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_backtests.py

@@ -411,3 +411,30 @@ async def test_terminal_detail_failure_releases_slot_but_keeps_platform_success(
     await tick(lane)
     assert len(platform.posts) == 2
     await lane.interrupt()
+
+
+async def test_run_list_projects_source_metadata_without_accepting_unknown_input(app, logged_in):
+    """Persisted source metadata must not turn the entire run list into a 500."""
+    await setup(app)
+    created = await start(logged_in, await preview(logged_in))
+    async with app.state.sessions.begin() as db:
+        row = await db.get(BacktestRun, created["backtest_run_id"])
+        row.source = {**row.source, "template_input_id": None, "extra_metadata": "not-an-input"}
+    response = await logged_in.get(f"{PREFIX}/runs?offset=0&source=")
+    assert response.status_code == 200
+    source = response.json()["items"][0]["source"]
+    assert source["kind"] == "test"
+    assert "template_input_id" not in source and "extra_metadata" not in source
+    assert source["input_snapshot_ids"] == []
+    detail = await logged_in.get(f"{PREFIX}/runs/{created['backtest_run_id']}")
+    assert detail.status_code == 200
+    assert detail.json()["source"] == source
+    rejected = await logged_in.post(
+        f"{PREFIX}/drafts",
+        json={
+            "name": "invalid",
+            "source": {"kind": "manual", "extra_metadata": "invalid"},
+            "candidates": [candidate()],
+        },
+    )
+    assert rejected.status_code == 422