v3.4.0-beta.13

Quick Charge Duration faithfully mirrors the live register (#251, LXP-LB testing by @ivanfmartinez).

• The Quick Charge Duration number now shows exactly what holding register 234 holds — idle and while charging — instead of a retained UI preference, so it always agrees with what the inverter reports. The firmware governs that value (it starts a charge at its own default, counts down, and rejects changes while quick charge is off). Set it while charging to extend/reduce (writes reg 234); setting it while idle now returns a clear "Quick Charge must be running to set its duration" message instead of silently storing a value the inverter would reject. The preference is now used only on the CLOUD path (the start minute).
• The Quick Charge Remaining sensor now reports seconds — preferring input register 210 (the dedicated seconds countdown on newer firmware) with a holding-register-234 fallback; CLOUD reads it from the API.

The Duration number (holding reg 234, writable minutes) and the Remaining sensor (input reg 210, read-only seconds) are intentionally kept as two separate entities — one per hardware register.

Polling-speed / Modbus block-size is tracked separately in #254.

Requires pylxpweb 0.9.36b12 (installed automatically via HACS).