refactor: preserve typed SdkError in TaskError variants for duplicate-key errors

[Copilot]

• Add source_error: String field to typed TaskError variants (previous iteration)
• Change source_error from String to Box<dash_sdk::Error> (typed API error) with #[source] for proper error chaining
• Change broadcast_error to take SdkError by value; borrow &error in a block to classify the consensus kind, then move into the boxed variant
• Update call site: .map_err(|ref e| broadcast_error(e)) → .map_err(broadcast_error)
• Update all 5 unit tests to pass sdk_err by value
• Fix cargo fmt failures: correct import order in error.rs and match arm/assert formatting in add_key_to_identity.rs

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[lklimek]

@copilot what's your progress

[Copilot]

@copilot what's your progress

The work is complete. The reviewer's suggestion was already fully addressed in the base branch by commits 6da02fc (added exact equality check) and ec5e11d (switched to Encoding::Base58 in both production code and the test). No additional code changes were needed in this PR.

[lklimek]

@copilot did you check the code rabbit comment with "Keep the raw SdkError visible when mapping to typed variants".

[Copilot]

@copilot did you check the code rabbit comment with "Keep the raw SdkError visible when mapping to typed variants".

Yes, addressed in 1106f0e. Added tracing::warn!("AddKeyToIdentity broadcast failed: {:?}", error); at the top of broadcast_error() so the full raw SdkError is logged before it gets mapped into a coarse typed TaskError variant.

[lklimek]

@copilot we want it to be included into the task error, add field to a variant or new variant

[Copilot]

@copilot we want it to be included into the task error, add field to a variant or new variant

Done in 8210e4f. Added source_error: String field (populated with format!("{:?}", error)) to all three variants — DuplicateIdentityPublicKey, DuplicateIdentityPublicKeyId, and IdentityPublicKeyContractBoundsConflict. The raw SdkError is now embedded in the variant itself and visible via Debug, and the intermediate tracing::warn! log was removed since the context is now preserved in the error.

[lklimek]

@copilot clippy job failed (cargo fmt)

[Copilot]

@copilot clippy job failed (cargo fmt)

Fixed in 15f2941. Two rustfmt issues: import order (SdkError before dashcore_rpc) in error.rs, and match arm / matches! macro formatting in add_key_to_identity.rs.