[Richkid2]

Closes #640

Adds direct tests for src/utils/sorobanConverter.ts and
src/utils/contractArgsBuilder.ts:

• every supported type (address, u32/i32/u64/i64/u128/i128, symbol, string,
  bool, bytes, vec, map) with boundary values: i128 min/max, values beyond
  Number.MAX_SAFE_INTEGER, empty bytes, 32/33-char symbols
• toScVal -> fromScVal round trips
• rejection of unsupported input with clear errors
• argument order, count and ScVal types for each builder

Known bugs are documented with it.fails (they pass while the bug exists and
fail once it is fixed, at which point they should become it):

• objectToScValMap does not sort keys (Soroban host requires sorted maps)
• toScVal(Uint8Array) is inferred as a map, not bytes
• 64/128-bit converters silently coerce null/true/""/[] and floor fractions
• i128 from a decimal string loses precision past 2^53
• bytesToScVal accepts strings

Note: tests were written without a local run; please check CI.
#640

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