hyprland: drop hyprspace, cut compositor latency

Removes the Hyprspace plugin entirely — blank-window snapshots from the
0.52.0/0.52.1 ABI skew aren't worth the patch-pin work right now. With
the overview gone, also rebalances the desktop for input latency:

- decoration.blur disabled (two passes at 3440x1440 were the biggest
  per-frame GPU cost)
- render.direct_scanout = true so fullscreen apps bypass the compositor
- misc.vrr = 2 (always on) instead of fullscreen-only

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

settings/hyprland.nix

@@ -57,12 +57,6 @@
         enable = true;
         systemd.variables = [ "--all" ];
 
-        # Native `plugin = ...` directive crashes Hyprland on the current
-        # nixpkgs combo (compositor 0.52.1 vs plugin built for 0.52.0).
-        # HM's plugins list routes through `hyprctl plugin load` at runtime,
-        # which tolerates the patch-level skew.
-        plugins = [ pkgs.hyprlandPlugins.hyprspace ];
-
         settings = {
           # Pin the OC'd 190 Hz mode so we don't fall back to 60.
           monitor = "DP-2,3440x1440@190,0x0,1";
@@ -91,13 +85,18 @@
 
           decoration = {
             rounding = 8;
+            # Blur disabled — two passes at 3440x1440 was the biggest
+            # contributor to per-frame compositor latency. Re-enable with
+            # smaller size/passes if you miss the look.
             blur = {
-              enabled = true;
-              size = 6;
-              passes = 2;
+              enabled = false;
             };
           };
 
+          render = {
+            direct_scanout = true; # fullscreen apps bypass compositor
+          };
+
           animations = {
             enabled = true;
             # speed = tenths of a second; 2 = 0.2s. Drop to 1 for instant-ish.
@@ -132,7 +131,7 @@
             disable_hyprland_logo = true;
             disable_splash_rendering = true;
             focus_on_activate = true;
-            vrr = 1;     # 1 = on for fullscreen, 2 = always
+            vrr = 2;     # 1 = on for fullscreen, 2 = always
             vfr = false; # keep compositor ticking, don't idle between frames
           };
 
@@ -143,17 +142,6 @@
             "immediate, class:^(gamescope)$"
           ];
 
-          # Hyprspace overview plugin — see README for full option set
-          plugin.overview = {
-            centerAligned = true;
-            hideTopLayers = true;
-            hideOverlayLayers = true;
-            showNewWorkspace = true;
-            exitOnClick = true;
-            exitOnSwitch = true;
-            dragAlpha = 0.8;
-          };
-
           # Mirror the GNOME bindings so muscle memory carries over
           bind = [
             "$mod, T, exec, $term"
@@ -168,9 +156,6 @@
             "$mod, P, pseudo"
             "$mod, S, togglesplit"
 
-            # Hyprspace overview — routed via hyprctl because home-manager
-            # loads the plugin in exec-once, after config parse.
-            "$mod, SPACE, exec, hyprctl dispatch overview:toggle"
 
             # Focus
             "$mod, left,  movefocus, l"