feat: overhaul UI styling, improve templates, enhance services and tests

tests/test_pages.py

@@ -162,7 +162,9 @@ class TestComparePage:
         resp = client.get("/compare?ids=nonexistent.99999")
         assert resp.status_code == 200
 
-    def test_compare_page_shows_no_summary_placeholder(self, client, sample_papers_with_summary):
+    def test_compare_page_shows_no_summary_placeholder(
+        self, client, sample_papers_with_summary
+    ):
         """无总结的论文显示占位文本。"""
         # 2401.20005 没有 summary（status=pending）
         resp = client.get("/compare?ids=2401.20005")
@@ -198,26 +200,34 @@ class TestNavBar:
 class TestGracefulDegradation:
     """CHROMA_ENABLED=false 时优雅降级测试。"""
 
-    def test_search_works_without_chroma(self, client, monkeypatch, sample_papers_with_summary):
+    def test_search_works_without_chroma(
+        self, client, monkeypatch, sample_papers_with_summary
+    ):
         """CHROMA 关闭时 FTS5 搜索正常工作。"""
         monkeypatch.setattr(settings, "CHROMA_ENABLED", False)
         resp = client.get("/search?q=Test")
         assert resp.status_code == 200
         assert "Test Paper" in resp.text or "测试论文" in resp.text
 
-    def test_detail_works_without_chroma(self, client, monkeypatch, sample_papers_with_summary):
+    def test_detail_works_without_chroma(
+        self, client, monkeypatch, sample_papers_with_summary
+    ):
         """CHROMA 关闭时详情页正常工作。"""
         monkeypatch.setattr(settings, "CHROMA_ENABLED", False)
         resp = client.get("/paper/2401.20001")
         assert resp.status_code == 200
 
-    def test_trends_works_without_chroma(self, client, monkeypatch, sample_papers_with_summary):
+    def test_trends_works_without_chroma(
+        self, client, monkeypatch, sample_papers_with_summary
+    ):
         """CHROMA 关闭时趋势看板正常工作。"""
         monkeypatch.setattr(settings, "CHROMA_ENABLED", False)
         resp = client.get("/trends")
         assert resp.status_code == 200
 
-    def test_compare_works_without_chroma(self, client, monkeypatch, sample_papers_with_summary):
+    def test_compare_works_without_chroma(
+        self, client, monkeypatch, sample_papers_with_summary
+    ):
         """CHROMA 关闭时对比页正常工作。"""
         monkeypatch.setattr(settings, "CHROMA_ENABLED", False)
         resp = client.get("/compare?ids=2401.20001,2401.20002")