v1.2.0 — Video End Card & Ready Callbacks

Added

• VideoEndCard overlay displayed when the video completes — shows the last visible frame, a Replay button, and a Visit Site button (only when a click-through URL is present); re-appears automatically after replay finishes
• onVideoReady callback on AddStreamVideoWidget — fires once the first video frame is rendered on screen, distinct from onAdLoaded which fires after initialization
• onImageLoaded callback on AddStreamWidget — fires when the ad image pixels are fully decoded and painted on screen

Fixed

• Pause and resume IAB tracking events are now deduplicated with a markEventFired guard to prevent double-firing