Release v1.1.2

Fixed

• Daily Water Usage, Weekly Water Usage, and Money Saved no longer show "Unknown".
  • Usage statistics now match the current period and fall back to the most recent
    period the API returns, instead of failing when the API omits the current day
    or formats the ISO week differently than expected.
  • Money Saved is now computed locally (the cloud returns dollarsSaved: null),
    matching the AquaTru app: bottles = ceil(purifiedAmount / bottleSize) and
    money = (purifiedAmount / bottleSize / quantityInPack) * waterCost.
• Bottles Saved now matches the value shown in the AquaTru app. It is derived
  from total water purified and the configured bottle size; the cloud's
  bottleSaved field uses a different bottle size and under-reported the count.
• Reworked MQTT reconnection so it no longer races the AWS IoT SDK's built-in
  auto-reconnect (which previously could create duplicate connections); a connect
  lock now serializes connection rebuilds.
• Credential refresh now also runs while temporarily disconnected, so an expiry
  that coincides with a dropped connection can recover (previously it could get
  stuck retrying with expired credentials).
• Removed unreachable authentication-error handling during setup; auth failures
  correctly trigger the re-authentication flow.
• Synced strings.json and translations/en.json and added the missing
  Country Code field labels to the login step.

Changed (Home Assistant standards)

• Removed aiohttp from manifest requirements (it is provided by Home Assistant core).
• Added PARALLEL_UPDATES = 0 to the sensor and binary sensor platforms.
• Replaced deprecated asyncio.get_event_loop() with asyncio.get_running_loop().
• Demoted routine operational logs from INFO to DEBUG.
• Diagnostics now use a public coordinator property instead of accessing internals.
• The device model shown in Home Assistant now reflects the actual device model
  instead of a hardcoded value.
• Timestamps are now timezone-aware; modernized datetime usage.

Removed

• Dead access_token plumbing in the MQTT client (Cognito uses an unauthenticated
  identity, so the token was never sent).
• 27 unused constants.

Internal / tests

• Migrated the test suite to MockConfigEntry, added the required
  enable_custom_integrations fixture, and updated mocks/assertions for the
  current Home Assistant version. Full suite passing (77 tests).
• Applied ruff autofixes (import sorting, unused-import removal, pyupgrade).