fix: break infinite event loop in Settings tab

The .change callbacks for settings components were outputting back to
their own trigger components, causing an infinite loop that froze the
browser. Removed the circular outputs — callbacks now only update
browser_state, profile_models_markdown, active_config_markdown, and
session_state.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: neoneye

frontend_single_user/app.py

@@ -399,7 +399,7 @@ def update_browser_settings_callback(openrouter_api_key, model, speedvsdetail, m
     session_state.speedvsdetail = speedvsdetail
     session_state.model_profile = model_profile
     profile_markdown = _profile_models_markdown(model_profile)
-    return updated_browser_state, openrouter_api_key, model, speedvsdetail, model_profile, profile_markdown, "", session_state
+    return updated_browser_state, profile_markdown, "", session_state
 
 def run_planner(submit_or_retry_button, plan_prompt, browser_state, session_state: SessionState):
     """
@@ -892,7 +892,7 @@ def check_api_key(session_state: SessionState):
     openrouter_api_key_text.change(
         fn=update_browser_settings_callback,
         inputs=[openrouter_api_key_text, model_radio, speedvsdetail_radio, model_profile_radio, browser_state, session_state],
-        outputs=[browser_state, openrouter_api_key_text, model_radio, speedvsdetail_radio, model_profile_radio, profile_models_markdown, active_config_markdown, session_state]
+        outputs=[browser_state, profile_models_markdown, active_config_markdown, session_state]
     ).then(
         fn=check_api_key,
         inputs=[session_state],
@@ -902,7 +902,7 @@ def check_api_key(session_state: SessionState):
     model_radio.change(
         fn=update_browser_settings_callback,
         inputs=[openrouter_api_key_text, model_radio, speedvsdetail_radio, model_profile_radio, browser_state, session_state],
-        outputs=[browser_state, openrouter_api_key_text, model_radio, speedvsdetail_radio, model_profile_radio, profile_models_markdown, active_config_markdown, session_state]
+        outputs=[browser_state, profile_models_markdown, active_config_markdown, session_state]
     ).then(
         fn=check_api_key,
         inputs=[session_state],
@@ -912,7 +912,7 @@ def check_api_key(session_state: SessionState):
     speedvsdetail_radio.change(
         fn=update_browser_settings_callback,
         inputs=[openrouter_api_key_text, model_radio, speedvsdetail_radio, model_profile_radio, browser_state, session_state],
-        outputs=[browser_state, openrouter_api_key_text, model_radio, speedvsdetail_radio, model_profile_radio, profile_models_markdown, active_config_markdown, session_state]
+        outputs=[browser_state, profile_models_markdown, active_config_markdown, session_state]
     ).then(
         fn=check_api_key,
         inputs=[session_state],
@@ -922,7 +922,7 @@ def check_api_key(session_state: SessionState):
     model_profile_radio.change(
         fn=update_browser_settings_callback,
         inputs=[openrouter_api_key_text, model_radio, speedvsdetail_radio, model_profile_radio, browser_state, session_state],
-        outputs=[browser_state, openrouter_api_key_text, model_radio, speedvsdetail_radio, model_profile_radio, profile_models_markdown, active_config_markdown, session_state]
+        outputs=[browser_state, profile_models_markdown, active_config_markdown, session_state]
     ).then(
         fn=check_api_key,
         inputs=[session_state],