Provides a clean loading experience during system operations:

    Bootstrap Splash Screen:
    - Displays IMMEDIATELY when HTML loads (before JS/CSS bundles)
    - Eliminates the "white screen" during initial load
    - Shows animated progress with rotating status messages
    - Auto-hides when Odoo WebClient is ready

    System Overlay:
    - Shows during module upgrades
    - Shows during asset bundle recompilation
    - Broadcasts via bus service for real-time updates

    BlockUI Integration (v1.4.0):
    - Patches Odoo's native BlockUI component
    - All ui.block() / ui.unblock() calls show SAM overlay
    - Consistent branding across reports, navigation, RPC
    - Message rotation for long-running operations