fix(dashboard): decode vacuum-extend diagnostics values

[dacrypt]

Summary

• decode the known X20+ vacuum-extend enum-backed diagnostics tiles into human labels in Mission Control
• preserve the raw siid 4 values beside each decoded label for debugging
• bump version/changelog/backlog for the shipped patch release

User value

Mission Control no longer makes users mentally translate raw diagnostics values like 0, 1, or 3 for cleaning mode, mop mode, waterbox status, resume-after-charge, and carpet boost.

Research basis

• official xiaomi.vacuum.c102gl MIoT/OpenHAB mappings confirm cleaning-mode = Quiet/Standard/Medium/Strong and mop-mode = Low/Medium/High
• the same sources confirm waterbox-status = No/Yes and both break-point-restart + carpet-press = Close/Open
• hass-xiaomi-miot issue #2767 still keeps room-cleaning changes in the higher-risk bucket, so this stays in the safe diagnostics/UI lane

Tests

• added a dashboard regression that failed before the new enum formatter/mappings existed
• ran:
  • .venv/bin/python -m pytest tests/ -v
  • .venv/bin/ruff check src/ tests/
  • .venv/bin/ruff format --check src/ tests/
  • .venv/bin/mypy src/xiao/

Risk

Low: frontend-only formatting change for existing diagnostics values; raw values remain visible and task-status stays untouched.