Window is no longer a fiber, should prevent window from locking up due to a fiber not yielding, replaced ui's direct async calls with BackgroundWorker.foreground_job, show pulsing circle behind app logo on boot

lib/background_worker.rb

@@ -0,0 +1,77 @@
+class W3DHub
+  class BackgroundWorker
+    @@instance = nil
+    @@alive = false
+
+    def self.create
+      raise "BackgroundWorker instance already exists!" if @@instance
+
+      @@alive = true
+      @@instance = self.new
+
+      Async do
+        @@instance.handle_jobs
+      end
+    end
+
+    def self.instance
+      @@instance
+    end
+
+    def self.alive?
+      @@alive
+    end
+
+    def self.shutdown!
+      @@alive = false
+    end
+
+    def self.job(job, callback)
+      @@instance.add_job(Job.new(job, callback))
+    end
+
+    def self.foreground_job(job, callback)
+      @@instance.add_job(Job.new(job, callback, true))
+    end
+
+    def initialize
+      @jobs = []
+    end
+
+    def handle_jobs
+      while BackgroundWorker.alive?
+        job = @jobs.shift
+
+        job&.do
+
+        sleep 0.1
+      end
+    end
+
+    def add_job(job)
+      @jobs << job
+    end
+
+    class Job
+      def initialize(job, callback, deliver_to_queue = false)
+        @job = job
+        @callback = callback
+
+        @deliver_to_queue = deliver_to_queue
+      end
+
+      def do
+        result = @job.call
+        deliver(result)
+      end
+
+      def deliver(result)
+        if @deliver_to_queue
+          $window.main_thread_queue << -> { @callback.call(result) }
+        else
+          @callback.call(result)
+        end
+      end
+    end
+  end
+end