fix: retry when semantic scholar req failed

main.py

@@ -57,8 +57,10 @@ def generate_answer(
     return response.parsed
 
 
-def semantic_scholar(query: str, top_k: int = 10) -> list[Article]:
-    resp = httpx.get(
+def semantic_scholar(
+    client: httpx.Client, query: str, top_k: int = 10
+) -> list[Article]:
+    resp = client.get(
         "https://api.semanticscholar.org/graph/v1/paper/search",
         params={
             "query": query,
@@ -106,7 +108,8 @@ def pubmed(query: str, top_k: int = 10, db: str = "pubmed"):
 
 
 def main():
-    client = genai.Client(api_key=os.environ["GOOGLE_API_KEY"])
+    semantic_scholar_client = httpx.Client(transport=httpx.HTTPTransport(retries=1))
+    gemini_client = genai.Client(api_key=os.environ["GOOGLE_API_KEY"])
 
     st.title("Ask ~~Jeeves~~ Elna")
     with st.form("search", border=False):
@@ -116,14 +119,14 @@ def main():
 
         if submit:
             with st.spinner("Finding papers...", show_time=True):
-                papers = semantic_scholar(query, top_k=30)
+                papers = semantic_scholar(semantic_scholar_client, query, top_k=30)
 
             if papers:
                 with st.spinner("Thinking...", show_time=True):
                     paper_map = {paper.id: paper for paper in papers}
                     sentences = []
                     citations = {}
-                    statements = generate_answer(client, query, papers)
+                    statements = generate_answer(gemini_client, query, papers)
                     for statement in statements:
                         if statement.citation:
                             if not (