chore: adjusting the setup

[m1s0g1]

Description

Summary

• What: Adds comprehensive shipment input validation and per-shipment token_address; updates escrow ops/events to use each shipment's token.
• Issues: Closes [CONTRACT] Implement comprehensive shipment input validation #226, [CONTRACT] Add token address field to shipment struct #330, [CONTRACT] Update escrow operations to use per-shipment token addresses #331, [CONTRACT] Implement Multi-Token Escrow Support #142

What Changed

• Validation: Payment-milestone rules, deadlines, participant checks, token validation.
• Token: token_address added to ShipmentInput/Shipment and persisted per-shipment.
• Escrow: deposit/release/refund and events use shipment token_address.
• Errors: New validation NavinError variants + messages.
• Tests: Core validation tests updated; rest of suite requires fixture updates.

Files

• Edited: validation.rs, lib.rs, error_map.rs, events.rs, storage.rs

Breaking Changes

• API: ShipmentInput/Shipment now include token_address — callers and tests must supply it.
• Events: Escrow event payloads include token_address.

Testing

cargo test -p shipment
cargo clippy -p shipment --all-targets --all-features -- -D warnings
cargo build --target wasm32-unknown-unknown --release -p shipment

Checklist

• Validation implemented: Yes
• Per-shipment token persisted: Yes
• Escrow ops updated: Yes
• Validation tests updated: Partially (core done)
• Full test-suite updated: No (needs bulk fixture edits)

Closes #142
Closes #226
Closes #330
Closes #331

[dinahmaccodes]

please finish up your PR @m1s0g1

[m1s0g1]

finishing pr today

[dinahmaccodes]

complete your pr

[m1s0g1]

yes ma
sorry for the delay

[m1s0g1]

fixing the bugs