feat(FN-3434): add Claude OAuth credential interop with verification and st

This merge lands four major features: the desktop app gains shell onboarding with remote mode support via a new `DesktopModeChooser` and `shell-settings` module (FN-3399); the dashboard gains full archived insights support with the `InsightsView` redesign and `useInsights` hook overhaul (FN-3315); C

Fusion-Task-Id: FN-3434

packages/engine/src/auth-storage.ts

@@ -3,6 +3,7 @@ import { homedir } from "node:os";
 import { join } from "node:path";
 import {
   choosePreferredStoredCredential,
+  getClaudeCodeCredentialPaths,
   getCodexCliAuthPath,
   readStoredCredentialsFromAuthFile,
   shouldHydrateStoredCredential,
@@ -38,6 +39,7 @@ function getSupplementalAuthPaths(home = getHomeDir()): string[] {
   return [
     ...getLegacyAuthPaths(home),
     getCodexCliAuthPath(home),
+    ...getClaudeCodeCredentialPaths(home),
   ];
 }