Add PowerShell colorization for dir and command line syntax

[Copilot]

Implements color output for PowerShell dir command following .dircolors mappings, and minimal command-line syntax highlighting (variables and parameters only).

Changes

• Custom dir function: Overrides built-in alias to colorize output based on file type

  • Directories (cyan), text/source files (green), media (yellow), documents (red), archives (magenta), executables (red)
  • Maps ANSI codes from .dircolors to PowerShell console colors
  • Handles Unix executable permissions and Windows file extensions

• PSReadLine configuration: Highlights variables ($var) and parameters (-param) in green

• Compatibility: OS detection works across PowerShell 5.1+ (pre-Core and Core)

Example

# In /tmp/test_dir with mixed file types
PS> dir

subdir          # Cyan
README.md       # Green
test.py         # Green
test.jpg        # Yellow
test.zip        # Magenta
test.exe        # Red

Command-line editing will show $myVariable and -Path in green during interactive use.

Original prompt

Implement a minimal PowerShell color for:

• dir command, following colors in .dircolors
• command line, where the only highlights should be green for variables and parameters

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