Add controller rumble from GFN input channel

[zortos293]

Summary

• Extend reliable input channel message handling to dispatch post-handshake messages through new haptics parsers instead of ignoring them
• Add official GFN-compatible parsing for legacy haptic packets and v3+ sub-message wrappers that rumble commands
• Apply rumble through browser Gamepad API using dual-rumble actuators with official 0-65535 magnitude scaling
• Track per-controller rumble state/timestamps and throttle nonzero effects to 500ms while allowing stop commands immediately
• Stop active rumble and clear state on gamepad disconnect, input capture detach, and peer cleanup
• Add rate-limited diagnostics for haptics support and malformed/unknown haptic messages

[zortos293]

Needs testin