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/RecentSessionsSection.tsx

@@ -0,0 +1,45 @@
+import type { Session } from "../../../types/session";
+
+interface RecentSessionsSectionProps {
+	sessions: Session[];
+	onOpen: (session: Session) => void;
+}
+
+export const RecentSessionsSection = ({
+	sessions,
+	onOpen,
+}: RecentSessionsSectionProps) => {
+	if (sessions.length === 0) return null;
+
+	return (
+		<section className="card stack home-section">
+			<div className="page-header">
+				<div>
+					<p className="eyebrow">Recent sessions</p>
+					<h2>{sessions.length}</h2>
+				</div>
+			</div>
+			<div className="recent-sessions-list">
+				{sessions.map((session) => (
+					<article className="recent-session-item" key={session.id}>
+						<div className="recent-session-info">
+							<span className="recent-session-name">
+								{session.display_name || session.tool_type_name || "Unnamed Session"}
+							</span>
+							<span className="muted">
+								{session.project_name} · {session.tool_type_name}
+							</span>
+						</div>
+						<button
+							className="ghost-button small"
+							type="button"
+							onClick={() => onOpen(session)}
+						>
+							Open
+						</button>
+					</article>
+				))}
+			</div>
+		</section>
+	);
+};