Polish UI components and rework AgentConfigForm

Major AgentConfigForm rework with improved adapter configuration
fields and layout. Refine sidebar, breadcrumbs, and card/tab
components for visual consistency. Clean up page layouts across
Activity, Agents, Approvals, Costs, Dashboard, Goals, Inbox,
Issues, Org, and Projects pages. Minor heartbeat-run CLI fix.

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

ui/src/components/CommentThread.tsx

@@ -37,7 +37,7 @@ export function CommentThread({ comments, onAdd }: CommentThreadProps) {
 
       <div className="space-y-3">
         {comments.map((comment) => (
-          <div key={comment.id} className="rounded-md border border-border p-3">
+          <div key={comment.id} className="border border-border p-3">
             <div className="flex items-center justify-between mb-1">
               <span className="text-xs font-medium text-muted-foreground">
                 {comment.authorAgentId ? "Agent" : "Human"}