UI: richer toasts, log viewer scroll fix, multi-goal projects, active panel issue context

Improve activity toasts with actor names, issue identifiers, and
action links. Fix LogViewer auto-scroll to work with scrollable
parent containers instead of only window. Add issue context display
to ActiveAgentsPanel run cards. Support multi-goal selection in
NewProjectDialog. Update GoalDetail to match multi-goal project
linking.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

ui/src/components/NewIssueDialog.tsx

@@ -130,7 +130,7 @@ export function NewIssueDialog() {
         title: `${issue.identifier ?? "Issue"} created`,
         body: issue.title,
         tone: "success",
-        action: { label: "View issue", href: `/issues/${issue.id}` },
+        action: { label: `View ${issue.identifier ?? "issue"}`, href: `/issues/${issue.id}` },
       });
     },
   });