fix(updates): review findings in updatesctl

A git hash starting with a letter (3.1-a59215d) ordered behind its base,
because any trailing alphabetic chunk counted as a pre-release; only
alpha, beta, rc, pre and dev do now. Trailing zeros (1.14 against
1.14.0) compare equal instead of reading as an upstream bump. A bad line
in the slackpkg blacklist is skipped rather than crashing the script and
leaving the drawer with nothing. An AppImage keeps its key over a
flatpak of the same name, as the spec orders them, and flatpak list has
a timeout. A Slackware upgrade compares version and build, so an arch
change alone is not a row. The spec's prose now matches the code: the
upstream comparison includes the installed version.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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