add chat flow for search results

ios/Packages/Sybil/Sources/Sybil/SybilAPIClient.swift

@@ -96,6 +96,16 @@ actor SybilAPIClient {
         return response.search
     }
 
+    func createChatFromSearch(searchID: String, title: String? = nil) async throws -> ChatSummary {
+        let response = try await request(
+            "/v1/searches/\(searchID)/chat",
+            method: "POST",
+            body: AnyEncodable(SearchChatCreateBody(title: title)),
+            responseType: ChatCreateResponse.self
+        )
+        return response.chat
+    }
+
     func deleteSearch(searchID: String) async throws {
         _ = try await request("/v1/searches/\(searchID)", method: "DELETE", responseType: DeleteResponse.self)
     }
@@ -552,3 +562,7 @@ private struct SearchCreateBody: Encodable {
     var title: String?
     var query: String?
 }
+
+private struct SearchChatCreateBody: Encodable {
+    var title: String?
+}