feat: enhance table layout and interaction across various components

- Introduced a new `WorkspaceTable` component for consistent table styling and behavior.
- Updated `BacktestPage`, `DatasetPage`, and `DataPreparationPage` to utilize the new `WorkspaceTable`.
- Implemented compact row heights and ellipsis for long text in table cells.
- Added validation for online field queries to ensure at least one filter is provided.
- Enhanced error handling and user feedback for invalid input scenarios.
- Improved pagination controls with dynamic page size options.
- Documented table display specifications in `ui-tables.md`.
- Added tests to verify table layout, interaction, and error handling.

backend/tests/test_preparations.py

@@ -88,12 +88,13 @@ async def test_scope_dimensions_rejected_without_creating_collection(catalog, ke
 
 async def test_online_fields_without_sync_and_local_search_before_pagination(catalog):
     client, _, _ = catalog
-    response = await client.get("/api/v1/catalog/worldquant/fields", params={**SCOPE, "limit": 100})
+    params = {**SCOPE, "dataset_id": "TEST_FIN", "limit": 100}
+    response = await client.get("/api/v1/catalog/worldquant/fields", params=params)
     assert response.status_code == 200, response.text
     first = response.json()
     assert len(first["items"]) == 100 and first["has_more"]
     second = (
-        await client.get("/api/v1/catalog/worldquant/fields", params={**SCOPE, "limit": 100, "offset": 100})
+        await client.get("/api/v1/catalog/worldquant/fields", params={**params, "offset": 100})
     ).json()
     assert len(second["items"]) > 0
     assert (await client.get("/api/v1/catalog/fields", params=SCOPE)).json()["total"] == 0
@@ -298,7 +299,8 @@ async def test_full_sync_restart_keeps_page_and_auth_pauses_all_datasets(catalog
 async def test_online_instrument_type_is_verified(catalog):
     client, _, state = catalog
     state["fields"][0]["instrumentType"] = "FUTURE"
-    assert (await client.get("/api/v1/catalog/worldquant/fields", params=SCOPE)).status_code == 502
+    response = await client.get("/api/v1/catalog/worldquant/fields", params={**SCOPE, "q": "TEST"})
+    assert response.status_code == 502
 
 
 async def test_mcp_collection_reads_and_versioned_submit_contract(catalog):
@@ -350,3 +352,12 @@ async def test_retry_waiting_full_job_requeues_its_checkpoint(catalog):
     async with runner.sessions.begin() as db:
         result = await Business(db).retry_job(job.id)
         assert result["status"] == "queued" and result["checkpoint"]["offset"] == 100
+
+
+async def test_online_fields_reject_empty_criteria_before_requesting_platform(catalog):
+    client, _, state = catalog
+    before = list(state["calls"])
+    for params in (SCOPE, {**SCOPE, "q": "   ", "dataset_id": ""}):
+        response = await client.get("/api/v1/catalog/worldquant/fields", params=params)
+        assert response.status_code == 422
+    assert state["calls"] == before