Add Silo auth dock widget, update silo submodule
Wire up the new Silo authentication dock panel in InitGui.py: - _setup_silo_auth_panel() creates the Database Auth dock widget - Tabified with the existing Database Activity panel on the right dock - Deferred to 4500ms to ensure activity panel exists first - Widget reference pinned on the dock panel to prevent GC Update silo submodule to include auth widget, login flow, token management, enhanced settings dialog, and silo-auth.svg icon.
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