Hardware fixes: issue version, installer Cyrillic, console TUIs (0.9.2)

- /etc/issue shows the Das OS version instead of the kernel's; the server
  installer carries it into the installed system.
- das-server-installer: setfont -C /dev/tty0 before the language menu
  (sudo runs it in its own pty, so the Cyrillic was drawn as Latin), and
  floppy drives are no longer offered as install targets.
- ncdu on the desktop image and in das-server 0.4.0.
- das-shell 0.2.0: each prompt line sets its own color; the dbanner start
  screen buttons are no longer covered by the key bar; on the Linux
  console (TERM=linux) dprompt and dbanner draw solid borders and swap
  the glyphs that no console font has (▊▎▔▁ and others) for ones it has.

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

srcpkgs/das-shell/files/tests/test_prompt.py

@@ -35,6 +35,11 @@ class PresetTest(unittest.TestCase):
         self.assertNotIn("──", text(d))
         self.assertIn("─[main*]─[.venv]─[jobs:2]", text(d, git="main*", venv=".venv", jobs=2))
 
+    def test_each_line_sets_its_color(self):
+        # Readline redraws only the last line, so it must not rely on the first
+        ps1 = prompt.script(prompt.load_preset("das")).split("PS1='", 1)[1].split("'", 1)[0]
+        self.assertTrue(ps1.split("\n")[1].startswith("\\[\\e[0;31m\\]└"), ps1)
+
     def test_unknown_segments_are_dropped(self):
         d = prompt.normalize({"segments": [{"type": "nope"}, {"type": "cwd"}]})
         self.assertEqual([s["type"] for s in d["segments"]], ["cwd"])