feat(ffi): upload progress on wallet path + distinct timeout/disk-space errors

[Nic-dorman]

FFI-only mobile error-handling + progress improvements for the next AntFfi 0.0.8 release. No ant-core bump — still ant-core 0.3.1 (ant-cli-v0.2.11), so nothing on the payment/security surface moves.

Changes

Ticket	Change
V2-597	Add fileUploadPublicWithProgress / fileUploadPrivateWithProgress — the wallet-backed (built-in payment) counterparts of fileUploadPublic/Private. They bridge ant-core's file_upload_with_progress UploadEvents to the existing ProgressListener (encrypting/quoting/storing phases). The external-signer path already had progress via prepare/finalize_*_with_progress; this closes the gap on the wallet path.
V2-599	fileDownloadPublic no longer flattens every ant-core error into NetworkError. It now propagates through the From<ant_core::data::Error> mapping, so a timeout / out-of-disk failure surfaces as its own variant instead of a misleading "network error".
V2-600	Map ant-core Error::InsufficientDiskSpace → new ClientError::InsufficientDiskSpace (previously swallowed by the catch-all InternalError).
V2-601 (timeout half)	Error::Timeout now maps to a dedicated ClientError::Timeout variant instead of being folded into NetworkError with a "timeout:" prefix.

Out of scope (need upstream ant-client work)

• V2-601 insufficient-funds half — ant-core wraps low balance in a generic Payment(String) with no distinct variant. Needs a core InsufficientFunds variant; V2-601 stays open for it.
• V2-598 cancellation — no CancellationToken on core's data upload/download path (only implicit receiver-drop). Rescoped to a download-only investigation.

Verification

• cargo fmt --all + cargo clippy --all-targets --all-features -D warnings clean
• cargo test --all — 8 passed
• Regenerated Swift + Kotlin bindings and confirmed both expose fileUploadPublicWithProgress/fileUploadPrivateWithProgress and the Timeout / InsufficientDiskSpace error variants.

Additive uniffi enum change (new variants), so bindings and Rust stay in lockstep per-release; consumers pick it up on the 0.0.8 rebuild.

🤖 Generated with Claude Code

[Nic-dorman]

Both in-scope misses from the release review addressed in 64469ed (branch also rebased onto current main):

• wait_for_receipt timeout now returns ClientError::Timeout instead of NetworkError — the most user-visible timeout in the WalletConnect external-signer flow now carries the variant this PR introduced.
• Download ENOSPC: core Io(StorageFull) from download file writes now maps to ClientError::InsufficientDiskSpace instead of InternalError (guard arm on the From impl; other Io kinds still fall through).
• Corrected the missing-record mapping note (missing records surface as core InvalidData → FFI InvalidInput at the 0.3.1 pin, not Network; the NotFound arm arrives with the 0.4.x pin bump now that fix(core): type absent records as Error::NotFound (was InvalidData) ant-client#153 is merged).
• Added From-mapping unit tests (StorageFull → InsufficientDiskSpace, other Io → InternalError, Timeout → Timeout).

Gates on 64469ed: fmt + clippy -D warnings clean, 11/11 tests. No interface change (no new variants), so no binding regeneration needed.

Holding merge pending Nic's go-ahead.