DanGould / rust-payjoin / 22572305960

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Expose PSBT input error index in FFI

Add an `index()` getter to `PsbtInputsError` and an
`input_index()` method on the core `BuildSenderError` so
the FFI layer can extract the zero-based position of the
offending PSBT input.

The FFI `BuildSenderError` now carries an `input_index`
field (exposed via uniffi) that is populated from the core
error during conversion. This lets Swift, Kotlin, Python,
and other FFI consumers surface precise diagnostics about
which input failed validation.

Six new tests verify propagation at the core psbt, core
send, and FFI layers.

Closes #1276

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