Adopt Omarchy 4 theme conventions for Lupine

Convert the Lupine theme to the semantic color system introduced in the
quattro/Omarchy 4 line:

- Rewrite colors.toml from the old accent/foreground/background/color0-15
  scheme to the semantic palette (mode, bg/fg ramp, named ANSI hues, and
  bright_* variants). The chromatic palette is preserved exactly; only the
  keys are renamed.
- Replace the empty light.mode marker with mode = "light".
- Drop the hand-shipped btop.theme and chromium.theme; both are now
  generated from default/themed/*.tpl at theme-set time.

Selection now follows the convention used by the other light themes
(selection_foreground = bright_fg over a light selection background)
instead of the previous inverted dark selection bar.

themes/lupine/colors.toml

@@ -1,31 +1,28 @@
-# UI Colors (extended)
+mode = "light"
+
 accent = "#3264eb"
-cursor = "#212121"
 
-# Primary colors
-foreground = "#212121"
-background = "#fafafa"
+bg = "#fafafa"
+dark_bg = "#ececec"
+darker_bg = "#dedede"
+lighter_bg = "#f5f5f5"
+selection = "#d0d0d0"
+muted = "#9e9e9e"
+dark_fg = "#757575"
+fg = "#212121"
+light_fg = "#424242"
+bright_fg = "#000000"
 
-# Selection colors
-selection_foreground = "#fafafa"
-selection_background = "#212121"
+red = "#c900c4"
+yellow = "#026fde"
+green = "#026fde"
+cyan = "#0c67de"
+blue = "#3264eb"
+magenta = "#8a4ad7"
 
-# Normal colors (ANSI 0-7)
-color0 = "#fafafa"
-color1 = "#c900c4"
-color2 = "#026fde"
-color3 = "#026fde"
-color4 = "#3264eb"
-color5 = "#8a4ad7"
-color6 = "#0c67de"
-color7 = "#212121"
-
-# Bright colors (ANSI 8-15)
-color8 = "#757575"
-color9 = "#f930fb"
-color10 = "#358fff"
-color11 = "#358fff"
-color12 = "#5482ff"
-color13 = "#b363ff"
-color14 = "#3986ff"
-color15 = "#000000"
+bright_red = "#f930fb"
+bright_yellow = "#358fff"
+bright_green = "#358fff"
+bright_cyan = "#3986ff"
+bright_blue = "#5482ff"
+bright_magenta = "#b363ff"