feat: add rofi-project-opener for rofi-based project launching

Adds package and HM module for quickly opening projects in terminals.
Uses XDG config file instead of environment variables for better
shell-independence and proper NixOS PATH sourcing.

modules/home-manager/cli/default.nix

@@ -1,6 +1,7 @@
 # CLI/Terminal-related Home Manager modules
 {
   imports = [
+    ./rofi-project-opener.nix
     ./stt-ptt.nix
     ./zellij-ps.nix
   ];