Tweak render settings to look more like v31

Lower territory saturation, highlight thickness, and border darkening
to bring the rendered map closer to the v31 look.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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

@@ -70,7 +70,7 @@
     "trailAlpha": 0.588,
     "defenseCheckerDarken": 0.7,
     "territoryDefenseDarken": 0.85,
-    "territorySaturation": 1,
+    "territorySaturation": 0.85,
     "territoryAlpha": 0.588,
     "coordinateGridOpacity": 0.5,
     "staleNukeBase": 0,
@@ -81,7 +81,7 @@
     "staleNukeB": 0.07,
     "highlightBrighten": 0.25,
     "highlightFillBrighten": 0.15,
-    "highlightThicken": 2,
+    "highlightThicken": 1,
     "defensePostRange": 30,
     "embargoTintRatio": 0.35,
     "friendlyTintRatio": 0.35,
@@ -148,7 +148,7 @@
     "highlightOutlineWidth": 0.04,
     "highlightDimAlpha": 0.3,
     "fillDarken": 0.65,
-    "borderDarken": 0.35,
+    "borderDarken": 0.1,
     "iconAlpha": 1.0,
     "iconR": 1.0,
     "iconG": 1.0,