add command_not_found_handler to .zshrc

modules/applications/zsh.nix

@@ -29,8 +29,33 @@ in
         plugins = [ "git" ];
         theme = "frisk";
       };
-      loginExtra = ''
-        eval "$(zoxide init --cmd cmd zsh)"
+      initContent = ''
+        command_not_found_handler() {
+          local cmd="$1"
+
+          # If the thing you typed is a regular file, try to open it
+          if [[ -f "$cmd" ]]; then
+              # Determine MIME type
+              local mime
+              mime=$(xdg-mime query filetype -- "$cmd" 2>/dev/null)
+
+              if [[ -n "$mime" ]]; then
+                  print "Opening '$cmd' with xdg-open (MIME: $mime)…"
+                  xdg-open "$cmd" >/dev/null 2>&1 &
+                  return 0
+              else
+                  print "No known MIME type for '$cmd'."
+                  print "You can assign one using:"
+                  print "  xdg-mime install <file>.xml"
+                  print "  xdg-mime default <app>.desktop $cmd"
+                  return 1
+              fi
+          fi
+
+          # Default: real command not found
+          print "zsh: command not found: $cmd"
+          return 127
+        }
       '';
     };
   };