sway: fix bonsai to be visible in the sandbox

hosts/common/programs/bonsai.nix

@@ -112,10 +112,14 @@ in
 
     services.bonsaid = {
       description = "bonsai: programmable input dispatcher";
+      dependencyOf = [ "sway" ];  # to ensure `$XDG_RUNTIME_DIR/bonsai` exists before sway binds it
       partOf = [ "graphical-session" ];
       # nice -n -11 chosen arbitrarily. i hope this will allow for faster response to inputs, but without audio underruns (pipewire is -21, dino -15-ish)
       command = "nice -n -11 bonsaid -t $HOME/.config/bonsai/bonsai_tree.json";
       cleanupCommand = "rm -f $XDG_RUNTIME_DIR/bonsai";
+      readiness.waitExists = [
+        "$XDG_RUNTIME_DIR/bonsai"
+      ];
     };
   };
 }

hosts/common/programs/sway/default.nix

@@ -190,7 +190,10 @@ in
     sandbox.whitelistDri = true;
     sandbox.whitelistX = true;  # sway invokes xwayland itself
     sandbox.whitelistWayland = true;
-    sandbox.extraRuntimePaths = [ "sway" ];
+    sandbox.extraRuntimePaths = [
+      "bonsai"
+      "sway"
+    ];
     sandbox.extraPaths = [
       # "/dev/input"
       "/run/seatd.sock"  #< required if not using `logind` systemd login manager