fix(swayosd): ensure swayosd starts reliably

- Add explicit 'systemctl --user start swayosd' to Hyprland exec-once
- Harden systemd service definition with proper dependencies and targets

apps/hyprland/hypr/exec.nix

@@ -15,6 +15,7 @@
       # essentials
       "hyprpm reload -n"
       "systemctl --user start hyprpolkitagent"
+      "systemctl --user start swayosd"
       "hyprsunset -t 4500" # TODO: must be optional
     ];
   };

apps/swayosd/default.nix

@@ -10,11 +10,14 @@
     Unit = {
       StartLimitBurst = lib.mkForce 5;
       StartLimitIntervalSec = lib.mkForce 30;
+      After = [ "graphical-session.target" ];
+      PartOf = [ "graphical-session.target" ];
     };
     Service = {
       Restart = lib.mkForce "on-failure";
-      RestartSec = lib.mkForce "100ms";
+      RestartSec = lib.mkForce "1s";
     };
+    Install.WantedBy = [ "graphical-session.target" ];
   };
 
   wayland.windowManager.hyprland.settings = {