feat: airplane mode (#104) + crisper fastfetch logo (#122)

Airplane: runtime Wi-Fi+Bluetooth kill-switch with prior-state restore,
System menu + SUPER+CTRL+R, Waybar plane glyph (self-hides, whole-swap
parity). Fastfetch: chafa sextants at 24×12 (was block 20×10) for a
finer monogram; V2 kitty screenshots under boreal and summer-night.

modules/home/fastfetch.nix

@@ -9,11 +9,15 @@ let
   cfg = config.nomarchy;
   c = cfg.theme.colors;
 
+  # #122: sextants (2×3 subcells) give ~6× the detail of half/full blocks.
+  # Size and raster width stepped up together so the mark still fills the
+  # logo column without looking sparse. Diagonals still staircase a little
+  # (the SVG is an angled N); that is a logo-design limit, not chafa's.
   logo = pkgs.runCommand "nomarchy-fastfetch-logo"
     { nativeBuildInputs = [ pkgs.imagemagick pkgs.librsvg pkgs.chafa ]; } ''
-    rsvg-convert -w 220 ${../nixos/branding/logo.svg} > logo.png
+    rsvg-convert -w 360 ${../nixos/branding/logo.svg} > logo.png
     magick logo.png -fill "${c.accent}" -colorize 100 logo-c.png
-    chafa --format symbols --symbols block --size 20x10 --colors full --polite on logo-c.png > $out
+    chafa --format symbols --symbols sextant --size 24x12 --colors full --polite on logo-c.png > $out
   '';
 in
 {