Fix Arctis Nova 7 battery level misreporting.

[ashirkov-c-arlo]

Changes made

Fixes battery level misreporting on SteelSeries Arctis Nova 7 headsets by replacing heuristic-based battery protocol detection with deterministic product-ID-based detection.

The Arctis Nova 7 family has two battery reporting protocols:

• Original/discrete: reports battery as levels 0–4, mapped to 0%/25%/50%/75%/100%

• Gen 2/percentage: reports battery as a direct 0–100 percentage

Previously, the code guessed which protocol to use at runtime by inspecting the raw battery data bytes (status byte value, battery value > 4). This heuristic had a known edge case: Gen 2 devices at 1–4% battery while charging would be misdetected as discrete-protocol devices, inflating the reported level (e.g. 2% shown as 50%).

Three files changed:

1. hid_device.hpp — Adds matched_product_id_ field with getter/setter to the base HIDDevice class, so device implementations can know which specific product variant was matched.
2. device_registry.cpp — Calls setMatchedProductId() when a device is matched during discovery, storing the actual USB product ID on the device instance.
3. steelseries_arctis_nova_7.hpp — Replaces the heuristic detection with a lookup against a known list of discrete-battery product IDs. If the matched PID is in the list, discrete protocol is used; otherwise, percentage protocol is used. This eliminates the edge-case misreporting entirely.

Checklist

• [v] I adjusted the README (if needed)
• [v] For new features in HeadsetControl: I discussed it beforehand in Issues or Discussions and adhered to the wiki