v0.3.0

Added

• Multi-document ADF scans are merged into a single PDF (issue #1). Scanners
  that return one PDF per page are now handled; bundle-mode scanners keep the
  single-file fast path. Adds a pypdf requirement.
• pages_done reports the real page count of the resulting PDF for
  bundle-mode scanners.

Changed

• Test suite (pytest + pytest-homeassistant-custom-component) and ruff lint
  run in CI alongside hassfest and HACS validation.
• Card colours follow the active HA theme; single_config_entry declared;
  sensor grouped under a device.