feat: add OpenAI O3-mini model support and fix theme handling

- Add O3-mini model to OpenAI model options
- Remove forced dark theme to allow system/light theme options
- Fix JSON template escape sequence in custom prompts

src/agent/custom_prompts.py

@@ -14,7 +14,7 @@ class CustomSystemPrompt(SystemPrompt):
         """
         Returns the important rules for the agent.
         """
-        text = """
+        text = r"""
     1. RESPONSE FORMAT: You must ALWAYS respond with valid JSON in this exact format:
        {
          "current_state": {

src/utils/utils.py

@@ -140,7 +140,7 @@ def get_llm_model(provider: str, **kwargs):
 # Predefined model names for common providers
 model_names = {
     "anthropic": ["claude-3-5-sonnet-20240620", "claude-3-opus-20240229"],
-    "openai": ["gpt-4o", "gpt-4", "gpt-3.5-turbo"],
+    "openai": ["gpt-4o", "gpt-4", "gpt-3.5-turbo", "o3-mini"],
     "deepseek": ["deepseek-chat", "deepseek-reasoner"],
     "gemini": ["gemini-2.0-flash-exp", "gemini-2.0-flash-thinking-exp", "gemini-1.5-flash-latest", "gemini-1.5-flash-8b-latest", "gemini-2.0-flash-thinking-exp-1219" ],
     "ollama": ["qwen2.5:7b", "llama2:7b", "deepseek-r1:14b", "deepseek-r1:32b"],

webui.py

@@ -616,18 +616,8 @@ def create_ui(config, theme_name="Ocean"):
     }
     """
 
-    js = """
-    function refresh() {
-        const url = new URL(window.location);
-        if (url.searchParams.get('__theme') !== 'dark') {
-            url.searchParams.set('__theme', 'dark');
-            window.location.href = url.href;
-        }
-    }
-    """
-
     with gr.Blocks(
-            title="Browser Use WebUI", theme=theme_map[theme_name], css=css, js=js
+            title="Browser Use WebUI", theme=theme_map[theme_name], css=css
     ) as demo:
         with gr.Row():
             gr.Markdown(