feat(desktop): add layout transition switch (#36667)

Co-authored-by: Brendan Allan <git@brendonovich.dev>

packages/desktop/src/main/index.ts

@@ -19,7 +19,12 @@ import { forwardInitializationFailure } from "./initialization"
 import { exportDebugLogs, initCrashReporter, initLogging, startNetLog, write as writeLog } from "./logging"
 import { parseMarkdown } from "./markdown"
 import { createMenu } from "./menu"
-import { finishFirstLaunchOnboarding, isFirstLaunchOnboardingPending } from "./onboarding"
+import {
+  finishFirstLaunchOnboarding,
+  initializeOldLayoutEligibility,
+  isFirstLaunchOnboardingPending,
+  isOldLayoutEligible,
+} from "./onboarding"
 import {
   getDefaultServerUrl,
   preferAppEnv,
@@ -137,6 +142,7 @@ const main = Effect.gen(function* () {
     onboardingTestRoot ? join(onboardingTestRoot, "desktop") : join(app.getPath("appData"), appId),
   )
   if (onboardingTestRoot) app.setPath("sessionData", join(onboardingTestRoot, "session"))
+  initializeOldLayoutEligibility(app.getPath("userData"))
   logger = initLogging()
   initCrashReporter()
 
@@ -280,6 +286,7 @@ const main = Effect.gen(function* () {
     setDefaultServerUrl: (url) => setDefaultServerUrl(url),
     isFirstLaunchOnboardingPending,
     finishFirstLaunchOnboarding,
+    isOldLayoutEligible,
     getDisplayBackend: async () => null,
     setDisplayBackend: async () => undefined,
     parseMarkdown: async (markdown) => parseMarkdown(markdown),