fix(acp): separate acp sessions from user sessions (#7857)

Signed-off-by: Rabi Mishra <mishra.rabi@gmail.com>
Co-authored-by: Douwe Osinga <douwe@squareup.com>

ui/desktop/openapi.json

@@ -7904,7 +7904,8 @@
           "sub_agent",
           "hidden",
           "terminal",
-          "gateway"
+          "gateway",
+          "acp"
         ]
       },
       "SessionsQuery": {

ui/desktop/src/api/types.gen.ts

@@ -1276,7 +1276,7 @@ export type SessionReplyResponse = {
     request_id: string;
 };
 
-export type SessionType = 'user' | 'scheduled' | 'sub_agent' | 'hidden' | 'terminal' | 'gateway';
+export type SessionType = 'user' | 'scheduled' | 'sub_agent' | 'hidden' | 'terminal' | 'gateway' | 'acp';
 
 export type SessionsQuery = {
     limit: number;