Phase C (targeted): clear 4 set-state-in-effect violations on safe candidates

Fix only the cases that are unambiguous anti-patterns; leave the
event-driven setState patterns (useNitroEvent / useMessageEvent
subscriptions, async fetches with cleanup) alone since they're
legitimate in this architecture.

- src/components/catalog/views/catalog-header/CatalogHeaderView.tsx:
  displayImageUrl was pure-derived from imageUrl. Drop the useState +
  useEffect entirely; compute in render.
- src/components/navigator/views/NavigatorRoomCreatorView.tsx:
  the maxVisitors list (10..100 step 10) and roomModels/selectedModel
  came from static config; convert to module-level MAX_VISITORS_LIST
  constant + useState lazy initializers. Removes 2 init effects.
  setCategory(categories[0].id) is left as-is because categories
  arrives async from a hook.
- src/components/login/LoginView.tsx:
  Replace useEffect(() => setLocalError(null), [step]) with the
  React-recommended "track previous prop" render-time reset:
  if(prevStep !== step) { setPrevStep(step); setLocalError(null); }
  Same observable behavior, no extra render.
- src/components/room/widgets/choosers/ChooserWidgetView.tsx:
  Wrap the selectItem callback prop call in useEffectEvent so a
  parent re-render that changes selectItem identity doesn't
  re-fire the visualizer side-effects.

Net: 4 fewer set-state-in-effect violations; behavior preserved.
The remaining ~328 violations across the codebase are predominantly
legitimate event-bus / async-fetch patterns and need per-case
review with running app, not a sweep.

https://claude.ai/code/session_01GrR87LAqnAEyKG2ZbmQt5Q

src/components/catalog/views/catalog-header/CatalogHeaderView.tsx

@@ -1,4 +1,4 @@
-import { FC, useEffect, useState } from 'react';
+import { FC } from 'react';
 import { GetConfigurationValue } from '../../../../api';
 
 export interface CatalogHeaderViewProps
@@ -9,12 +9,7 @@ export interface CatalogHeaderViewProps
 export const CatalogHeaderView: FC<CatalogHeaderViewProps> = props =>
 {
     const { imageUrl = null } = props;
-    const [ displayImageUrl, setDisplayImageUrl ] = useState('');
-
-    useEffect(() =>
-    {
-        setDisplayImageUrl(imageUrl ?? GetConfigurationValue<string>('catalog.asset.image.url').replace('%name%', 'catalog_header_roombuilder'));
-    }, [ imageUrl ]);
+    const displayImageUrl = imageUrl ?? GetConfigurationValue<string>('catalog.asset.image.url').replace('%name%', 'catalog_header_roombuilder');
 
     return <div className="flex justify-center items-center w-full nitro-catalog-header">
         <img src={ displayImageUrl } onError={ ({ currentTarget }) =>