Peripheral volume display (#411)

Adds the volume display effect to these boards that have LED Ring, when controlling the volume for LVA:

- Satellite 1 HAT Board

- ReSpeaker 4-Mic Array HAT

- ReSpeaker USB Mic Array v2.0

This animation appears on the LED ring temporarily to display an arc that sweeps clockwise when the volume increases and anti-clockwise when the volume decreases. Triggers by the volume_changed event.

examples/ReSpeaker Mic Array v2.0 (USB)/DOCS.md

@@ -36,6 +36,7 @@ All animations mirror the Home Assistant Voice PE ESPHome firmware exactly.
 | Error | Red pulse | All LEDs red, pulsing |
 | Timer ticking | Countdown arc | Arc proportional to `seconds_left / total_seconds` |
 | Timer ringing | Pulse + optional red | Full ring pulsing; red at mic positions if muted |
+| Volume changed | Volume Display arc | Temporary arc (2.5s) showing the current volume level, starting from LED 9 (bottom, between the micro-USB and AUX jack) and sweeping clockwise |
 | Volume muted  | Red mic indicator | LED 9 (bottom at the AUX jack corner) solid red to indicate the media player volume is zero; other LEDs off |
 
 "User color" comes from the Home Assistant Light entity described below (default: HAVPE-style blue). HA brightness scales every animation in this table. Semantic colors (Waiting/Listening cyan spin, Thinking pulse, Replying anticlockwise, Muted solid + red, Timer pulse/arc, Error red pulse) are hardcoded so they remain recognisable across user customisation.
@@ -218,4 +219,4 @@ The script automatically attempts to re-find the device after a USB error (e.g.
 
 1. Confirm LVA is running and port 6055 is open: `nc -zv localhost 6055`.
 2. With `network_mode: host`, `localhost` resolves to the host itself regardless of where the LVA container runs.
-3. If LVA is on a different machine, use its IP address as `--host`.
+3. If LVA is on a different machine, use its IP address as `--host`.