Polish workbench result states

backend/tests/test_sprint81_result_state_polish.py

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+from pathlib import Path
+
+
+ROOT = Path(__file__).resolve().parents[2]
+
+
+def test_result_state_css_contracts() -> None:
+    css = (ROOT / "frontend" / "src" / "styles" / "app.css").read_text(encoding="utf-8")
+
+    assert ".result-state" in css
+    assert ".result-state-error" in css
+    assert ".result-state-empty" in css
+    assert ".result-state-loading" in css
+    assert ".result-state-ready" in css
+    assert ".result-state strong" in css
+    assert ".result-state p" in css
+    assert "overflow-wrap: anywhere;" in css
+
+
+def test_quality_and_export_panels_use_result_state_blocks() -> None:
+    quality_panel = (ROOT / "frontend" / "src" / "components" / "quality" / "QualityResultsPanel.tsx").read_text(
+        encoding="utf-8"
+    )
+    export_center = (ROOT / "frontend" / "src" / "components" / "exports" / "ExportCenter.tsx").read_text(
+        encoding="utf-8"
+    )
+
+    assert 'className="result-state result-state-error"' in quality_panel
+    assert 'className="result-state result-state-empty"' in quality_panel
+    assert 'className="result-state result-state-error"' in export_center
+    assert 'className="result-state result-state-empty"' in export_center
+    assert 'className="result-state result-state-loading"' in export_center
+
+
+def test_ai_labs_use_result_state_blocks() -> None:
+    detection_lab = (ROOT / "frontend" / "src" / "components" / "detection" / "DetectionLab.tsx").read_text(
+        encoding="utf-8"
+    )
+    segmentation_lab = (
+        ROOT / "frontend" / "src" / "components" / "segmentation" / "SegmentationLab.tsx"
+    ).read_text(encoding="utf-8")
+
+    for content in (detection_lab, segmentation_lab):
+        assert 'className="result-state result-state-loading"' in content
+        assert 'className="result-state result-state-error"' in content
+        assert 'className="result-state result-state-empty"' in content
+        assert 'className="result-state result-state-ready"' in content