revert "nix: merge all nix programs into applications.nix"

This reverts commit 29296d8bbc1ec338643883b97bbe82aa0b21d424.

modules/applications.nix

@@ -1,8 +1,5 @@
 { config, lib, pkgs, ... }:
 
-let
-  isLinux = pkgs.hostPlatform.system == "linux";
-in
 {
   environment.systemPackages = with pkgs; [
     spotify
@@ -12,18 +9,5 @@ in
     element-desktop
     keepassxc
     ani-cli
-  ]
-  ++ lib.optionals (pkgs.hostPlatform.system == "linux") [
-    # linux-specific/broken on OSX
-    mpv
-    ghostty
-    thunderbird
-    krita
-    openutau
-  ]
-  ++ lib.optionals (pkgs.hostPlatform.system == "darwin") [
-    iina
-    utm
-    raycast
   ];
 }