Emote animation redesigned:
- showReceived() now accepts 'fromElement' parameter
- Emote starts at sender's panel position (scaled small)
- Pops up to full size at origin (0.2s)
- Flies to center of game board (0.5s)
- Grows large and fades out at center (1.8s total)
- Uses Web Animations API for smooth 60fps path

Chess:
- YOUR emotes start from your player bar (bottom)
- Opponent emotes start from their bar (top)

Ludo:
- YOUR emotes start from your panel (pp-{myPlayerIndex})
- Opponent emotes start from their panel (pp-{senderIdx})

Both games now have directional emote animation — you can SEE
who sent what because it originates from their side of the screen.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>