Add a live status line to the stats panel

Shows what's happening right now underneath the table (connecting,
resolving the friend, discovering targets, fetching channel history,
waiting out a jittered delay before reacting, sending a reaction,
removing a reaction during --undo, etc). Status updates are cheap
and DB-free, using the last fetched stats for re-rendering.

bot/reactor.py

@@ -46,8 +46,14 @@ async def react_to_message(
     if already_reacted:
         return False
 
-    await asyncio.sleep(human_jitter())
+    chan_label = getattr(message.channel, "name", None) or target.name
+    delay = human_jitter()
+    if display is not None:
+        display.set_status(f"Waiting {delay:.1f}s before reacting in {chan_label}...")
+    await asyncio.sleep(delay)
 
+    if display is not None:
+        display.set_status(f"Sending reaction in {chan_label}...")
     try:
         await message.add_reaction(emoji)
     except discord.HTTPException: