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

index.html

@@ -341,6 +341,7 @@
       <replay-panel></replay-panel>
     </div>
     <settings-modal></settings-modal>
+    <graphics-settings-modal></graphics-settings-modal>
     <player-panel></player-panel>
     <spawn-timer></spawn-timer>
     <immunity-timer></immunity-timer>