change back sealion model

app.py

@@ -949,7 +949,7 @@ async def generate_html_from_hocr(translated_hocr_html: str) -> str:
             raise ValueError("GEMINI_API_KEY not found in environment variables.")
 
         genai.configure(api_key=api_key)
-        model = genai.GenerativeModel(model_name="gemini-1.5-flash") # Updated model name
+        model = genai.GenerativeModel(model_name="gemini-2.5-flash") # Updated model name
 
         prompt = f"""
         Given the following hOCR HTML, which contains translated text and positional information, convert it into a clean, well-styled HTML document suitable for display in an iframe.
@@ -1400,7 +1400,7 @@ async def translate_texts_with_gemini(texts: list[str], target_language: str) ->
             raise ValueError("GEMINI_API_KEY not found in environment variables.")
 
         genai.configure(api_key=api_key)
-        model = genai.GenerativeModel(model_name="gemini-1.5-flash") # Using Flash for speed
+        model = genai.GenerativeModel(model_name="gemini-2.5-flash") # Using Flash for speed
 
         # Create a single prompt asking for a JSON array response
         prompt = f"""
@@ -1572,7 +1572,7 @@ async def generate_html_from_dual_ocr(
             raise ValueError("GEMINI_API_KEY not found in environment variables.")
 
         genai.configure(api_key=api_key)
-        model = genai.GenerativeModel(model_name="gemini-1.5-flash") # Using Flash for speed
+        model = genai.GenerativeModel(model_name="gemini-2.5-flash") # Using Flash for speed
 
         prompt = f"""
                 You are provided with two different translated OCR outputs for the same document.