Introduce Beam.Fluent and Beam.Models projects

Added new Beam.Fluent and Beam.Models projects with staged download builder and data context models. Refactored and moved model classes from Beam.Temporary.Cli to Beam.Models. Added new data providers and extended DataBindings in Beam.Dynamic. Renamed Beam.Puppeteer to Beam.Playwright and updated related classes. Updated project references and package versions. Removed obsolete and unused files from Beam.Temporary.Cli.

Beam.Dynamic/DropDownDataProvider.cs

@@ -2,6 +2,8 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Runtime.InteropServices;
+using System.Runtime.InteropServices.Marshalling;
 using System.Text;
 using System.Text.Json;
 using System.Threading.Tasks;
@@ -12,6 +14,18 @@ namespace Beam.Dynamic {
               IDataProvider<string[]>, 
               IDataProvider<SourceLink[]> {
         public IBinding? Content { get; set; }
+        public string? RelativeTo { get; set; } 
+
+        private string GetAbsolute(string? @base, string relative) {
+            if (@base is null)
+                return relative;
+
+            if (@base.EndsWith('/'))
+                @base = @base[..^1];
+            if (relative.StartsWith('/'))
+                relative = relative[1..];
+            return @base + '/' + relative;
+        }
 
         public SourceLink[] Get(HtmlDocument document) {
             if (Content is null)
@@ -22,9 +36,9 @@ namespace Beam.Dynamic {
             List<SourceLink> links = [];
             foreach (var child in node.ChildNodes.Where(x => x.Name == "option")) {
                 var childValue = child.GetAttributeValue("value", null);
-                if (!Uri.TryCreate(childValue, UriKind.Absolute, out _))
+                if (!Uri.TryCreate(GetAbsolute(RelativeTo, childValue), UriKind.Absolute, out _))
                     continue;
-                links.Add(new SourceLink(childValue));
+                links.Add(new SourceLink(GetAbsolute(RelativeTo, childValue)));
             }
 
             return links.ToArray();