fix(gui): proper splitter placement for persona and bias panels

- Persona editor: splitter shown when BOTH models and prompt open (not just prompt)
- Bias profiles: move splitter OUTSIDE btool_scroll child, between both sections
- Fixed nesting issues causing EndTable/EndChild errors

src/gui_2.py

@@ -1855,9 +1855,9 @@ class App:
              imgui.end_table()
             imgui.tree_pop()
           imgui.end_child()
-          if self._bias_cats_open:
-           imgui.button("###bias_splitter", imgui.ImVec2(-1, 4))
-           if imgui.is_item_active(): self._bias_split_v = max(0.1, min(0.9, self._bias_split_v + imgui.get_io().mouse_delta.y / rem_bias_y))
+        if self._bias_cats_open:
+         imgui.button("###bias_splitter", imgui.ImVec2(-1, 4))
+         if imgui.is_item_active(): self._bias_split_v = max(0.1, min(0.9, self._bias_split_v + imgui.get_io().mouse_delta.y / rem_bias_y))
         
         opened_bc = imgui.collapsing_header("Category Multipliers", imgui.TreeNodeFlags_.default_open)
         if opened_bc != self._bias_cats_open: self._bias_cats_open = opened_bc
@@ -2007,7 +2007,7 @@ class App:
        imgui.pop_id()
       for i in reversed(to_remove): self._editing_persona_preferred_models_list.pop(i)
       imgui.end_child()
-     if self._persona_prompt_open:
+     if self._persona_models_open and self._persona_prompt_open:
       imgui.button("###persona_splitter", imgui.ImVec2(-1, 4))
       if imgui.is_item_active(): self._persona_split_v = max(0.1, min(0.9, self._persona_split_v + imgui.get_io().mouse_delta.y / rem_y))