Custom Avatar Parameters, bug fixes, ui improvements

[LucHeart]

Summary

• Fix per-group cooldown override: OscHandler.SendParams() was hardcoded to use the global cooldown time, ignoring group-level OverrideCooldownTime/CooldownTime overrides — the _Cooldown, _CooldownPercentage, and _Intensity feedback parameters sent to VRChat were wrong for any group with a custom cooldown
• Avatar Parameter Actions: New system for mapping arbitrary avatar parameters to shocker actions, configurable per-avatar from a new UI tab. Supports one-shot triggers (OnTrue, OnFalse, Threshold, OnChange) and live continuous control driven by parameter value with configurable input range
• Game connection indicator: Debug tab shows a color-coded chip with connection status and whether it's via OSCQuery or manual config
• Replace Task.Delay loops with CancellationToken + PeriodicTimer: Background loops (ReceiverLoop, SenderLoop, CheckLoop) now shut down deterministically via cancellation instead of a 1-second sleep hack
• UI improvements: Timing settings (cooldown, hold time) converted from raw text fields to sliders with numeric input for custom values; check loop interval exposed as an advanced setting; group cooldown override label now shows "(ms)" unit

Test plan

• Set a per-group cooldown override, verify the _Cooldown and _CooldownPercentage avatar parameters in VRChat match the group's cooldown, not the global one
• Configure an avatar parameter action with each trigger kind (OnTrue, OnFalse, Threshold, OnChange) and verify they fire correctly
• Configure a live control action, verify continuous intensity tracks the parameter value and stops when it reaches 0
• Test live control with non-standard ranges (e.g. -1 to 1 radial, 0-7 int) and verify correct intensity mapping
• Verify the connection chip in the Debug tab updates on connect/disconnect
• Change the check loop interval in Advanced settings, reconnect, and verify responsiveness changes
• Verify the cooldown/hold time sliders work and that typing a value beyond the slider range is accepted

[chatgpt-codex-connector]

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