ESLint --fix: auto-fix brace-style, indent, semi, no-trailing-spaces

Run eslint --fix across src/ to clear ~1900 mechanical lint errors
surfaced by the @typescript-eslint v8 + react-hooks v7 + react-compiler
upgrade in the React 19 modernization PR.

Issues fixed automatically:
- brace-style (Allman): try/catch one-liners reformatted to multi-line
- indent: tab-vs-space and depth corrections
- semi: missing trailing semicolons
- no-trailing-spaces

No semantic changes. Remaining 701 errors are real-code issues
(set-state-in-effect, rules-of-hooks, no-unsafe-* type checks) that
need manual per-file review.

https://claude.ai/code/session_01GrR87LAqnAEyKG2ZbmQt5Q

src/components/avatar-effects/AvatarEffectsView.tsx

@@ -36,8 +36,8 @@ export const AvatarEffectsView: FC<{}> = () =>
 
                 switch(parts[1])
                 {
-                    case 'show':   setIsVisible(true); return;
-                    case 'hide':   setIsVisible(false); return;
+                    case 'show': setIsVisible(true); return;
+                    case 'hide': setIsVisible(false); return;
                     case 'toggle': setIsVisible(prev => !prev); return;
                 }
             },
@@ -83,7 +83,10 @@ export const AvatarEffectsView: FC<{}> = () =>
             }
         })();
 
-        return () => { cancelled = true; };
+        return () =>
+        {
+            cancelled = true;
+        };
     }, [ isVisible, effects.length, loadError ]);
 
     const session = GetSessionDataManager();