feat: restyle admin UI and add per-user sync run history

Adds a self-hosted stylesheet (no CDN dependencies) with a card-based
dashboard and color-coded status badges, and shows the last 10 sync
runs per user on the detail page.

tests/web/test_users.py

@@ -1,6 +1,7 @@
 from fastapi.testclient import TestClient
 
-from app.db.repositories import UserRepository
+from app.db.models import SyncRunStatus
+from app.db.repositories import SyncRunRepository, UserRepository
 from app.security.credentials import CredentialCipher
 
 
@@ -171,6 +172,30 @@ def test_user_detail_page_shows_no_secrets(client: TestClient) -> None:
     assert "Max" in response.text
 
 
+def test_user_detail_page_shows_recent_sync_runs(client: TestClient) -> None:
+    login(client)
+    user_id = create_user_via_http(client)
+
+    with client.app.state.session_factory() as session:
+        repo = SyncRunRepository(session)
+        run = repo.start(user_id)
+        repo.finish(
+            run.id,
+            status=SyncRunStatus.SUCCESS,
+            discovered=3,
+            imported=2,
+            skipped=1,
+            failed=0,
+        )
+
+    response = client.get(f"/users/{user_id}")
+    assert response.status_code == 200
+    assert "Recent sync runs" in response.text
+    assert "success" in response.text
+    assert ">3<" in response.text
+    assert ">2<" in response.text
+
+
 def test_unknown_user_returns_404_for_detail(client: TestClient) -> None:
     login(client)
     response = client.get("/users/999999")