fix: Windows evaluating text on copy

[Hona]

What does this PR do?

Fixes #8166

copying text like

on windows would expand these variables because it uses powershell

changes to use stdin - the same as linux clipboard

I found a duplicate PR - however mine stays consistent with linux
#8150

How did you verify your code works?

copying the same text on latest release and my branch on windows

[github-actions]

Thanks for your contribution!

This PR doesn't have a linked issue. All PRs must reference an existing issue.

Please:

1. Open an issue describing the bug/feature (if one doesn't exist)
2. Add Fixes #<number> or Closes #<number> to this PR description

See CONTRIBUTING.md for details.

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Based on my search, I found 3 potentially related PRs that deal with Windows/WSL clipboard functionality:

1. PR fix(tui): support clipboard image paste with proper filename on WSL2 #8209: fix(tui): support clipboard image paste with proper filename on WSL2

   • fix(tui): support clipboard image paste with proper filename on WSL2 #8209
   • Related: Addresses clipboard handling on Windows/WSL2

2. PR fix(tui): fix Ctrl+V paste on Windows/WSL2 (#6560 and #8209) #8626: fix(tui): fix Ctrl+V paste on Windows/WSL2 (#6560 and #8209)

   • fix(tui): fix Ctrl+V paste on Windows/WSL2 (#6560 and #8209) #8626
   • Related: Fixes paste operations on Windows/WSL2, may involve similar stdin/powershell changes

3. PR feat: add input_copy and input_cut keybindings for keyboard-based text selection #7520: feat: add input_copy and input_cut keybindings for keyboard-based text selection

   • feat: add input_copy and input_cut keybindings for keyboard-based text selection #7520
   • Related: Addresses copy operations, though appears to be a feature rather than a fix

These PRs all touch the clipboard handling layer on Windows/WSL environments. You should verify if any address the same variable expansion issue or if they've already fixed this problem.

[Copilot]

Pull request overview

This PR fixes an issue on Windows where copying text containing PowerShell variables (like $env:FOO) would cause those variables to be evaluated/expanded due to PowerShell's string interpolation when passed as command-line arguments.

Changes:

• Modified Windows clipboard implementation to use stdin instead of command-line arguments
• Added explicit UTF-8 encoding configuration for PowerShell's input stream
• Aligned Windows implementation pattern with existing Linux clipboard implementations

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