Add Graphics Settings name color toggle and unit tests

Adds a single "Name color" toggle (Colored / Black) to the Graphics
Settings modal, backed by a `darkNames` boolean in the override schema
that derives the five underlying name-rendering fields
(fill/outline player-color flags + static outline RGB). Forcing the
outline RGB to 0 in dark mode is what makes the shader's defaultFill
ramp actually render black — flipping the boolean uniforms alone
wasn't enough because the fill is derived from uOutlineColor when
fillUsePlayerColor is false.

Flips the render-settings.json defaults so black names are the
renderer baseline; the modal's no-override state follows the JSON
source of truth. Adds tests covering schema parse behavior and the
generateRenderSettings derivation for each override field.

resources/lang/en.json

@@ -923,6 +923,10 @@
     "name_scale_label": "Name Scale",
     "name_cull_label": "Minimum name size",
     "name_cull_desc": "Hide names smaller than this size",
+    "colored_names_label": "Name color",
+    "colored_names_desc": "Show player names in their player color or in black",
+    "colored": "Colored",
+    "black": "Black",
     "reset_label": "Reset to defaults",
     "reset_desc": "Clear all graphics overrides"
   },