Terminal: Das prompt, dprompt and dbanner (0.9.1)

- das-shell 0.1.0: the Das two-line bash prompt by default (replaces the
  PS1 of Void's skel .bashrc once), dprompt (Textual prompt builder with
  presets and live preview) and dbanner (SSH login banner editor: canvas
  tools, fields with values, widgets, das-banner service for cached ones,
  Das OS logo and tryzub pictures). Python tests in make test.
- das-server 0.3.0 depends on das-shell; the server installer mentions
  dprompt and dbanner; the desktop image includes it.
- run-qemu.sh forwards the guest's SSH to localhost:2222.
- Hardware fixes: Ventoy menu icon, boot menu titles "Das OS <version>".

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

srcpkgs/das-shell/files/share/banner/widgets/snapshots.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+# dbanner-title-uk: Знімки Btrfs (snapper)
+# dbanner-title-en: Btrfs snapshots (snapper)
+# dbanner-mode: cached
+# dbanner-interval: 3600
+# Number of snapper snapshots of / and the date of the last one; needs root.
+. "${0%/*}/lib.sh"
+command -v snapper >/dev/null || exit 0
+((EUID == 0)) || exit 0
+mapfile -t rows < <(timeout 10 snapper -c root --csvout list --columns number,date 2>/dev/null | tail -n +3)
+((${#rows[@]})) || exit 0
+last=${rows[-1]#*,}
+echo "$Bold$(say "Знімки:" "Snapshots:")$Off ${#rows[@]}, $(say "останній" "last") $Cyan${last%:*}$Off"