Improvements for Redux

[officialMECH]

This PR consists of maintenance updates to the Redux store in order to address circular dependency issues and improve some jank implementation details.

General Changes

• The "Processing Delay" field has been removed in favor of reading the explicit latency from the shared Audio Context, which should provide more reliable sync for playback without needing to guess the necessary offset manually.

Technical Changes

• All features (actions and reducers) no longer import cross-site actions or selectors for extra reducer effects, which should allow these features to be more easily decoupled and isolated for testing environments.
• App-level singletons have been refactored to a more streamlined API surface in order to decouple them from the store internals.
• All middleware and thunks can now directly access singleton instances via extra arguments.
  • New selectors have also been added to access route-level params and context for editor-specific effects.
• redux-undo was dropped in favor of history-adapter, which allows for a more composable history implementation without needing to import cross-site action types for filtering.
• The entity adapters for each view are now consolidated into a single slice definition, which was necessary for incorporating history updates across all scoped entities.
• The storage middleware have been rewritten as a set of strategy-based enhancers, which should make it more viable to sync the storage layer without importing or depending on a manual hydration action for each observer.
• Real time calculations have been normalized to seconds for better consistency across the app and upstream services.

Bugfixes

• All actions that jump the cursor position will now always keep the cursor aligned to the current snap precision.