[TASK] Normalize native event payloads across iOS and Android

[Jmilham21]

Several native events have inconsistent payloads between iOS and Android, or are missing TypeScript type definitions. This umbrella issue tracks the work to normalize them.

Property mismatches (both platforms fire the event, but payloads differ)

Event	Issue
onRateChanged	Android missing at (time position when rate changed)
onPlayerError	iOS missing description
onPlayerAdError	iOS sends only error; Android sends code, adErrorCode, error
onPlayerAdWarning	iOS missing adErrorCode; sends warning + code
onAdEvent	Android sends reason on adPause/adPlay; iOS does not
onCasting	Android sends device/active/available; iOS sends empty dict
onCaptionsList	Android tracks include file; iOS tracks do not

Events only one platform fires

Event	Fires on	Missing from
onPlaylist	iOS	Android (no-op handler)
onPlayerWarning	iOS	Android
onIdle	iOS	Android (no-op handler)
onVisible	iOS only	Android
onAttemptPlay	iOS only	Android
onUpdateBuffer	iOS only	Android
onScreenTapped	iOS only	Android
onPlayerSizeChange	iOS only	Android
8 Cast-specific events	iOS (granular)	Android (uses single onCasting)

TypeScript type issues

Issue	Details
PlaylistItemEventProps missing index	Both platforms send it for onPlaylistItem and onBeforeNextPlaylistItem
CaptionsListEventProps is flat, not array	Both platforms send tracks as an array, TS type has flat label/default/file
Multiple iOS-only events not in TS types	onVisible, onAttemptPlay, onUpdateBuffer, onScreenTapped, onPlayerSizeChange, plus cast events
onCasting not in TS types	Both platforms fire it but with different payloads
onIdle not in TS types	iOS fires it; Android has empty handler

Already fixed

• onSeeked — iOS was missing position ([BUG][iOS][Android] inconsistent nativeEvent property [onSeeked] #223, fixed in fix: normalize iOS seek event properties to match Android and TS types #224)
• onSeek — iOS was sending from/to instead of position/offset (fixed in fix: normalize iOS seek event properties to match Android and TS types #224)

[Jmilham21]

This is about half done with 1.5.0 and will be picked back up for next release.