feat: Social page — aggregated post queues + X/video history (#345)

* feat(api): x/video post history endpoints

Approved or rejected drafts vanished from both queues permanently --
the listers exclude terminal statuses and no history surface existed,
so a posted tweet or video was only findable in the raw task list.
GET /x/posts/history and GET /video/posts/history (CEO-gated, bounded)
return acted-on drafts newest-first with the posted platform ids and
reject reasons from the draft markers. Route tests assert by identity,
not emptiness: approve/reject commits the whole session, so prior
tests' rows legitimately persist in the shared test DB.

* feat(panel): Social page aggregating post queues and history

New dashboard page composing the X and video post queues with one
unified history section beneath them -- both platforms interleaved
newest-first, kind and outcome badges, posted X ids linking to the
live tweet, reject reasons shown. The command center's two full queue
cards become a compact pending-counts card linking to the page, so the
queues have one home instead of duplicated surfaces.

---------

Co-authored-by: Renn F <rennf93@users.noreply.github.com>

panel/src/components/dashboard/__tests__/command-center.test.tsx

@@ -0,0 +1,91 @@
+import { describe, it, expect, vi } from "vitest";
+import { render, screen } from "@testing-library/react";
+
+// Shallow-render the composition: mock every hook + child component so this
+// test only checks that the social summary card replaced the two full X/
+// video queues — each child's own behavior is covered by its own test file.
+vi.mock("@/hooks/use-dashboard", () => ({
+  useCeoOverview: () => ({
+    data: undefined,
+    isLoading: false,
+    isError: false,
+    refetch: vi.fn(),
+  }),
+  useAuditorFlags: () => ({
+    data: undefined,
+    isLoading: false,
+    isError: false,
+    refetch: vi.fn(),
+  }),
+  useRecentActivity: () => ({
+    data: undefined,
+    isLoading: false,
+    isError: false,
+    refetch: vi.fn(),
+  }),
+}));
+vi.mock("@/hooks/use-tasks", () => ({
+  useTasks: () => ({
+    data: undefined,
+    isLoading: false,
+    isError: false,
+    refetch: vi.fn(),
+  }),
+}));
+
+vi.mock("../team-health-cards", () => ({
+  TeamHealthCards: () => <div>TeamHealthCardsStub</div>,
+}));
+vi.mock("../key-metrics-panel", () => ({
+  KeyMetricsPanel: () => <div>KeyMetricsPanelStub</div>,
+}));
+vi.mock("../auditor-alerts-panel", () => ({
+  AuditorAlertsPanel: () => <div>AuditorAlertsPanelStub</div>,
+}));
+vi.mock("../active-blockers-panel", () => ({
+  ActiveBlockersPanel: () => <div>ActiveBlockersPanelStub</div>,
+}));
+vi.mock("../recent-activity-feed", () => ({
+  RecentActivityFeed: () => <div>RecentActivityFeedStub</div>,
+}));
+vi.mock("../quick-actions-bar", () => ({
+  QuickActionsBar: () => <div>QuickActionsBarStub</div>,
+}));
+vi.mock("../ceo-approval-queue", () => ({
+  CeoApprovalQueue: () => <div>CeoApprovalQueueStub</div>,
+}));
+vi.mock("../pr-review-queue", () => ({
+  PrReviewQueue: () => <div>PrReviewQueueStub</div>,
+}));
+vi.mock("../release-proposal-card", () => ({
+  ReleaseProposalCard: () => <div>ReleaseProposalCardStub</div>,
+}));
+vi.mock("../playbook-review-queue", () => ({
+  PlaybookReviewQueue: () => <div>PlaybookReviewQueueStub</div>,
+}));
+vi.mock("../social-summary-card", () => ({
+  SocialSummaryCard: () => <div>SocialSummaryCardStub</div>,
+}));
+vi.mock("../roadmap-review-queue", () => ({
+  RoadmapReviewQueue: () => <div>RoadmapReviewQueueStub</div>,
+}));
+vi.mock("../strategy-signals-panel", () => ({
+  StrategySignalsPanel: () => <div>StrategySignalsPanelStub</div>,
+}));
+vi.mock("../usage-overview-panel", () => ({
+  UsageOverviewPanel: () => <div>UsageOverviewPanelStub</div>,
+}));
+vi.mock("../scorecard-overview-panel", () => ({
+  ScorecardOverviewPanel: () => <div>ScorecardOverviewPanelStub</div>,
+}));
+
+import { CommandCenter } from "../command-center";
+
+describe("CommandCenter", () => {
+  it("renders the social summary card instead of the full X/video queues", () => {
+    render(<CommandCenter />);
+    expect(screen.getByText("SocialSummaryCardStub")).toBeInTheDocument();
+    expect(screen.queryByText("XPostQueueStub")).not.toBeInTheDocument();
+    expect(screen.queryByText("VideoPostQueueStub")).not.toBeInTheDocument();
+  });
+});