fix: handle expired DA token without raw IPC errors

[davidnuescheler]

Summary

• When da.live / api.aem.live returns 401, clear the stored IMS token and emit da:session-expired to the renderer
• Renderer refreshes auth state and returns to home instead of showing raw IPC errors like Error invoking remote method 'da:list': Unauthorized: invalid or expired token
• Sync, push, and document view error dialogs skip the modal when the failure is an auth expiry

Test plan

• Sign in, browse a site, then manually invalidate the token file (or wait for expiry) and expand the file tree — app should sign out cleanly, not throw an IPC error
• After session expiry during browse, confirm Sign in works and the tree loads again
• Trigger sync/push with an expired token — no error dialog; user is returned to signed-out state
• npm run lint && npm test pass locally

Made with Cursor

[trieloff]

🎉 This PR is included in version 1.6.1 🎉

The release is available on GitHub release

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