Refactor install_dependencies to use bash array

[arkamar]

Use a bash array for the package list instead of a plain string to avoid word-splitting issues. Also sort packages alphabetically and move apt update before apt install for clarity.

[cursor]

PR Summary

Low Risk
Low risk refactor limited to build.sh dependency installation; behavior should be unchanged aside from safer argument handling and clearer ordering.

Overview
Refactors build.sh install_dependencies to build the apt package list as a bash array (including conditional gcc-aarch64-linux-gnu for cross-builds) and installs via apt install -y "${packages[@]}" to avoid word-splitting.

Also reorders the steps to run apt update immediately before apt install and normalizes the package list ordering for readability.

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