Provision the JetBrains Mono Nerd Font via the shared home profile

Ghostty and Neovim both render glyphs (statusline icons, file-tree
icons) that need a Nerd Font, and no font was previously provisioned
at all.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

2 files changed, 15 insertions, 0 deletions

diff --git a/modules/home/default.nix b/modules/home/default.nix
index 7a093bf..15f70bd 100644
--- a/modules/home/default.nix
+++ b/modules/home/default.nix
@@ -7,5 +7,6 @@
     ./dotfiles.nix
     ./dev-tools.nix
     ./desktop-apps.nix
+    ./fonts.nix
   ];
 }
diff --git a/modules/home/fonts.nix b/modules/home/fonts.nix
new file mode 100644
index 0000000..26dc924
--- /dev/null
+++ b/modules/home/fonts.nix
@@ -0,0 +1,14 @@
+{ pkgs, lib, ... }:
+let
+  candidateFonts = [ pkgs.nerd-fonts.jetbrains-mono ];
+in
+{
+  home.packages = builtins.filter (lib.meta.availableOn pkgs.stdenv.hostPlatform) candidateFonts;
+
+  # Standalone (non-NixOS) Linux activations don't otherwise get fontconfig
+  # pointed at fonts installed via home.packages - see design.md. Harmless
+  # no-op on Darwin (font discovery there goes through
+  # targets.darwin.fonts, unconditional on this option) and idempotent on
+  # NixOS (already defaults to true via useUserPackages).
+  fonts.fontconfig.enable = true;
+}