feat: add a refine dithering option to image uploads

[g4bri3lDev]

Summary

Two commits:

fix: update py-opendisplay to 7.18.1

7.16.0 → 7.18.1 in manifest.json, pyproject.toml and uv.lock. For users this brings:

• Image preparation off the event loop: upload_image() used to dither on HA's loop. The integration's own prepare_image() path was already in an executor, so this mainly helps other callers, but it's the same library fix.
• More robust BLE: the notification queue is flushed on every disconnect, and config reads ignore stray frames.
• Config write-back keeps packets the parser doesn't recognise (new unparsed_tail field).
• Security: epaper-dithering 6.1.1, rebuilt with pyo3 0.29.3 for two advisories.

Diagnostics now redact unparsed_tail. It holds raw bytes of unrecognised config packets, so its content is unknown; without redaction it would appear as hex in downloads. A new test uses a non-empty value and asserts REDACTED. (The main snapshot shows '', because HA's redaction leaves empty values as they are.) This was flagged by Copilot on the equivalent core change.

feat: add a refine dithering option to image uploads

New optional refine_dithering switch (off by default) on upload_image (under Additional options) and drawcustom, passed to prepare_image(..., dbs=...).

DBS (Direct Binary Search) refines the dithered image to minimise the error as perceived at a normal viewing distance. The library sizes its eye model from the panel's real pixel density, taken from the config's physical size. It typically reproduces colours and tones more faithfully (see the epaper-dithering README comparison), but it's slower: ~0.3 s for 800×480 on a multi-core desktop, longer on a Pi. It runs inside the existing executor job, so it never blocks the loop, and with the sleepy-device queue it's computed once at queue time.

UI metadata follows each action's existing pattern: upload_image is translated through strings.json and translations/en.json; drawcustom uses inline name/description in services.yaml. No icons.json change, since fields have no icons there.

Tests

• 5 new tests:
  • refine_dithering reaches prepare_image as dbs (off by default, on when set), for both actions;
  • unparsed_tail redaction.
• Both matrix legs: scripts/test 232 passed, scripts/test --min-ha 232 passed.
• ruff check and ruff format --check clean; scripts/verify_translations.py passes; compileall passes.

Heads-up

#133 also bumps py-opendisplay (to 7.17.0) in the same three files, so whichever merges second needs a quick rebase. Keep 7.18.1.