Fix CHRONOLOGICAL_ORDER to reject camera clock-reset EXIF dates

A real album (irregular.ninja/so.war.das) surfaced the bug: a Fujifilm
X100V whose battery died reset its clock to 2000-01-01, and every EXIF
timestamp on that roll was stamped with the bogus date instead of being
omitted. Trusting it at face value sorted that whole roll to the front
of the album, ahead of hundreds of correctly-dated 2020s photos.

EXIF years before 2001 are now treated the same as a missing date tag.
The no-date fallback also switches from source mtime to filename order,
since mtime is not reliable either -- bulk-copying/rsyncing an incoming
directory commonly rewrites every file's mtime to the transfer time,
unrelated to capture order -- while sequential camera filenames track
real shooting order even across a clock reset.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

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