TCP: Handle chord/tap-dance resolution events

[malpern]

Problem

Kanata TCP protocol sends ChordResolved and TapDanceResolved events but KeyPath doesn't handle them. This is tracked as MAL-10 for keyberon emission points.

Currently Handled

• LayerChange
• ConfigFileReload
• Ready
• ConfigError
• MessagePush

Not Handled

• Sequence timeout events
• One-shot state changes
• ChordResolved (MAL-10)
• TapDanceResolved (MAL-10)

Impact

Overlay shows synthetic outputs for chords/tap-dance (visual noise).

References

• MAL-10 (keyberon emission points)
• Comprehensive review: docs/code-review/comprehensive-feature-review.md section 4
• MAL-18 (overlay suppression)