refactor(home): default hyprland kb_layout to neutral us

the baseline hard-coded a german layout, leaking a personal value into a
module meant to be region-neutral. ship `mkDefault "us"` like `console.keyMap`
so a consumer overrides it from their inventory.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

CLAUDE.md

@@ -48,7 +48,8 @@ declaratively in `modules/home.nix` (`wayland.windowManager.hyprland`, `programs
 `programs.foot`). Font is JetBrainsMono Nerd Font; Waybar/foot use Nerd Font glyphs
 (nf-md set) for icons, so new glyphs should come from that set for visual consistency.
 
-Hyprland uses the **master** layout and a **German** keyboard (`kb_layout = "de"`).
+Hyprland uses the **master** layout; `kb_layout` ships neutral (`mkDefault "us"`),
+overridden per-inventory like `console.keyMap`.
 Look deliberately minimal: animations, blur, rounding, and shadows are all turned
 **off** on purpose — don't reintroduce them when adding desktop tweaks.
 

modules/home.nix

@@ -595,7 +595,8 @@ in
       };
 
       input = {
-        kb_layout = "de";
+        # Neutral default; set the real layout in your inventory (like console.keyMap).
+        kb_layout = lib.mkDefault "us";
         follow_mouse = 1;
         numlock_by_default = true;
       };