feat(webui): upgrade settings and sidebar controls (#3906)

* feat(settings): expand settings api payload

* feat(webui): build app-style settings center

* feat(webui): add centered chat search dialog

* fix(webui): shorten chat search label

* fix(webui): center dialog entrance animation

* fix(webui): simplify chat search results

* fix(webui): tighten mobile settings navigation

* feat(webui): persist sidebar state

* feat(webui): add sidebar organization controls

* refactor(webui): organize backend helpers

* refactor(webui): remove utils compatibility shims

* refactor(session): move shared webui helpers out of webui package

* feat(webui): add image generation settings

* style(webui): refine settings overview layout

* fix(webui): localize settings zh-CN copy

* style(webui): add settings status indicators

* feat(webui): show sidebar run indicators

* fix(webui): persist sidebar run indicators

* fix(webui): highlight settings pending status

* fix(webui): align settings test with provider update

* fix(utils): preserve legacy webui helper imports

tests/agent/test_loop_save_turn.py

@@ -11,7 +11,7 @@ from nanobot.bus.queue import MessageBus
 from nanobot.providers.base import LLMResponse
 from nanobot.session.goal_state import GOAL_STATE_KEY
 from nanobot.session.manager import Session, SessionManager
-from nanobot.utils.webui_turn_helpers import (
+from nanobot.session.webui_turns import (
     TITLE_GENERATION_MAX_TOKENS,
     TITLE_GENERATION_REASONING_EFFORT,
     WEBUI_SESSION_METADATA_KEY,
@@ -143,7 +143,7 @@ def test_webui_title_update_uses_captured_llm_runtime(
         return False
 
     monkeypatch.setattr(
-        "nanobot.utils.webui_turn_helpers.maybe_generate_webui_title_after_turn",
+        "nanobot.session.webui_turns.maybe_generate_webui_title_after_turn",
         fake_title_after_turn,
     )
     coordinator = WebuiTurnCoordinator(