  const forcedHasProfileEvent = config?.mock?.profileHasEvent;
+  if (forcedHasProfileEvent !== undefined) {
+    return {
+      ...cloneProfile(ensureMockProfile(config)),
+      has_profile_event: forcedHasProfileEvent,
+    };
+  }
   if (!identity) {
     const profileReadDelayMs = config?.mock?.profileReadDelayMs ?? 0;
     if (profileReadDelayMs > 0) {

desktop/tests/e2e/onboarding.spec.ts

@@ -1170,6 +1170,66 @@ test("first-community direct join reaches profile", async ({ page }) => {
     .toEqual({ communityCount: 1, transactionMatchesOnlyCommunity: true });
 });
 
+test("community onboarding reuses an existing relay profile", async ({
+  page,
+}) => {
+  await seedActiveIdentity(page, BLANK_TYLER_IDENTITY);
+  await page.addInitScript(
+    ({ pubkey, transactionStorageKey }) => {
+      window.localStorage.setItem(
+        `buzz-machine-onboarding-complete.v2:${pubkey}`,
+        "true",
+      );
+      const timestamp = new Date().toISOString();
+      window.localStorage.setItem(
+        transactionStorageKey,
+        JSON.stringify({
+          id: "txn-existing-profile",
+          source: "add-community",
+          stage: "profile",
+          relayUrl: "wss://onboarding.communities.buzz.xyz",
+          communityName: "Onboarding",
+          communityId: "e2e-default-community",
+          createdAt: timestamp,
+          updatedAt: timestamp,
+        }),
+      );
+    },
+    {
+      pubkey: BLANK_TYLER_IDENTITY.pubkey,
+      transactionStorageKey: COMMUNITY_ONBOARDING_TRANSACTION_STORAGE_KEY,
+    },
+  );
+  await installMockBridge(
+    page,
+    { profileHasEvent: true },
+    {
+      relayWsUrl: "wss://onboarding.communities.buzz.xyz",
+      skipOnboardingSeed: true,
+    },
+  );
+  await page.goto("/");
+
+  await expect
+    .poll(() =>
+      page.evaluate(
+        () =>
+          (
+            window as Window & { __BUZZ_E2E_COMMANDS__?: string[] }
+          ).__BUZZ_E2E_COMMANDS__?.filter(
+            (command) => command === "get_profile",
+          ).length ?? 0,
+      ),
+    )
+    .toBeGreaterThan(0);
+  await expect(
+    page.getByRole("heading", { name: "Meet your starter team" }),
+  ).toBeVisible();
+  await expect(
+    page.getByRole("heading", { name: "Build your profile" }),
+  ).toHaveCount(0);
+});
+
 test("first-community direct join cancel returns to request access", async ({
   page,
 }) => {

desktop/tests/helpers/bridge.ts

@@ -225,6 +225,8 @@ type MockBridgeOptions = {
   channelWindowDelayMs?: number;
   profileReadDelayMs?: number;
   profileReadError?: string;
+  /** Override whether get_profile reports a real kind:0 event. */
+  profileHasEvent?: boolean;
   profileUpdateError?: string;
   profileUpdateErrors?: string[];
   searchProfiles?: MockSearchProfileSeed[];