Use InvariantCulture when parsing machine-generated dates

DateTime.TryParse without an IFormatProvider falls back to the current
thread culture, so the same string can parse differently (or fail)
depending on the server's locale. None of these call sites deal with
user-entered text - they parse dates that come from filenames, an
HTTP header, ffprobe metadata and values the app itself wrote to the
auth database - so InvariantCulture is the correct provider everywhere
here.

Fixes the S6580 / CA1305 warnings on these call sites.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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