stylix: keep wallpaper tints in surfaces, neutralise foreground only

Previous override was too aggressive — neutralising every base00..07
slot stripped the wallpaper character out of backgrounds. Narrow the
override to base03..07 so surfaces (base00..02) keep the tint while
text and muted foreground go neutral. Accents stay wallpaper-derived.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

settings/stylix.nix

@@ -12,18 +12,17 @@
       # under home-manager.users.fred.stylix.targets.<x>.enable = false.
       autoEnable = true;
 
-      # Keep accent slots (base08..0F) wallpaper-derived for that
+      # Hybrid: keep wallpaper-derived surfaces (base00..02) so dark
-      # character, but neutralise the surfaces (base00..07) so the
+      # backgrounds still carry the image's tint, but neutralise the
-      # background doesn't pick up the wallpaper tint.
+      # foreground (base05..07) and mid-tones (base03..04) so text and
+      # syntax read crisply instead of being washed in warm cream.
+      # Accents (base08..0F) stay wallpaper-derived for character.
       override = {
-        base00 = "1a1a1a"; # default background
+        base03 = "5a5a5a"; # comments, invisibles
-        base01 = "262626"; # lighter background (status bars, line numbers)
+        base04 = "9a9a9a"; # muted foreground
-        base02 = "383838"; # selection background
+        base05 = "e0e0e0"; # default foreground (was warm cream)
-        base03 = "5a5a5a"; # comments, invisibles, line highlight
-        base04 = "828282"; # dark foreground (status bar)
-        base05 = "e0e0e0"; # default foreground
         base06 = "f0f0f0"; # light foreground
-        base07 = "ffffff"; # light background
+        base07 = "ffffff"; # lightest
       };
 
       cursor = {