v0.23.0

What's Changed

Added desktop-local action authentication with snapshot fallback for improved offline reliability during sign-in and session recovery.
Cleared session cookies reliably on desktop sign-out and anonymous account deletion, improving privacy and security.
Refined the desktop auth finalize page flow for smoother email verification completion.

Showed the app UI only after Next.js finishes loading, eliminating flash-of-unstyled-content and improving perceived startup performance.
Made the desktop window title bar transparent and draggable (later reverted to default for consistency).
Improved Electron theme backgrounds and dialog focus handling for better visual polish and accessibility.
Refined Electron startup logic and DMG packaging configuration, including centered DMG layout and a switch to gray background for installer visuals.

Updated Electron Builder configuration and related scripts to support refined packaging and theme behavior.
Consolidated and cleaned up desktop-specific auth context and action definitions across server and client layers.

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