fix(home): disable catppuccin theme for removed gemini-cli

home/base/core/theme.nix

@@ -8,6 +8,10 @@
   catppuccin = {
     # The default `enable` value for all available programs.
     enable = true;
+    # nixpkgs renamed gemini-cli to antigravity-cli (which dropped catppuccin
+    # theme support); the v26.05 tag still references the old option name.
+    # Remove this line once the catppuccin input moves past the rename.
+    gemini-cli.enable = false;
     cache.enable = true;
     # one of "latte", "frappe", "macchiato", "mocha"
     flavor = "mocha";