Pre-visualize the estimated Sud course in the Automatic tab

Adds a static forecast plot to the (previously empty) Automatic tab,
showing the planned temperature course derived from a schedule's
declared ramp rates and hold durations alone (no plant/controller
model - just how long the schedule itself says each step takes).

The client now requests the schedule via Download right after
connecting, routing the reply to the forecast instead of a save
dialog since sud_download_path is only set for the user-initiated
download. SudTask also echoes the just-applied document back after a
successful Upload, so editing the schedule refreshes the forecast
without an extra round trip.

tasks/sud.py

@@ -74,6 +74,7 @@ class SudTask(ATask):
 			elif 'Upload' in pair[0]:
 				if self.sud.upload(pair[1]):
 					await self.send({'Name': self.sud.name, 'Description': self.sud.description})
+					await self.send({'Json': pair[1]})
 
 	async def send(self, data):
 		await self.msg_handler.send(data)