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/python/das_shell/tui_common.py

@@ -15,9 +15,39 @@ from textual.widgets import Button, Input, Label, Select
 
 from . import colors
 from .i18n import t
+from .prompt import CONSOLE_GLYPHS as PROMPT_CONSOLE_GLYPHS
 
 NONE = "-"  # Select has no None value
 
+# The Linux console's fonts hold at most 512 glyphs (cyr-sun16, Terminus: none has
+# the eighth blocks ▊▎▔▁ Textual draws buttons, inputs and lists with), so the
+# missing ones come out as squares. There we draw with what the fonts do have.
+CONSOLE = os.environ.get("TERM") == "linux"
+CONSOLE_BORDERS = ("tall", "wide", "panel", "tab", "hkey", "vkey", "round", "heavy", "dashed", "inner", "outer")
+CONSOLE_GLYPHS = str.maketrans({
+    **PROMPT_CONSOLE_GLYPHS,
+    "▁": "▄", "▂": "▄", "▃": "▄", "▅": "▄", "▆": "▄", "▇": "█", "▔": "▀", "▉": "█",
+    "▊": "▌", "▋": "▌", "▍": "▌", "▎": "▌", "▏": "▌", "▕": "▐",
+    "━": "─", "╸": "─", "╺": "─", "┃": "│", "┏": "┌", "┓": "┐", "┗": "└", "┛": "┘",
+    "╭": "┌", "╮": "┐", "╰": "└", "╯": "┘", "╱": "/", "╲": "\\",
+    "—": "-", "…": ".", "×": "x", "✕": "x", "✓": "v", "☑": "x", "○": "o", "⭘": "o", "◢": "▀",
+})
+
+
+def console_mode():
+    """On the Linux console: swaps the borders and glyphs its fonts lack. Call
+    before the app starts."""
+    if not CONSOLE:
+        return
+    from textual import _border
+    from textual.drivers.linux_driver import LinuxDriver
+    for kind in CONSOLE_BORDERS:
+        _border.BORDER_CHARS[kind] = _border.BORDER_CHARS["solid"]
+        _border.BORDER_LOCATIONS[kind] = _border.BORDER_LOCATIONS["solid"]
+    _border.get_box.cache_clear()
+    write = LinuxDriver.write
+    LinuxDriver.write = lambda self, data: write(self, data.translate(CONSOLE_GLYPHS))
+
 
 def color_options(allow_none=True):
     names = {