chore: upgrade TypeScript 4.9 to 5.9, ESLint 8.29 to 8.57, @typescript-eslint 5 to 7

Resolves all TS2345/TS2347/TS7006 type errors introduced by stricter TypeScript 5.x.
Fix Icons.Settings to Icons.Setting, cast account data returns, fix implicit any.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/features/room/RoomInput.tsx

@@ -814,7 +814,7 @@ export const RoomInput = forwardRef<HTMLDivElement, RoomInputProps>(
               )}
               {gifError && (
                 <Text
-                  size="T100"
+                  size="T200"
                   style={{
                     color: 'var(--tc-danger-normal)',
                     padding: '2px 6px',