feat(app): allow toggling tabs layout (#29526)

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

@@ -2,13 +2,13 @@ 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("keeps disabled pages on the legacy layout", () => {
+    expect(shouldUseV2NewSessionPage({ newLayoutDesigns: false, sessionID: "ses_123" })).toBe(false)
+    expect(shouldUseV2NewSessionPage({ newLayoutDesigns: false })).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)
+  test("uses the v2 layout only for enabled new-session pages", () => {
+    expect(shouldUseV2NewSessionPage({ newLayoutDesigns: true })).toBe(true)
+    expect(shouldUseV2NewSessionPage({ newLayoutDesigns: true, sessionID: "ses_123" })).toBe(false)
   })
 })

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

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

packages/app/src/pages/session/session-side-panel.tsx

@@ -28,8 +28,6 @@ import { createOpenSessionFileTab, createSessionTabs, getTabReorderIndex, type S
 import { setSessionHandoff } from "@/pages/session/handoff"
 import { useSessionLayout } from "@/pages/session/session-layout"
 
-const USE_DESKTOP_V2 = import.meta.env.VITE_OPENCODE_CHANNEL !== "prod"
-
 type RenderDiff = (SnapshotFileDiff & { file: string }) | VcsFileDiff
 
 function renderDiff(value: SnapshotFileDiff | VcsFileDiff): value is RenderDiff {
@@ -60,7 +58,7 @@ export function SessionSidePanel(props: {
   const { sessionKey, tabs, view, params } = useSessionLayout()
 
   const isDesktop = createMediaQuery("(min-width: 768px)")
-  const desktopV2 = () => platform.platform === "desktop" && USE_DESKTOP_V2
+  const desktopV2 = () => platform.platform === "desktop" && settings.general.newLayoutDesigns()
   const shown = createMemo(() => (desktopV2() ? settings.general.showFileTree() : true))
 
   const reviewOpen = createMemo(() => isDesktop() && view().reviewPanel.opened())
@@ -205,7 +203,7 @@ export function SessionSidePanel(props: {
   })
 
   return (
-    <Show when={isDesktop() && !(import.meta.env.VITE_OPENCODE_CHANNEL !== "prod" && !params.id)}>
+    <Show when={isDesktop() && !(settings.general.newLayoutDesigns() && !params.id)}>
       <aside
         id="review-panel"
         aria-label={language.t("session.panel.reviewAndFiles")}

packages/app/src/pages/session/use-session-commands.tsx

@@ -20,8 +20,6 @@ import { extractPromptFromParts } from "@/utils/prompt"
 import { UserMessage } from "@opencode-ai/sdk/v2"
 import { useSessionLayout } from "@/pages/session/session-layout"
 
-const USE_DESKTOP_V2 = import.meta.env.VITE_OPENCODE_CHANNEL !== "prod"
-
 export type SessionCommandContext = {
   navigateMessageByOffset: (offset: number) => void
   setActiveMessage: (message: UserMessage | undefined) => void
@@ -72,7 +70,7 @@ export const useSessionCommands = (actions: SessionCommandContext) => {
   })
   const activeFileTab = tabState.activeFileTab
   const closableTab = tabState.closableTab
-  const desktopV2 = () => platform.platform === "desktop" && USE_DESKTOP_V2
+  const desktopV2 = () => platform.platform === "desktop" && settings.general.newLayoutDesigns()
   const shown = () => (desktopV2() ? settings.general.showFileTree() : true)
 
   const messages = () => {