Feature: option to turn off automatic tank model loading

Lets people on limited data stop the Tankopedia from downloading 3D models automatically.

- Added an Automatically load 3D models switch to the settings page, on by default
- When off, the tank page hero shows a Load 3D model button where the loading bar sits
- Held back every model download on the tank page until requested, including the dynamic armor switcher and the gun flexibility visualizer
- Wrapped the tank sandbox in its own suspense boundary so the loading bar shows real progress instead of the whole page waiting on the model
- Measured loading progress from when each loading bar appears so it always starts empty
- Added the English strings; other languages fall back until translated

Fixes #311

packages/website/src/pages/[...chunk_default]/[...locale]/settings/_index.tsx

@@ -18,6 +18,10 @@ export function Page({ locale }: LocaleAcceptorProps) {
 
 function Content({ locale }: LocaleAcceptorProps) {
   const developerMode = App.useDeferred((state) => state.developerMode, false);
+  const autoLoadModels = App.useDeferred(
+    (state) => state.autoLoadModels,
+    true,
+  );
   const { strings } = useLocale();
 
   return (
@@ -36,6 +40,19 @@ function Content({ locale }: LocaleAcceptorProps) {
           />
         </Flex>
 
+        <Flex align="center" gap="2" justify="between">
+          <Text>{strings.website.settings.auto_load_models}</Text>
+          <Switch
+            variant="classic"
+            checked={autoLoadModels}
+            onCheckedChange={(checked) =>
+              App.mutate((draft) => {
+                draft.autoLoadModels = checked;
+              })
+            }
+          />
+        </Flex>
+
         <Flex align="center" gap="2" justify="between">
           <Text>{strings.website.settings.language}</Text>
           <LocaleSwitcher locale={locale} />