Fix Clippy Warnings and Update Rust Dependencies for Compatibility

[PtPrashantTripathi]

Summary

This PR focuses on addressing all Rust-side issues flagged by Clippy and compiler warnings, along with essential dependency upgrades to maintain compatibility with the latest stable Rust (1.88+). These changes are required for code health, stability, and long-term maintainability.

Key Changes

Clippy Fixes

Resolved Clippy warnings with cargo clippy --all-targets --all-features -- -D warnings including:

• Replaced legacy numeric constants:

  • std::u8::MAX → u8::MAX
  • Removed outdated imports like use std::u8::MAX;

• Fixed uninlined format arguments:

  • Rewrote format! and println! calls using named arguments like:

    println!("{name}")  // instead of println("{}", name)

• Updated unsafe pointer comparison:

  • Replaced ptr as *const T != end with !std::ptr::eq(ptr, end)

Dependency Upgrades

• wasm-bindgen: 0.2.84 → 0.2.100
• syn: 1.0.x → 2.0.12
• rustversion: added (1.0.21) to support newer wasm-bindgen
• Updated Cargo.lock to reflect these changes

These upgrades are required due to breaking changes in recent Rust releases, where older versions of wasm-bindgen were incompatible with Rust 1.88+.

Code Enhancements

• Added impl Default for Aadhaar for ergonomic default construction
• Ensured lifetime annotations in Result<Sourcecode> were properly corrected:
  Result<'sc> → Result<Sourcecode<'sc>>

How to Test

1. Run cargo build --release → ✅ should build cleanly
2. Run cargo clippy --all-targets --all-features -- -D warnings → ✅ zero warnings
3. Run tests: cargo test --all

Notes

• This PR builds on top of the pre-commit, CLI, and formatting enhancements from the prior PR.
• The project now supports latest Rust toolchain cleanly with no deprecated usage.

[PtPrashantTripathi]

Hey @Takshil-Kunadia 👋 — before I deploy, just checking if you'd like to do any final testing.

I noticed a \u200B (zero-width space) that might’ve been unintentionally left from when I was coding on Windows — I’ve removed it now. Also included a few other cleanup changes on top of your last patch.

Let me know if you want to take a quick look or run any additional tests before I ship it 🚀

[Takshil-Kunadia]

Had a look anyways, LGTM ✅ 🚀