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/components/read-receipt-avatars/ReadReceiptAvatars.tsx

@@ -114,7 +114,7 @@ export function ReadReceiptAvatars({
           })}
           {extra > 0 && (
             <Text
-              size="T100"
+              size="T200"
               style={{ paddingLeft: '4px', color: color.SurfaceVariant.OnContainer }}
             >
               +{extra}