Improve app page with sorting, recommendations and more (#520)

Scripts/FileIO/LoadAppPresetsFromJson.ps1

@@ -0,0 +1,22 @@
+# Read Apps.json and return the list of preset objects (Name + AppIds).
+# Returns an empty array if the file cannot be read or contains no presets.
+function LoadAppPresetsFromJson {
+    try {
+        $jsonContent = Get-Content -Path $script:AppsListFilePath -Raw | ConvertFrom-Json
+    }
+    catch {
+        Write-Warning "Failed to read Apps.json: $_"
+        return @()
+    }
+
+    if (-not $jsonContent.Presets) {
+        return @()
+    }
+
+    return @($jsonContent.Presets | ForEach-Object {
+        [PSCustomObject]@{
+            Name   = $_.Name
+            AppIds = @($_.AppIds)
+        }
+    })
+}