quickshell: replace macOS-style shell with standalone overview module

Swap the illogical-impulse-derived components for the upstream
quickshell-overview standalone module, update Hyprland keybinds
(Super+Tab overview, rofi launcher), refresh foot colors and
starship theme, and adjust related host/module wiring.

home/foot.nix

@@ -33,37 +33,42 @@ in
         style = "beam";
         blink = "yes";
         beam-thickness = 1.5;
-        color = "0e0e0e cffc00";
       };
 
       mouse = {
         hide-when-typing = "yes";
       };
 
-      colors = {
+      colors-dark = {
+        # Silicon Volt palette (matches home/hypr theme + mako):
+        # bgPrimary #131313, bgSecondary #0e0e0e, glassBg #1c1b1b,
+        # textPrimary #ffffff, textSecondary #e5e2e1, textMuted #adaaaa,
+        # accents: volt #cffc00, coral #ff7a59, blue #00bfff
         alpha = 0.92;
         background = "131313";
         foreground = "e5e2e1";
 
-        # Silicon Volt palette (anish.govind.cc)
-        regular0 = "1c1b1b";  # Glass Black
-        regular1 = "ff7a59";  # Coral Red
-        regular2 = "cffc00";  # Electric Lime (green)
-        regular3 = "e3ff66";  # Volt Light (yellow)
-        regular4 = "00bfff";  # Sky Blue
+        # Cursor text and cursor (background) colors
+        cursor = "0e0e0e cffc00";
+
+        regular0 = "0e0e0e";  # bgSecondary
+        regular1 = "ff7a59";  # accentCoral
+        regular2 = "cffc00";  # accentVolt (green)
+        regular3 = "e3ff66";  # accentVoltLight (yellow)
+        regular4 = "00bfff";  # accentBlue
         regular5 = "c6c6c7";  # Neutral Gray (magenta)
         regular6 = "66d9ff";  # Light Cyan
-        regular7 = "e5e2e1";  # Light Gray
+        regular7 = "e5e2e1";  # textSecondary
 
         # Bright Colors
-        bright0 = "5c5a59";   # Dim Gray
+        bright0 = "2a2929";   # surfaceVariant
         bright1 = "ff9a82";   # Bright Coral
         bright2 = "dfff66";   # Bright Lime
         bright3 = "f0ff8c";   # Bright Volt
         bright4 = "66d9ff";   # Bright Blue
         bright5 = "e0e0e1";   # Bright Gray
         bright6 = "99e6ff";   # Bright Cyan
-        bright7 = "ffffff";   # Pure White
+        bright7 = "ffffff";   # textPrimary
 
         # Selection & URLs - volt lime selection like the site
         selection-foreground = "0e0e0e";