feat(ui): detect missing fzf and show installation hints

Scripts/Start-IntuneManagementTui.ps1

@@ -18,6 +18,26 @@ function Test-FzfAvailable
     return [bool](Get-Command fzf -ErrorAction SilentlyContinue)
 }
 
+function Show-FzfHint
+{
+    if(Test-FzfAvailable) { return }
+    Write-Host "[fzf not found]" -ForegroundColor Yellow -NoNewline
+    Write-Host " Install fzf for the best interactive menu experience. Falling back to numbered menus." -ForegroundColor DarkGray
+    if($IsMacOS)
+    {
+        Write-Host "  Install: brew install fzf" -ForegroundColor DarkGray
+    }
+    elseif($IsLinux)
+    {
+        Write-Host "  Install: sudo apt install fzf  (or dnf/pacman)" -ForegroundColor DarkGray
+    }
+    else
+    {
+        Write-Host "  Install: winget install junegunn.fzf  (or choco install fzf)" -ForegroundColor DarkGray
+    }
+    Write-Host ""
+}
+
 function Show-FzfMenu
 {
     param(
@@ -126,6 +146,8 @@ if(Test-Path $settingsPath)
 }
 #endregion
 
+Show-FzfHint
+
 while($true)
 {
     Clear-Host