Replace "any" return type in xdr-parser.ts with strict types

[Code-Paragon]

Problem

The parseSorobanResult function in src/utils/xdr-parser.ts currently returns any, which violates the CONTRIBUTING.md guideline to avoid any types and removes TS safety for downstream functions.

Expected behavior

The function returns a strongly typed union (e.g., string | number | boolean | Record<string, unknown>) based on what scValToNative can output, ensuring type safety.

Files to update

• src/utils/xdr-parser.ts

Project relevance

This strictly adheres to the project's technical guidelines and ensures mathematical and state-reading operations remain type-safe.

Acceptance criteria

• Feature works as described
• Tests are added or updated where needed
• Documentation is updated where needed
• any return type is completely removed and replaced with a strict TypeScript union type
• No TypeScript, lint, test, or build errors