feat: wireview pin-imbalance warning, per-pin rating bars, pin_imbalance_a

- Per-pin bar now scales against the 9.2 A per-pin rating (10 A full
  scale, red at/over rating) instead of the 55 A total connector OCP
- Debounced app-wide warning banner (visible on all tabs) when the
  current between two pins diverges by > 2 A for ~7 s - the signature
  of a bad pin contact that can overheat and melt the 12VHPWR
  connector; 5 s grace period after clearing
- New pin_imbalance_a sample field (max - min pin current) in both the
  serial and hwmon sample builders, plus frontend type
- Docs: README + WireView.md cover the warning and threshold; fresh
  screenshot with the new per-pin labels
- Tests: vitest setup + 9 unit tests for the debounce state machine;
  3 new backend checks for pin_imbalance_a

README.md

@@ -15,8 +15,8 @@ NVCurve brings MSI Afterburner-style per-point voltage-frequency curve control t
 > **Blackwell GPU memory** — This is a specialized fork with extended memory offset support (up to +3000 MHz) for Blackwell GPUs (RTX 50-series). \
 > **Fan Controls** — There is an additional "Fans" tab to setup a customized fan curve, controlling all fans or individual fans. \
 > **Dashboard** — The default tab is an Dashboard with additional information (PCIe link speed, VBIOS information, Max Core Clock, Throttle Reason and much much more.) \
-> **WireView Pro II** — Native monitoring of the Thermal Grizzly WireView Pro II 12VHPWR connector: a dedicated tab shows live temperature, power and current readings — no external exporter or kernel module required. The host needs a one-time setup (udev rule + port access, see [WireView Pro II Setup](docs/WireView.md)); after that the device is auto-detected over USB and the tab only appears while it is connected. \
-> **Authentification** — For production deplyoment, I added authentification with bcrypt hashing to allow only one or multiple people to have access. \
+> **WireView Pro II** — Native monitoring of the Thermal Grizzly WireView Pro II 12VHPWR connector: a dedicated tab shows live temperature, power and current readings — no external exporter or kernel module required. It also raises a big warning in the app header (visible on all tabs) when the current between two power pins diverges by more than 2 A — the signature of a bad pin contact (faulty cable/adapter) that can overheat and melt the connector. The host needs a one-time setup (udev rule + port access, see [WireView Pro II Setup](docs/WireView.md)); after that the device is auto-detected over USB and the tab only appears while it is connected. \
+> **Authentication** — For production deployment, I added authentication with bcrypt hashing to allow only one or multiple people to have access. \
 > Installing the pre-built PyPI package will NOT include these features. You must build from source.
 
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