feat(you): show username card for auto-assigned handles

Flipcash/Core/Screens/Main/Username/UsernameGate.swift

@@ -80,3 +80,10 @@ func usernameGate(session: some UsernameBalanceReading, minimum: TokenAmount?) -
     }
     return .proceed
 }
+
+/// Whether to offer the custom-username card: true unless the user holds a
+/// handle they chose themselves. A server-assigned handle still counts as
+/// unclaimed.
+func usernameNeedsClaim(username: Username?, isAutoAssigned: Bool) -> Bool {
+    username == nil || isAutoAssigned
+}

Flipcash/Core/Screens/Main/You/YouScreen.swift

@@ -506,10 +506,16 @@ struct YouScreen: View {
 
     private var username: Username? { profile?.username }
 
-    /// Whether to offer the handle. Derived from the handle being absent rather
-    /// than from a separate claimed flag, so a handle that disappears across a
-    /// profile refresh puts the offer back on its own.
-    private var shouldPromptForUsername: Bool { username == nil }
+    /// Whether to offer the handle: the user has none, or the one they have was
+    /// auto-assigned by the server and they haven't picked their own. Re-derived
+    /// from the profile on every render, so a handle that disappears across a
+    /// refresh puts the offer back on its own.
+    private var shouldPromptForUsername: Bool {
+        usernameNeedsClaim(
+            username: username,
+            isAutoAssigned: profile?.isUsernameAutoAssigned == true
+        )
+    }
 
     private var codeData: Data {
         TipCode.Payload(userID: sessionContainer.session.userID).codeData()

FlipcashTests/UsernameGateTests.swift

@@ -96,4 +96,21 @@ struct UsernameGateTests {
 
         #expect(usernameGate(session: session, minimum: minimum(usd: 100)) == .proceed)
     }
+
+    @Test("A user with no handle is offered the username card")
+    func prompt_noHandle_prompts() {
+        #expect(usernameNeedsClaim(username: nil, isAutoAssigned: false))
+    }
+
+    @Test("A server-assigned handle still gets the username card")
+    func prompt_autoAssignedHandle_prompts() {
+        let assigned = Username("brandon4821")!
+        #expect(usernameNeedsClaim(username: assigned, isAutoAssigned: true))
+    }
+
+    @Test("A handle the user chose does not get the username card")
+    func prompt_customHandle_doesNotPrompt() {
+        let custom = Username("brandon")!
+        #expect(!usernameNeedsClaim(username: custom, isAutoAssigned: false))
+    }
 }