Add icon and Assistant header to top of AI Panel #5414

Job	Run time
Check which packages changed	0s
Boxel Motion Tests	55s
AI bot Tests	41s
Boxel UI Tests	1m 23s
Lint	3m 22s
Host Tests	8m 28s
Matrix Client Tests - Group 1	8m 31s
Matrix Client Tests - Group 2	8m 26s
Realm Server Tests	5m 1s
Build host	0s
Build realm-server	0s
EFS Config	0s
deploy-ai-bot	0s
Deploy realm server to staging	0s
Deploy host	0s
	36m 47s

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