The previous code used `if not mm_history:` to decide whether to fall back to
get_training_status(). If the maxmet API returned a non-empty list with no valid
vo2max values (or a non-list type), the fallback was skipped and nothing stored.
Changes:
- Normalise mm_raw: only use it if it's a list (handles dict/None responses)
- Check valid_from_range: fall back to training_status whenever no usable value
was found in the range query, regardless of whether it returned entries
- Upgrade all related log lines to INFO so the result is visible without debug mode
- Guard the entry loop against non-dict items
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Show the most recently known VO2 max value on days where Garmin has
not produced a new estimate (it only updates after certain activities).
Fix the sync lookback days input resetting to the server value during
polling — the form now initialises from the server once on first load
and is not overwritten by background refetches.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
owain