feat: launch mobile work from PWA shortcuts (Closes #737)

src/main.py

@@ -1012,6 +1012,9 @@ def _share_target_login_redirect(request: Request) -> str:
         for name in limits
         if request.query_params.get(name)
     ]
+    launch = request.query_params.get("launch", "")
+    if launch in {"continue", "new", "agenda"}:
+        shared.append(("launch", launch))
     if dashboard_auth.application_path(request) != "/" or not shared:
         return "login"
     continuation = f"./?{urlencode(shared)}"