fix(webi): handle special chars in USERPROFILE path and detect download failures

Co-authored-by: coolaj86 <122831+coolaj86@users.noreply.github.com>

_webi/curl-pipe-bootstrap.tpl.ps1

@@ -7,6 +7,11 @@
 New-Item -Path "$Env:USERPROFILE\Downloads\webi" -ItemType Directory -Force | Out-Null
 New-Item -Path "$Env:USERPROFILE\.local\bin" -ItemType Directory -Force | Out-Null
 if ($null -eq $Env:WEBI_HOST -or $Env:WEBI_HOST -eq "") { $Env:WEBI_HOST = "https://webinstall.dev" }
-curl.exe -s -A "windows" "$Env:WEBI_HOST/packages/webi/webi-pwsh.ps1" -o "$Env:USERPROFILE\.local\bin\webi-pwsh.ps1"
+$b_webi_ps1 = "$Env:USERPROFILE\.local\bin\webi-pwsh.ps1"
+curl.exe -s -A "windows" "$Env:WEBI_HOST/packages/webi/webi-pwsh.ps1" | Out-File -Encoding utf8 "$b_webi_ps1"
+if ($LASTEXITCODE -ne 0 -or -not (Test-Path "$b_webi_ps1") -or (Get-Item "$b_webi_ps1").Length -lt 100) {
+    Write-Error "error: failed to download '$Env:WEBI_HOST/packages/webi/webi-pwsh.ps1'"
+    exit 1
+}
 Set-ExecutionPolicy -Scope Process Bypass
-& "$Env:USERPROFILE\.local\bin\webi-pwsh.ps1" "{{ exename }}"
+& "$b_webi_ps1" "{{ exename }}"