Use system temp directory for temporary font downloads instead of $HOME

[Copilot]

Temporary download directories created by Install-NerdFont use $HOME as the base path. If the command fails before cleanup runs, these directories persist in the user's home folder where no OS-level cleanup reclaims them.

• Switch base path from $HOME to [System.IO.Path]::GetTempPath() — cross-platform .NET API resolving to $Env:TEMP (Windows) / /tmp (Linux/macOS)

# Before
$tempPath = Join-Path -Path $HOME -ChildPath "NerdFonts-$guid"

# After
$tempPath = Join-Path -Path ([System.IO.Path]::GetTempPath()) -ChildPath "NerdFonts-$guid"

GUID naming and clean block logic unchanged.

[github-actions]

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