refactor: extract dashboard, workspace, tool-types, and tool-configs components (Task 4.3)

- Extract DashboardSummary, ActiveSessionsList, ProjectsSection, QuickCreateForm,
  RecentSessionsSection from dashboard.tsx (480 → 110 lines)
- Extract WorkspaceSidebar from repo-workspace.tsx
- Extract ToolTypeList + ToolTypeForm from tool-types.tsx (409 → 135 lines)
- Extract ToolConfigList + ToolConfigForm from tool-configs.tsx (391 → 178 lines)
- Add use-dashboard-actions hook for shared dashboard action handlers
- Update feature barrels with new exports

Quality gates: tsc (pass), eslint (pass)
Refs: repo-restructure Task 4.3

apps/web/src/components/features/dashboard/DashboardSummary.tsx

@@ -0,0 +1,34 @@
+import type { DashboardSummary as DashboardSummaryType } from "../../../api/dashboard";
+
+interface DashboardSummaryProps {
+	summary: DashboardSummaryType;
+	activeSessionsCount: number;
+}
+
+const summaryCards = [
+	{ label: "Open sessions", key: "openSessions" },
+	{ label: "Projects", key: "projects" },
+	{ label: "Repositories", key: "repositories" },
+] as const;
+
+export const DashboardSummary = ({
+	summary,
+	activeSessionsCount,
+}: DashboardSummaryProps) => {
+	return (
+		<div className="home-summary-grid">
+			{summaryCards.map((card) => (
+				<article className="card home-summary-card" key={card.label}>
+					<p className="card-label">{card.label}</p>
+					<p className="card-value">
+						{card.key === "openSessions"
+							? activeSessionsCount
+							: card.key === "projects"
+								? summary.projects
+								: summary.repositories}
+					</p>
+				</article>
+			))}
+		</div>
+	);
+};