feat(terminal): themed Kitty when OpenGL < 4.3 (#95)

Ghostty needs OpenGL 4.3; older GPUs (Intel HD 4000) top out at 4.2.
Installer probes glxinfo and writes settings.terminal=kitty into
theme-state when below the floor. modules/home/kitty.nix enables Kitty
with the same palette, mono font, and opacity as Ghostty so the fallback
still looks like Nomarchy.

Default machines stay Ghostty-only (no kitty in the HM closure). Doctor
and calendar still invoke Ghostty by class — V3 on Acer for SUPER+Return.

Verified: V0 flake check; installer-safety; HM with terminal=kitty builds
themed kitty.conf + TERMINAL=kitty; default template has no kitty bin.

modules/home/kitty.nix

@@ -0,0 +1,63 @@
+# Kitty — fallback terminal when Ghostty cannot run (OpenGL < 4.3 on
+# older GPUs, e.g. Intel HD 4000). Themed from the same theme-state.json
+# as Ghostty so a machine that needs the fallback still looks like
+# Nomarchy. Enabled when nomarchy.terminal is "kitty" (installer sets
+# that after a GL probe) or when nomarchy.kitty.enable is forced on.
+{ config, lib, ... }:
+
+let
+  t = config.nomarchy.theme;
+  c = t.colors;
+  # Default terminal may be a bare name ("kitty") or a path; match the
+  # basename so settings.terminal = "kitty" and nomarchy.terminal =
+  # "${pkgs.kitty}/bin/kitty" both light this module.
+  terminalIsKitty =
+    let
+      term = config.nomarchy.terminal;
+      base = lib.last (lib.splitString "/" term);
+    in
+    base == "kitty" || lib.hasPrefix "kitty " term;
+
+  enabled = config.nomarchy.kitty.enable || terminalIsKitty;
+
+  # Kitty colorN = ANSI 0–15 from the theme palette.
+  colorSettings = lib.listToAttrs (
+    lib.imap0 (i: color: {
+      name = "color${toString i}";
+      value = color;
+    }) t.ansi
+  );
+in
+{
+  config = lib.mkIf enabled {
+    programs.kitty = {
+      enable = true;
+      shellIntegration.enableBashIntegration = true;
+      shellIntegration.enableZshIntegration = true;
+
+      font = {
+        name = t.fonts.mono;
+        size = t.fonts.size;
+      };
+
+      settings = {
+        background = c.base;
+        foreground = c.text;
+        cursor = c.accent;
+        cursor_text_color = c.base;
+        selection_background = c.overlay;
+        selection_foreground = c.text;
+        url_color = c.accent;
+        active_border_color = c.accent;
+        inactive_border_color = c.surface;
+        # Match Ghostty's padding / opacity so the two terminals feel
+        # like the same product when a machine falls back.
+        background_opacity = t.ui.terminalOpacity;
+        window_padding_width = lib.mkDefault 12;
+        confirm_os_window_close = lib.mkDefault 0;
+        enable_audio_bell = lib.mkDefault false;
+        wayland_titlebar_color = lib.mkDefault "background";
+      } // colorSettings;
+    };
+  };
+}