Apply ANSI colors to synopsis/Usage line

[stalep]

Summary

The Options section in help output has ANSI color styling (yellow for option names, cyan for value placeholders), but the synopsis/Usage line is plain text with no colors.

Current output

Usage: jbang run [-hinx] [-R=<runtime-option>] [--jfr] [-d=<debug>]
                  [--enableassertions] [--enablesystemassertions]
                  ...

No colors in the synopsis line, even though the Options section below uses yellow/cyan.

Expected

Apply the same color scheme to the synopsis line:

• Yellow for option/flag names ([-hinx], [--jfr], [--enableassertions])
• Cyan for value placeholders (<runtime-option>, <debug>, <scriptOrFile>)
• Bold for the command name (jbang run)

This would match picocli's behavior where the synopsis had the same styling as the options list, making it easier to visually parse the dense synopsis line.

Context

Found in jbang (jbangdev/jbang#2453). The options section already has colors (#454), but the synopsis does not.

[stalep]

Fixed in commit dbec493. The synopsis/Usage line now has the same ANSI color scheme as the options section:

• Bold command name (Usage: **jbang run**)
• Yellow option names ([--verbose], [-hinx])
• Cyan value placeholders (=<config>, <key>=<value>)

Synopsis wrapping (wrapSynopsis) now uses visual length (excluding ANSI escapes) for line width calculation, so wrapping is correct at 80 columns regardless of ANSI codes.

Added ProcessedOption.isAnsiMode() getter so buildDetailedSynopsis can check the mode. All styling is disabled when ansiMode=false.