refactor(script): improve readability of encoding flow

Expand compact shell conditionals into explicit if blocks throughout
config loading, codec parsing, cleanup, and file-list handling. Rename
short local variables in encode_one to more descriptive names, including
the input file, temporary output path, command array, and progress
counters.

Also align preset-list output with the shared msg helper and update
colors for preset names.

This makes the main transcoding path easier to read and maintain without
changing the intended encoding behaviour.

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