UI/UX improvements

[bbyalcinkaya]

This PR bundles several user-facing improvements:

• Fix: Display Rust test contract names in the progress bar. Previously only .<method-name> was shown. Rust tests now follow the same <contract>.<method> format as Solidity for clearer feedback.
• Fix: Correct fuzz/test run time measurement in the progress bar. Previously, initialization time was incorrectly attributed to the first fuzz run.
• Improve the skribe build command by using cargo stylus build instead of manually passing build arguments to cargo, making builds more robust and aligned with the standard Stylus toolchain.