Refactor data providers and update abstractions

- Removed obsolete data providers: `AnchorCollectionDataProvider`, `ContentsDataProvider`, and others, consolidating logic into new composable providers.
- Added `ComposeDataProviders`, `SelectDataProvider`, and `RelationalDataProvider` for improved flexibility and reusability.
- Introduced `IManySelectionComposableDataProvider` interface to support multiple-node selection.
- Enhanced `UnitDownloader` with more robust progress tracking.
- Updated package references and project dependencies for consistency.
- Improved error handling in `StealthConfig` initialization for better fallback on browser drivers.
- Incremented project version to 2.4.5.

Beam.Stealth/StealthConfig.cs

@@ -8,10 +8,10 @@ using OpenQA.Selenium.Edge;
 
 namespace Beam.Stealth {
     public enum Browser {
-        Firefox,
-        Chrome,
-        Chromium,
-        Edge
+        Firefox = 0,
+        Chrome = 1,
+        Chromium = 2,
+        Edge = 3
     }
 
     public sealed class StealthConfig : IDisposable {
@@ -73,23 +73,42 @@ namespace Beam.Stealth {
             bool showBrowser = false,
             string? downloadDir = null,
             TimeSpan? timeOut = null,
-            Browser browser = Browser.Firefox,
+            Browser preferredBrowser = Browser.Firefox,
             ILogger? logger = null) {
             // pick or create a dedicated download folder
             downloadDir ??= Path.Combine(Path.GetTempPath(), Path.GetRandomFileName());
             Directory.CreateDirectory(downloadDir);
 
             bool headless = !showBrowser;
+            IWebDriver? driver = null;
+            List<Exception>? errors = [];
 
-            IWebDriver driver = browser switch {
-                Browser.Chrome or Browser.Chromium
-                    => new ChromeDriver(GetChromeOptions(downloadDir, headless)),
-                Browser.Edge
-                    => new EdgeDriver(GetEdgeOptions(downloadDir, headless)),
-                Browser.Firefox or _
-                    => new FirefoxDriver(GetFirefoxOptions(downloadDir, headless)),
-            };
+            while (preferredBrowser <= Browser.Edge) {
+                try {
+                    driver = preferredBrowser switch {
+                        Browser.Chrome or Browser.Chromium
+                            => new ChromeDriver(GetChromeOptions(downloadDir, headless)),
+                        Browser.Edge
+                            => new EdgeDriver(GetEdgeOptions(downloadDir, headless)),
+                        Browser.Firefox or _
+                            => new FirefoxDriver(GetFirefoxOptions(downloadDir, headless)),
+                    };
+                }
+                catch (Exception e) {
+                    if (preferredBrowser != Browser.Edge)
+                        logger?.LogWarning(e, "Failed to create driver for browser {Browser}, falling back to {Fallback}", preferredBrowser, Enum.GetName(preferredBrowser + 1));
+                    else {
+                        logger?.LogCritical(e, "Failed to create driver for browser {Browser}, no more fallback remaining!", preferredBrowser);
+                    }
+                    
+                    preferredBrowser++;
+                    errors.Add(e);
+                }
+            }
 
+            if (driver is null)
+                throw new AggregateException(errors);
+            
             return new StealthConfig(downloadDir) {
                 ShowBrowser = showBrowser,
                 TimeOut = timeOut ?? Timeout.InfiniteTimeSpan,