Make SAM intercept X marker 5x larger

Bump markerXRadius from 8 to 40 px in render-settings.json so the
intercept point on nuke trajectories is easier to spot. The marker
shader draws in normalized quad space, so the stroke and outline
scale with it automatically. Also raise the debug GUI slider max
for the X marker from 16 to 64 to keep the new value tunable.

src/client/render/gl/debug/Layout.ts

@@ -483,7 +483,7 @@ export function buildTree(s: RenderSettings, d: RenderSettings): DebugNode[] {
         "markerXRadius",
         d.nukeTrajectory,
         2,
-        16,
+        64,
         1,
         "X Marker (px)",
       ),

src/client/render/gl/render-settings.json

@@ -242,7 +242,7 @@
     "interceptOutlineG": 0.353,
     "interceptOutlineB": 0.353,
     "markerCircleRadius": 6,
-    "markerXRadius": 8
+    "markerXRadius": 40
   },
   "nukeTelegraph": {
     "strokeWidth": 1.5,