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/api/room/widgets/AvatarInfoUtilities.ts

@@ -190,7 +190,7 @@ export class AvatarInfoUtilities
         userInfo.prefixEffect = userData.prefixEffect;
         userInfo.prefixFont = userData.prefixFont;
         userInfo.displayOrder = userData.displayOrder;
-		userInfo.backgroundId = userData.background;
+        userInfo.backgroundId = userData.background;
         userInfo.standId = userData.stand;
         userInfo.overlayId = userData.overlay;
         userInfo.cardBackgroundId = userData.cardBackground ?? 0;