feat: partial refresh support via py-opendisplay 7.11.1

[g4bri3lDev]

Summary

Implements partial refresh for upload_image and drawcustom, superseding the approach in #47 now that py-opendisplay ships native support (thanks @jonasniesner for the groundwork — the per-entry state pattern follows your PR).

• refresh_mode/refresh_type: partial diffs against the entry's PartialState and updates flicker-free via 0x76; full/fast re-baseline the state (doubling as the periodic deghosting refresh). Legacy numeric 2/3 map to partial.
• All panel handling is in the library: automatic fallback to full upload (unsupported panel, etag mismatch, firmware NACK), automatic full-frame region expansion on partial_update_support: 2 panels (Partial refresh (0x76) erases all content outside the rect on EP426 — white-fill at partial START relies on panel-LUT behavior that EP426 doesn't have Firmware#80) — no compute_partial_region monkeypatch, no separate partial_full mode — and identical frames skip the BLE transfer entirely.
• Requirement bump to py-opendisplay==7.11.1: brings partial support (#116), the streaming-only compression gate fixes (#114, also applied to this repo's prepare_image gate), and epaper-dithering 5.0.8 — without which drawcustom's default tone=auto renders bilevel text frames all-black (NaN collapse, epaper-dithering#51).
• UI: selector option is "Partial"; the flicker-free behavior and fallback semantics are explained in the field descriptions.

Hardware verification (EN05, EP426 800×480 MONO, fw 2.0, partial_update_support: 2, via a live HA dev instance)

• drawcustom scenario suite over BLE, camera-verified: timestamp ticks over a dithered gray field (3 cycles, zero degradation), inverted status bar appear/replace, progress bar updates, and an identical-payload call correctly logging No pixels changed; skipping upload with no transfer. Etag chain unbroken across 7 operations; ~2.3 KB compressed wire per full-frame partial.
• Known cosmetic caveat: large solid black fills written across successive partials can show slightly different black densities (partial-waveform lighter blacks). Text is unaffected; an occasional full refresh restores uniform blacks — which the state handling makes cheap.

Notes

• full remains the default; partial-by-default with a configurable every-N deghost full could be a follow-up.
• State is in-memory per entry: first upload after an HA restart is a full refresh, then partials resume. PartialState.to_bytes() persistence via a Store is possible later.

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