feat(ghostty): ajout du terminal Ghostty (réglages Omarchy)

Police JetBrains Mono Nerd Font, thème Catppuccin Mocha, marges,
Shift+Entrée distinct d'Entrée pour les TUI. Sakura reste le terminal
d'i3 pour comparer.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

home.nix

@@ -52,6 +52,7 @@
   imports = [
     ./packages.nix
 
+    ./programs/ghostty.nix
     ./programs/git.nix
     ./programs/i3.nix
     ./programs/pi.nix

programs/ghostty.nix

@@ -0,0 +1,33 @@
+{ ... }:
+
+# Réglages repris d'Omarchy - https://github.com/basecamp/omarchy/blob/master/config/ghostty/config
+{
+  programs.ghostty = {
+    enable = true;
+    enableZshIntegration = true;
+    settings = {
+      font-family = "JetBrainsMono Nerd Font";
+      font-size = 10;
+      theme = "Catppuccin Mocha";
+
+      window-padding-x = 14;
+      window-padding-y = 14;
+      confirm-close-surface = false;
+      resize-overlay = "never";
+
+      cursor-style = "block";
+      cursor-style-blink = false;
+      shell-integration-features = "no-cursor,ssh-env";
+
+      keybind = [
+        "shift+insert=paste_from_clipboard"
+        "control+insert=copy_to_clipboard"
+        # Distingue Shift+Entrée d'Entrée pour les TUI (Claude Code…)
+        "shift+enter=csi:13;2u"
+      ];
+
+      # Lenteurs sous Hyprland - https://github.com/ghostty-org/ghostty/discussions/3224
+      async-backend = "epoll";
+    };
+  };
+}