fix: apply pending code review — remove redundant lambdas, fix parse_event_time dict handling, bump to v1.2.3

[Copilot]

Two unaddressed code review comments from PRs #35 and #36 were never applied before merging, leaving manifest.json and CHANGELOG.md out of sync with the actual code state.

Changes

• helpers.py — parse_event_time now accepts a full event dict (extracts "time" key) in addition to datetime/string, making it safe to use directly as a sort key= function on event lists
• sensor.py — Removed redundant lambda wrappers at both sorted() call sites:

  # Before
  key=lambda e: parse_event_time(e)
  # After
  key=parse_event_time

• manifest.json — Version bumped 1.2.2 → 1.2.3
• CHANGELOG.md — Added v1.2.3 entry documenting the above fixes

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