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.

themes/summer-night/waybar.css

@@ -57,6 +57,7 @@ window#waybar {
 #pulseaudio,
 #custom-powerprofile,
 #custom-nightlight,
+#custom-airplane,
 #language,
 #custom-updates,
 #idle_inhibitor,
@@ -140,6 +141,7 @@ window#waybar {
 #custom-doctor               { color: @red; }
 #idle_inhibitor.activated    { color: @yellow; }
 #custom-nightlight.on        { color: @yellow; }
+#custom-airplane.on        { color: @yellow; }
 #custom-vpn.on               { color: @green; }
 #pulseaudio.muted            { color: @grey0; }
 
@@ -158,6 +160,7 @@ window#waybar {
 #custom-updates,
 #custom-doctor,
 #custom-nightlight,
+#custom-airplane,
 #custom-vpn,
 #custom-notification { font-size: 17px; }