refactor(store): simplify controller and state APIs

[mihar-22]

Summary

Simplifies the store package APIs by creating a shared SubscriptionController base for Lit controllers and removing unused utilities.

Changes

• Create SubscriptionController as shared base that handles store resolution (direct or context) and subscription lifecycle
• QueueController and StoreController are now thin wrappers that configure what to subscribe to
• SubscriptionController implements ReactiveController and registers itself with the host
• Simplify StateChange callback signature — no longer passes changedKeys to callbacks (internal tracking preserved)
• Add useMemo to React hooks for stable object references
• Remove unused extendConfig utility and tests

Implementation details

Controller hierarchy:

SubscriptionController       ← handles context + subscription lifecycle
├── StoreController          ← subscribes to store state
└── QueueController          ← subscribes to queue tasks

SnapshotController           ← self-contained (State<T> directly)

Test improvements:

• Replaced mock host with TestHostElement extends ReactiveElement
• Tests use real DOM lifecycle (appendChild/remove) instead of simulating hostConnected/hostDisconnected

Testing

pnpm -F @videojs/store test — 238 tests pass

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1 Skipped Deployment

Project	Deployment	Review	Updated (UTC)
vjs-10-website	Skipped		Jan 28, 2026 1:08pm