Add Graphics Settings modal with live name-label tuning (#4065)

## Description:

- Add a user-facing **Graphics Settings** modal accessible from the
in-game Settings menu, with live preview as sliders change.
- First two knobs: **Name Scale** and **Minimum Name Size** (the
name-cull threshold).
- Overrides stored as a single JSON blob in `localStorage` under
`settings.graphics`, validated by a Zod schema
(`GraphicsOverridesSchema`). Future graphics knobs just extend the
schema + slider list.

## How it fits together

- `generateRenderSettings(overrides)` (`RenderSettings.ts`) — pure
function: clones `render-settings.json` defaults, layers overrides on
top, returns a fresh `RenderSettings`.
- `UserSettings.graphicsOverrides()` / `setGraphicsOverrides()` —
read/write the blob; falls back to `{}` on a missing/corrupt entry.
- `ClientGameRunner` listens for
`USER_SETTINGS_CHANGED_EVENT:settings.graphics`, regenerates, and
`Object.assign`s each category into the live `view.getSettings()` slice
so passes pick up the new values on the next frame (no renderer
reconstruction).
- Modal reads defaults straight from `render-settings.json` so there's
no duplication.


<img width="599" height="515" alt="Screenshot 2026-05-28 at 11 18 43 AM"
src="https://github.com/user-attachments/assets/263d7d91-10d8-4a66-a069-10015c735d60"
/>

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

## Please put your Discord username so you can be contacted if a bug or
regression is found:

evan

src/client/render/gl/GraphicsOverrides.ts

@@ -0,0 +1,14 @@
+import { z } from "zod";
+
+export const GraphicsOverridesSchema = z
+  .object({
+    name: z
+      .object({
+        nameScaleFactor: z.number(),
+        cullThreshold: z.number(),
+      })
+      .partial(),
+  })
+  .partial();
+
+export type GraphicsOverrides = z.infer<typeof GraphicsOverridesSchema>;

src/client/render/gl/RenderSettings.ts

@@ -1,3 +1,4 @@
+import { GraphicsOverrides } from "./GraphicsOverrides";
 import defaults from "./render-settings.json";
 
 export interface RenderSettings {
@@ -260,6 +261,23 @@ export function createRenderSettings(): RenderSettings {
   return JSON.parse(JSON.stringify(defaults)) as RenderSettings;
 }
 
+/**
+ * Generate a fresh RenderSettings by layering user overrides on top of the
+ * render-settings.json defaults. Pure — does not mutate any input.
+ */
+export function generateRenderSettings(
+  overrides: GraphicsOverrides,
+): RenderSettings {
+  const settings = createRenderSettings();
+  if (overrides.name?.nameScaleFactor !== undefined) {
+    settings.name.nameScaleFactor = overrides.name.nameScaleFactor;
+  }
+  if (overrides.name?.cullThreshold !== undefined) {
+    settings.name.cullThreshold = overrides.name.cullThreshold;
+  }
+  return settings;
+}
+
 /** Dump current settings to a downloadable JSON file. */
 export function dumpSettings(settings: RenderSettings): void {
   const json = JSON.stringify(settings, null, 2);

src/client/render/gl/index.ts

@@ -9,8 +9,14 @@ export type {
   RadialMenuSelectEvent,
 } from "./Events";
 export { GameView } from "./GameView";
+export { GraphicsOverridesSchema } from "./GraphicsOverrides";
+export type { GraphicsOverrides } from "./GraphicsOverrides";
 export type { SpawnCenter } from "./passes/SpawnOverlayPass";
-export { createRenderSettings, dumpSettings } from "./RenderSettings";
+export {
+  createRenderSettings,
+  dumpSettings,
+  generateRenderSettings,
+} from "./RenderSettings";
 export type { RenderSettings } from "./RenderSettings";
 export { deepAssign, deepDiff } from "./SettingsUtils";
 export { buildTerrainRGBA, getPaletteSize } from "./utils/ColorUtils";