v0.8.0

• Add a global Sidebar on startup setting that is saved to user configuration while preserving session-scoped Sidebar on/off controls.
• Harden Atelier lifecycle teardown for session-owned overlays, exception-safe cleanup, stale Sidebar snapshots, candidate startup failures, and deferred Display saves.
• Simplify Sidebar context rendering, contributed-panel validation, and Sidebar undo bookkeeping without changing behavior.