feat: the updates card moves to the quickshell drawerHEADmaster

The card was a copy of nvtable's table, where installed-behind and
repo-behind share a row and are told apart by colour, and it read
"shipped" from the .info rather than the binary repo. The drawer's
updates page replaces it: one row per package under the action it needs
next, Slackware included. Removed: the card, its sampler and the
nvchecker run it started every 30 minutes (the drawer runs nvchecker
when its result is older than that), nvtable_parse with its test and
fixture, and the package-up icon. The card's slot in the layout is left
open; rearranging the board is a separate decision.

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

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