feat(graphics): add max preset (no chunk streaming, LOD@50m)

Restore ultra to its original behaviour (50m chunk streaming, HD within
20m, no fog) and introduce a new max preset that disables chunk streaming
entirely (loads all chunks unconditionally) and pushes the HD/LOD swap
distance to 50m. Add chunkStreamingEnabled flag to GraphicsPresetConfig
so the streaming gate honours the preset. The settings card label shows
'All' when streaming is off.

src/components/ui/GameSettingsMenu.tsx

@@ -105,6 +105,9 @@ function GraphicsPresetButton({
   const lodLabel = config.forceLodModels
     ? "LOD forcé"
     : `HD ${config.lodHighDetailDistance}m`;
+  const chunkLabel = config.chunkStreamingEnabled
+    ? formatChunkDistance(config.chunkLoadRadius)
+    : "All";
 
   return (
     <button
@@ -115,8 +118,7 @@ function GraphicsPresetButton({
     >
       <span>{config.label}</span>
       <small>
-        {formatChunkDistance(config.chunkLoadRadius)} · {lodLabel} ·{" "}
-        {config.fogEnabled ? "Fog" : "Clear"}
+        {chunkLabel} · {lodLabel} · {config.fogEnabled ? "Fog" : "Clear"}
       </small>
     </button>
   );

src/data/world/graphicsConfig.ts

@@ -1,9 +1,16 @@
-export const GRAPHICS_PRESET_KEYS = ["low", "medium", "high", "ultra"] as const;
+export const GRAPHICS_PRESET_KEYS = [
+  "low",
+  "medium",
+  "high",
+  "ultra",
+  "max",
+] as const;
 
 export type GraphicsPreset = (typeof GRAPHICS_PRESET_KEYS)[number];
 
 export interface GraphicsPresetConfig {
   chunkLoadRadius: number;
+  chunkStreamingEnabled: boolean;
   chunkUnloadRadius: number;
   fogEnabled: boolean;
   forceLodModels: boolean;
@@ -16,6 +23,7 @@ export const GRAPHICS_PRESETS = {
     label: "Basse",
     chunkLoadRadius: 10,
     chunkUnloadRadius: 18,
+    chunkStreamingEnabled: true,
     fogEnabled: true,
     forceLodModels: true,
     lodHighDetailDistance: 0,
@@ -24,6 +32,7 @@ export const GRAPHICS_PRESETS = {
     label: "Moyenne",
     chunkLoadRadius: 20,
     chunkUnloadRadius: 30,
+    chunkStreamingEnabled: true,
     fogEnabled: true,
     forceLodModels: true,
     lodHighDetailDistance: 0,
@@ -32,6 +41,7 @@ export const GRAPHICS_PRESETS = {
     label: "High",
     chunkLoadRadius: 35,
     chunkUnloadRadius: 45,
+    chunkStreamingEnabled: true,
     fogEnabled: false,
     forceLodModels: false,
     lodHighDetailDistance: 10,
@@ -40,10 +50,20 @@ export const GRAPHICS_PRESETS = {
     label: "Ultra",
     chunkLoadRadius: 50,
     chunkUnloadRadius: 65,
+    chunkStreamingEnabled: true,
     fogEnabled: false,
     forceLodModels: false,
     lodHighDetailDistance: 20,
   },
+  max: {
+    label: "Max",
+    chunkLoadRadius: 50,
+    chunkUnloadRadius: 65,
+    chunkStreamingEnabled: false,
+    fogEnabled: false,
+    forceLodModels: false,
+    lodHighDetailDistance: 50,
+  },
 } as const satisfies Record<GraphicsPreset, GraphicsPresetConfig>;
 
 export const GRAPHICS_DEFAULTS = {

src/world/map-instancing/MapInstancingSystem.tsx

@@ -149,6 +149,7 @@ export function MapInstancingSystem({
   const streamingEnabled =
     streaming &&
     CHUNK_CONFIG.enabled &&
+    graphicsPresetConfig.chunkStreamingEnabled &&
     sceneMode === "game" &&
     cameraMode === "player";
 

src/world/vegetation/VegetationSystem.tsx

@@ -83,6 +83,7 @@ export function VegetationSystem({
   const streamingEnabled =
     streaming &&
     CHUNK_CONFIG.enabled &&
+    graphicsPreset.chunkStreamingEnabled &&
     sceneMode === "game" &&
     cameraMode === "player";