WSL fallback: fix blank shortcut icons + complete uninstall of WSL-fallback artifacts

- install.ps1: refresh the shell icon cache (ie4uinit -show) right after creating the
  Desktop/Start Menu shortcuts, so the (valid) .ico renders immediately instead of showing
  a blank icon (Explorer caches per-.lnk icons; programmatically-created links need a poke).
- scripts/uninstall.ps1 + scripts/uninstall.sh: also remove the WSL-fallback artifacts the
  native uninstall missed -- the %LOCALAPPDATA%\Unsloth shim/launcher/icon dir, its user-PATH
  entry, and the real Studio install inside each WSL distro (rm ~/.unsloth + any CUDA llama
  build). Previously the native uninstaller only cleaned the (empty) native venv + .lnk files.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

install.ps1

@@ -1587,6 +1587,9 @@ shell.Run cmd, 0, False
                     $sc.Save()
                 }
                 step "shortcuts" "created Desktop + Start Menu shortcuts (launch WSL Studio + open browser)" "Green"
+                # Refresh the shell icon cache so the brand-new .lnk icons render immediately instead of
+                # showing blank (Explorer caches per-.lnk icons; programmatically-created links often need a poke).
+                try { & "$env:SystemRoot\System32\ie4uinit.exe" -show 2>$null } catch {}
             } catch {
                 substep "(could not create shortcuts: $($_.Exception.Message))" "Yellow"
             }

scripts/uninstall.ps1

@@ -336,6 +336,44 @@ function Uninstall-UnslothStudio {
         Remove-Item -LiteralPath 'HKCU:\Software\Unsloth' -Recurse -Force -ErrorAction SilentlyContinue
     } catch { }
 
+    # ── Windows-on-Arm WSL-fallback artifacts ──
+    # The ARM64+NVIDIA fallback installs Studio INSIDE WSL and drops a native shim + launcher under
+    # %LOCALAPPDATA%\Unsloth (note: "Unsloth", not "Unsloth Studio") with a PATH entry, while the real
+    # install lives in the WSL distro(s). The native cleanup above misses all of that -- handle it here.
+    _Step "Removing WSL-fallback artifacts (shim, launcher, PATH entry, WSL install)..."
+    $unslothDir = if ($env:LOCALAPPDATA) { Join-Path $env:LOCALAPPDATA "Unsloth" } else { $null }
+    if ($unslothDir) {
+        $shimDir = (Join-Path $unslothDir "bin").TrimEnd('\', '/')
+        try {
+            $rk = [Microsoft.Win32.Registry]::CurrentUser.OpenSubKey('Environment', $true)
+            if ($rk) {
+                try {
+                    $rp = $rk.GetValue('Path', '', [Microsoft.Win32.RegistryValueOptions]::DoNotExpandEnvironmentNames)
+                    if ($rp) {
+                        $kept = @(); $removed = $false
+                        foreach ($e in ($rp -split ';')) {
+                            if ([string]::IsNullOrWhiteSpace($e)) { continue }
+                            if (([Environment]::ExpandEnvironmentVariables($e).TrimEnd('\', '/')) -ieq $shimDir) { $removed = $true; _Substep "removed PATH entry: $e" "Green"; continue }
+                            $kept += $e
+                        }
+                        if ($removed) { $rk.SetValue('Path', ($kept -join ';'), [Microsoft.Win32.RegistryValueKind]::ExpandString) }
+                    }
+                } finally { $rk.Close() }
+            }
+        } catch { }
+        _RemovePath $unslothDir
+    }
+    # Remove the Studio install inside each WSL distro (the real GPU install + any CUDA llama.cpp build).
+    if (Get-Command wsl.exe -ErrorAction SilentlyContinue) {
+        try {
+            $distros = @(((& wsl.exe --list --quiet 2>$null) -join "`n").Replace([char]0, '') -split "`r?`n" | ForEach-Object { $_.Trim() } | Where-Object { $_ })
+            foreach ($d in $distros) {
+                & wsl.exe -d $d -u root -- bash -lc 'pkill -9 -f "unsloth studio" 2>/dev/null; pkill -9 -f "llama-server" 2>/dev/null; rm -rf /root/.unsloth /home/*/.unsloth /root/llama-cuda 2>/dev/null; true' 2>$null
+                if ($LASTEXITCODE -eq 0) { _Substep "cleaned Unsloth from WSL distro: $d" "Green" }
+            }
+        } catch { }
+    }
+
     Write-Host ""
     Write-Host "Unsloth Studio uninstalled."
     Write-Host "Note: Hugging Face model cache at %USERPROFILE%\.cache\huggingface was left in place."

scripts/uninstall.sh

@@ -247,7 +247,6 @@ case "$_os" in
                 # shellcheck disable=SC2016
                 # $env:APPDATA is a PowerShell expansion; intentionally literal at shell level.
                 powershell.exe -NoProfile -Command '
-                    $names = @("Desktop","StartMenu");
                     $dirs = @(
                         [Environment]::GetFolderPath("Desktop"),
                         (Join-Path $env:APPDATA "Microsoft\Windows\Start Menu\Programs")
@@ -256,6 +255,14 @@ case "$_os" in
                         if (-not $d) { continue }
                         $p = Join-Path $d "Unsloth Studio.lnk";
                         if (Test-Path -LiteralPath $p) { Remove-Item -LiteralPath $p -Force }
+                    }
+                    # WSL-fallback native shim/launcher dir (%LOCALAPPDATA%\Unsloth) + its PATH entry.
+                    $ud = if ($env:LOCALAPPDATA) { Join-Path $env:LOCALAPPDATA "Unsloth" } else { $null };
+                    if ($ud) {
+                        $shim = (Join-Path $ud "bin").TrimEnd("\","/");
+                        $up = [Environment]::GetEnvironmentVariable("Path","User");
+                        if ($up) { [Environment]::SetEnvironmentVariable("Path", (($up -split ";" | Where-Object { $_ -and ($_.TrimEnd("\","/") -ine $shim) }) -join ";"), "User") }
+                        if (Test-Path -LiteralPath $ud) { Remove-Item -LiteralPath $ud -Recurse -Force -ErrorAction SilentlyContinue }
                     }' >/dev/null 2>&1 || true
             fi
         fi