fix(app): restore desktop prod legacy flows (#28919)

packages/app/src/pages/session/new-session-layout.test.ts

@@ -0,0 +1,14 @@
+import { describe, expect, test } from "bun:test"
+import { shouldUseV2NewSessionPage } from "./new-session-layout"
+
+describe("shouldUseV2NewSessionPage", () => {
+  test("keeps prod session pages on the legacy layout", () => {
+    expect(shouldUseV2NewSessionPage({ channel: "prod", sessionID: "ses_123" })).toBe(false)
+    expect(shouldUseV2NewSessionPage({ channel: "prod" })).toBe(false)
+  })
+
+  test("uses the v2 layout only for non-prod new-session pages", () => {
+    expect(shouldUseV2NewSessionPage({ channel: "dev" })).toBe(true)
+    expect(shouldUseV2NewSessionPage({ channel: "dev", sessionID: "ses_123" })).toBe(false)
+  })
+})

packages/app/src/pages/session/new-session-layout.ts

@@ -0,0 +1,3 @@
+export function shouldUseV2NewSessionPage(input: { channel?: "dev" | "beta" | "prod"; sessionID?: string }) {
+  return input.channel !== "prod" && !input.sessionID
+}