feat(updates): the drawer tile and page

The tile counts what can be installed now (Slackware and the binary
repo) and what only needs a build, and goes accent when there is
something to install. It runs updatesctl while the drawer is open and
not otherwise; a result over 30 minutes old is followed by a refresh
that runs nvchecker, never after a refresh, so a failing nvchecker
cannot loop.

The page has one section per next action: Slackware upgrades, new and
removed first, then upgrade here, awaiting build, upstream newer, app
updates, the order the work is done in. Each row names the package, the
repo it comes from and the one version jump its action covers. A source
that could not be read says so under the section it empties instead of
reading as nothing pending.

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

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