fix(drive): correct tree types in shielded pool estimated costs

[QuantumExplorer]

Issue being fixed or feature implemented

The fee estimation for the shielded pool used incorrect tree types, causing inaccurate cost calculations.

What was done?

• Nullifiers tree: NormalTree → ProvableCountTree to match empty_provable_count_tree() used in initialization
• Pool children weights: count_trees_weight: 1 for nullifiers, non_sum_trees_weight: 1 for anchors only (was count_trees_weight: 0, non_sum_trees_weight: 2)

How Has This Been Tested?

• cargo check -p drive — compiles cleanly

Breaking Changes

None.

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have added "!" to the title and described breaking changes in the corresponding section if my code contains any
• I have made corresponding changes to the documentation if needed

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[github-actions]

✅ DashSDKFFI.xcframework built for this PR.

• Workflow run: https://github.com/dashpay/platform/actions/runs/22760052288
• Artifacts: DashSDKFFI.xcframework (folder), DashSDKFFI.xcframework.zip, xc_checksum.txt

SwiftPM (host the zip at a stable URL, then use):

.binaryTarget(
  name: "DashSDKFFI",
  url: "https://your.cdn.example/DashSDKFFI.xcframework.zip",
  checksum: "efe60dabfe9332552ceae7753cb860416aa7bcf48a95c040909dc82739130197"
)

Xcode manual integration:

• Download 'DashSDKFFI.xcframework' artifact from the run link above.
• Drag it into your app target (Frameworks, Libraries & Embedded Content) and set Embed & Sign.
• If using the Swift wrapper package, point its binaryTarget to the xcframework location or add the package and place the xcframework at the expected path.