Add detail pages, property panels, and restyle list pages

New pages: AgentDetail, GoalDetail, IssueDetail, ProjectDetail, Inbox,
MyIssues. New feature components: AgentProperties, GoalProperties,
IssueProperties, ProjectProperties, GoalTree, NewIssueDialog. Add
heartbeats API client. Restyle all list pages (Agents, Issues, Goals,
Projects, Dashboard, Costs, Activity, Org) with EntityRow, FilterBar,
and improved layouts. Add routing for detail views.

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

ui/src/components/GoalProperties.tsx

@@ -0,0 +1,53 @@
+import type { Goal } from "@paperclip/shared";
+import { StatusBadge } from "./StatusBadge";
+import { formatDate } from "../lib/utils";
+import { Separator } from "@/components/ui/separator";
+
+interface GoalPropertiesProps {
+  goal: Goal;
+}
+
+function PropertyRow({ label, children }: { label: string; children: React.ReactNode }) {
+  return (
+    <div className="flex items-center justify-between py-1.5">
+      <span className="text-xs text-muted-foreground">{label}</span>
+      <div className="flex items-center gap-1.5">{children}</div>
+    </div>
+  );
+}
+
+export function GoalProperties({ goal }: GoalPropertiesProps) {
+  return (
+    <div className="space-y-4">
+      <div className="space-y-1">
+        <PropertyRow label="Status">
+          <StatusBadge status={goal.status} />
+        </PropertyRow>
+        <PropertyRow label="Level">
+          <span className="text-sm capitalize">{goal.level}</span>
+        </PropertyRow>
+        {goal.ownerAgentId && (
+          <PropertyRow label="Owner">
+            <span className="text-sm font-mono">{goal.ownerAgentId.slice(0, 8)}</span>
+          </PropertyRow>
+        )}
+        {goal.parentId && (
+          <PropertyRow label="Parent Goal">
+            <span className="text-sm font-mono">{goal.parentId.slice(0, 8)}</span>
+          </PropertyRow>
+        )}
+      </div>
+
+      <Separator />
+
+      <div className="space-y-1">
+        <PropertyRow label="Created">
+          <span className="text-sm">{formatDate(goal.createdAt)}</span>
+        </PropertyRow>
+        <PropertyRow label="Updated">
+          <span className="text-sm">{formatDate(goal.updatedAt)}</span>
+        </PropertyRow>
+      </div>
+    </div>
+  );
+}