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

app/routes/search.py

@@ -34,7 +34,9 @@ def search_page(
     db: Session = Depends(get_db),
 ):
     """搜索页面，支持 keyword 和 semantic 模式。"""
-    result = search_papers(db, query=q or None, tag=tag or None, sort=sort, page=page, mode=mode)
+    result = search_papers(
+        db, query=q or None, tag=tag or None, sort=sort, page=page, mode=mode
+    )
     all_tags = get_all_tags(db)
 
     return templates.TemplateResponse(
@@ -72,7 +74,9 @@ def search_api(
     db: Session = Depends(get_db),
 ):
     """搜索 JSON API，支持 keyword 和 semantic 模式。"""
-    result = search_papers(db, query=q or None, tag=tag or None, sort=sort, page=page, mode=mode)
+    result = search_papers(
+        db, query=q or None, tag=tag or None, sort=sort, page=page, mode=mode
+    )
     distances = result.get("distances", {})
 
     items = []
@@ -170,7 +174,9 @@ def _generate_rss_xml(papers: list[Paper], base_url: str, tag: str | None) -> st
         channel_title += f" — {tag}"
     lines.append(f"    <title>{escape(channel_title)}</title>")
     lines.append(f"    <link>{escape(base_url)}</link>")
-    lines.append("    <description>HuggingFace Daily Papers — 中文论文导览站</description>")
+    lines.append(
+        "    <description>HuggingFace Daily Papers — 中文论文导览站</description>"
+    )
     lines.append("    <language>zh-CN</language>")
 
     for paper in papers: