feat(admin): server-safe StatusCard and Import hub polish

Split OnlineUsersWidget from StatusCard, decouple ad delete button, sync badge import to ExternalTexts+WebsiteBadges, add Import section hub with cancelable SSE jobs and upload SQL option.

Co-authored-by: Cursor <[email protected]>

src/lib/staff-smoke-contract.test.ts

@@ -179,6 +179,21 @@ describe("staff smoke contract", () => {
 		);
 	});
 
+	it("keeps StatusCard server-safe without client boundary", () => {
+		expect(
+			readFileSync("src/components/admin/dashboard.tsx", "utf8"),
+		).not.toMatch(/^["']use client["']/m);
+		expect(existsSync("src/components/admin/online-users-widget.tsx")).toBe(
+			true,
+		);
+		expect(
+			readFileSync("src/components/admin/online-users-widget.tsx", "utf8"),
+		).toContain("use client");
+		expect(existsSync("src/app/admin/ads/edit-ad-delete-button.tsx")).toBe(
+			true,
+		);
+	});
+
 	it("ships ops health alerts, optional DB backup, and health rate limit", () => {
 		const worker = readFileSync("scripts/jobs-worker.ts", "utf8");
 		expect(worker).toContain("checkOpsHealth");
@@ -215,4 +230,19 @@ describe("staff smoke contract", () => {
 			"/admin/items",
 		);
 	});
+
+	it("ships import hub with synced badge import path", () => {
+		const nav = readFileSync("src/lib/admin-nav.ts", "utf8");
+		expect(nav).toContain('id: "import"');
+		expect(nav).toContain("importSubtitle");
+		expect(nav).toContain("/admin/import");
+		expect(existsSync("src/lib/services/import-badge.ts")).toBe(true);
+		const badgeService = readFileSync(
+			"src/lib/services/import-badge.ts",
+			"utf8",
+		);
+		expect(badgeService).toContain("ExternalTexts.json");
+		expect(badgeService).toContain("WebsiteBadges");
+		expect(badgeService).toContain("importBadgeSynced");
+	});
 });