feat(sia-video-source): add feature preset

[pcfreak30]

Adds siaFeatures, a mutable tuple containing recovery and load features.

It can be passed to combine(...) or createPlayer(...) and spread into videoFeatures.

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Summary

This PR adds a shared feature preset to libs/sia-video-source: a single siaFeatures tuple that combines the two existing Sia player features (siaRecoveryFeature and siaLoadFeature) so consumers can wire both features into a Video.js player in one step — whether they use the non-React store API or React createPlayer.

What’s changed

• New sia-features.ts module

  • Exports SiaFeatures, an explicitly typed mutable tuple [PlayerFeature<SiaRecoveryState>, PlayerFeature<SiaLoadState>].
  • Exports siaFeatures, the shared tuple (recovery first, then load).
  • The tuple is deliberately not as const: React createPlayer requires mutable feature arrays, while combine(...) accepts either.

• Root package export

  • siaFeatures and SiaFeatures are re-exported from the package root, mirroring how videoFeatures is shipped by the video.js stack.

• Works with both consumption APIs

  • Non-React: createStore()(combine(...siaFeatures)) assembles a store containing both slices.
  • React: createPlayer({ features: siaFeatures }) (or a composition like [...videoFeatures, ...siaFeatures]) drives both existing hooks (useSiaRecovery / useSiaLoad) from the same player store.

• Documentation

  • README section added with usage examples for both vanilla Video.js and React consumers, plus a note explaining why the tuple must stay mutable.

Tests

• Store-level spec — verifies combine(...siaFeatures) seeds both slices inert, updates each slice only on its own event, and resets both on detach.
• React binding spec — mounts a real @videojs/react <Player> built with features: siaFeatures and proves both hooks read/update the same store.
• Declaration/type guard spec — ensures:
  • Root declarations never reference @videojs/react (non-React consumers can import siaFeatures without React installed).
  • A non-React consumer compiles with @videojs/react deliberately unresolvable.
  • React createPlayer accepts the tuple and [...videoFeatures, ...siaFeatures].
  • A readonly as const tuple correctly fails TS2769, protecting the mutable-tuple requirement.

The result is a single, pre-composed features preset for the Sia video source that removes the need to assemble the two features separately across vanilla and React consumers.

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