feat: clickable URLs in chat log

Adds a parsing step when constructing `Message` objects that scans the
message content for anything that looks URL-like, and inserts new
`TextChunk`s into the message content with a URIPayload set.

Hovering over a URL shows an on-hover effect. Clicking a URL opens it in
the default browser. Right clicking shows the hostname, with an option
to open and an option to copy the URL to the clipboard.

ChatTwo/Store.cs

@@ -86,6 +86,11 @@ internal class Store : IDisposable {
                             ["Type"] = new("PartyFinder"),
                             ["Id"] = new(partyFinder.Id),
                         });
+                    case URIPayload uri:
+                        return new BsonDocument(new Dictionary<string, BsonValue> {
+                            ["Type"] = new("URI"),
+                            ["Uri"] = new(uri.Uri.ToString()),
+                        });
                 }
 
                 return payload?.Encode();
@@ -99,6 +104,7 @@ internal class Store : IDisposable {
                     return bson["Type"].AsString switch {
                         "Achievement" => new AchievementPayload((uint) bson["Id"].AsInt64),
                         "PartyFinder" => new PartyFinderPayload((uint) bson["Id"].AsInt64),
+                        "URI" => new URIPayload(new Uri(bson["Uri"].AsString)),
                         _ => null,
                     };
                 }