Show sent messages before the server confirms them

The composer now puts the bubble and clears the input as soon as you send, so a slow connection never holds either. The bot's status row reads "<name> is getting your message..." until the saved message arrives (by response or push), then switches to thinking. A failed send removes the bubble and restores the text and files.

src/dict/bot-queue-dict.ts

@@ -55,6 +55,13 @@ export const BotNeedsYouStatusLine = "Waiting on you";
  */
 export const BotWaitingStatusLine = "Waiting for a free model";
 
+/**
+ * What the thinking row says while a just-sent message is still on its way
+ * to the server, before the bot has it and before its reply is queued
+ * ("<name> is getting your message…").
+ */
+export const BotGettingMessageStatusLine = "Getting your message";
+
 /**
  * The bot's status line while its task waits for another job on the same
  * computer to finish.