fix(drive): guard against max_elements=0 in encrypted notes verification

[QuantumExplorer]

Issue being fixed or feature implemented

When max_elements=0 is passed to verify_shielded_encrypted_notes, limit becomes 0 and start_index + limit - 1 underflows (u64 wrapping subtraction), producing an incorrect range query.

What was done?

Added an early error return when max_elements == 0. Also simplified the chunk alignment check since chunk_size > 0 is now guaranteed.

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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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/encrypted-notes-zero-max-elements

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[github-actions]

✅ DashSDKFFI.xcframework built for this PR.

• Workflow run: https://github.com/dashpay/platform/actions/runs/22760172483
• 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: "1ea492de820aea654f2e58fb319c6691185b37cacba2f7ec8531ee75d04853a1"
)

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.