fix(dash-spv-ffi): encode the truncated wallet id with hex-conservative

[PastaPastaPasta]

dev doesn't compile dash-spv-ffi. #1104 added two hex::encode(wallet_id) calls in the chain-truncated callback (dash-spv-ffi/src/callbacks.rs), but #1115, merged just before it, had moved the workspace off the hex crate. Each was green on its own base. Together they fail with error[E0433]: cannot find module or crate 'hex', which fails the ffi, ASan and other jobs on every open PR.

The two calls now use DisplayHex::to_lower_hex_string(), which the same file already imports and uses for the swept-transactions warning just above. The output is the same lowercase hex.

Tests

• cargo clippy --workspace --all-targets --all-features -- -D warnings passes on this branch.
• cargo fmt --check passes.

Breaking changes

None.

🤖 Generated with Claude Code

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📥 Commits

Reviewing files that changed from the base of the PR and between 04359e5 and 91339e5.

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• dash-spv-ffi/src/callbacks.rs

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.31%. Comparing base (04359e5) to head (91339e5).

Files with missing lines	Patch %	Lines
dash-spv-ffi/src/callbacks.rs	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1153      +/-   ##
==========================================
- Coverage   82.50%   78.31%   -4.19%     
==========================================
  Files         268      298      +30     
  Lines       68852    79480   +10628     
==========================================
+ Hits        56807    62247    +5440     
- Misses      12045    17233    +5188     

Flag	Coverage Δ
core	76.44% <ø> (ø)
ffi	51.19% <0.00%> (?)
rpc	49.36% <ø> (ø)
spv	92.47% <ø> (-0.01%)	⬇️
wallet	82.07% <ø> (ø)

Files with missing lines	Coverage Δ
dash-spv-ffi/src/callbacks.rs	82.09% <0.00%> (ø)

... and 37 files with indirect coverage changes