diff --git a/src/gui_2.py b/src/gui_2.py
index 6ac4e42..ddbbacf 100644
--- a/src/gui_2.py
+++ b/src/gui_2.py
@@ -1081,226 +1081,155 @@ class App:
 
  def _render_tool_preset_manager_content(self, is_embedded: bool = False) -> None:
   avail = imgui.get_content_region_avail()
+  if not hasattr(self, "_tool_split_v"): self._tool_split_v = 0.4
   try:
    if imgui.begin_table("tp_main_split", 2, imgui.TableFlags_.resizable | imgui.TableFlags_.borders_inner_v):
     imgui.table_setup_column("List", imgui.TableColumnFlags_.width_fixed, 200)
     imgui.table_setup_column("Editor", imgui.TableColumnFlags_.width_stretch)
     imgui.table_next_row()
     
-    # Left Column: Presets
+    # Left Sidebar
     imgui.table_next_column()
     imgui.begin_child("tp_list_pane", imgui.ImVec2(0, 0), False)
     if imgui.button("New Tool Preset", imgui.ImVec2(-1, 0)):
-     self._editing_tool_preset_name = ""
-     self._editing_tool_preset_categories = {cat: {} for cat in models.DEFAULT_TOOL_CATEGORIES}
-     self._editing_tool_preset_scope = "project"
-     self._selected_tool_preset_idx = -1
+     self._editing_tool_preset_name = ""; self._editing_tool_preset_categories = {cat: {} for cat in models.DEFAULT_TOOL_CATEGORIES}
+     self._editing_tool_preset_scope = "project"; self._selected_tool_preset_idx = -1
     imgui.separator()
     preset_names = sorted(self.controller.tool_presets.keys())
     for i, name in enumerate(preset_names):
      if imgui.selectable(name, self._selected_tool_preset_idx == i)[0]:
-      self._selected_tool_preset_idx = i
-      self._editing_tool_preset_name = name
+      self._selected_tool_preset_idx = i; self._editing_tool_preset_name = name
       preset = self.controller.tool_presets[name]
       self._editing_tool_preset_categories = {cat: copy.deepcopy(tools) for cat, tools in preset.categories.items()}
     imgui.end_child()
 
-    # Right Column: Editor
+    # Right Editor
     imgui.table_next_column()
     avail_r = imgui.get_content_region_avail()
-    # Subtract space for bottom buttons (approx 45px)
-    imgui.begin_child("tp_edit_pane", imgui.ImVec2(0, avail_r.y - 45), False)
+    # Leave space for bottom buttons
+    imgui.begin_child("tp_editor_content", imgui.ImVec2(0, avail_r.y - 45), False)
     
     p_name = self._editing_tool_preset_name or "(New Tool Preset)"
-    imgui.text_colored(C_IN, f"Editing Tool Preset: {p_name}")
-    imgui.separator()
+    imgui.text_colored(C_IN, f"Editing Tool Preset: {p_name}"); imgui.separator()
     
     if imgui.begin_table("tp_meta", 2):
-     imgui.table_setup_column("L", imgui.TableColumnFlags_.width_fixed, 80)
-     imgui.table_setup_column("F", imgui.TableColumnFlags_.width_stretch)
-     imgui.table_next_row()
-     imgui.table_next_column()
-     imgui.text("Name:")
-     imgui.table_next_column()
-     imgui.set_next_item_width(-1)
-     _, self._editing_tool_preset_name = imgui.input_text("##etpn", self._editing_tool_preset_name)
-     imgui.table_next_row()
-     imgui.table_next_column()
-     imgui.text("Scope:")
-     imgui.table_next_column()
-     if imgui.radio_button("Global", self._editing_tool_preset_scope == "global"):
-      self._editing_tool_preset_scope = "global"
-     imgui.same_line()
-     if imgui.radio_button("Project", self._editing_tool_preset_scope == "project"):
-      self._editing_tool_preset_scope = "project"
+     imgui.table_setup_column("L", imgui.TableColumnFlags_.width_fixed, 80); imgui.table_setup_column("F", imgui.TableColumnFlags_.width_stretch)
+     imgui.table_next_row(); imgui.table_next_column(); imgui.text("Name:"); imgui.table_next_column(); imgui.set_next_item_width(-1); _, self._editing_tool_preset_name = imgui.input_text("##etpn", self._editing_tool_preset_name)
+     imgui.table_next_row(); imgui.table_next_column(); imgui.text("Scope:"); imgui.table_next_column()
+     if imgui.radio_button("Global", self._editing_tool_preset_scope == "global"): self._editing_tool_preset_scope = "global"
+     imgui.same_line(); 
+     if imgui.radio_button("Project", self._editing_tool_preset_scope == "project"): self._editing_tool_preset_scope = "project"
      imgui.end_table()
 
-    imgui.dummy(imgui.ImVec2(0, 4))
-    imgui.text("Categories & Tools:")
-    imgui.same_line()
-    cat_opts = ["All"] + sorted(list(models.DEFAULT_TOOL_CATEGORIES.keys()))
-    f_idx = cat_opts.index(self.ui_tool_filter_category) if self.ui_tool_filter_category in cat_opts else 0
-    imgui.set_next_item_width(200)
-    ch_cat, next_f_idx = imgui.combo("##tp_filter", f_idx, cat_opts)
-    if ch_cat:
-     self.ui_tool_filter_category = cat_opts[next_f_idx]
-
-    # Use ~35% of height for tool list
-    tool_list_h = (avail_r.y - 45) * 0.35
-    imgui.begin_child("tp_scroll", imgui.ImVec2(0, tool_list_h), True)
-    for cat_name, default_tools in models.DEFAULT_TOOL_CATEGORIES.items():
-     if self.ui_tool_filter_category != "All" and self.ui_tool_filter_category != cat_name:
-      continue
-     if imgui.tree_node(cat_name):
-      if cat_name not in self._editing_tool_preset_categories:
-       self._editing_tool_preset_categories[cat_name] = []
-      curr_cat_tools = self._editing_tool_preset_categories[cat_name]
-      if imgui.begin_table(f"tt_{cat_name}", 2, imgui.TableFlags_.borders_inner_v):
-       imgui.table_setup_column("Tool", imgui.TableColumnFlags_.width_fixed, 180)
-       imgui.table_setup_column("Ctrls", imgui.TableColumnFlags_.width_stretch)
-       for tool_name in default_tools:
-        tool = next((t for t in curr_cat_tools if t.name == tool_name), None)
-        mode = "disabled" if tool is None else tool.approval
-        imgui.table_next_row()
-        imgui.table_next_column()
-        imgui.text(tool_name)
-        imgui.table_next_column()
-        if imgui.radio_button(f"Off##{cat_name}_{tool_name}", mode == "disabled"):
-         if tool: curr_cat_tools.remove(tool)
-        imgui.same_line()
-        if imgui.radio_button(f"Auto##{cat_name}_{tool_name}", mode == "auto"):
-         if not tool:
-          tool = models.Tool(name=tool_name, approval="auto")
-          current_cat_tools.append(tool)
-         else:
-          tool.approval = "auto"
-        imgui.same_line()
-        if imgui.radio_button(f"Ask##{cat_name}_{tool_name}", mode == "ask"):
-         if not tool:
-          tool = models.Tool(name=tool_name, approval="ask")
-          current_cat_tools.append(tool)
-         else:
-          tool.approval = "ask"
-        if tool:
-         imgui.same_line()
-         imgui.text(" W:")
-         imgui.same_line()
-         imgui.set_next_item_width(60)
-         _, tool.weight = imgui.slider_int(f"##w_{cat_name}_{tool_name}", tool.weight, 1, 5)
-         imgui.same_line()
-         imgui.text(" P:")
-         imgui.same_line()
-         imgui.set_next_item_width(-1)
-         pb_str = json.dumps(tool.parameter_bias)
-         ch_pb, pb_new = imgui.input_text(f"##pb_{cat_name}_{tool_name}", pb_str)
-         if ch_pb:
-          try: tool.parameter_bias = json.loads(pb_new)
-          except: pass
-       imgui.end_table()
-       imgui.tree_pop()
-    imgui.end_child()
+    # Vertical split calculation
+    total_h = imgui.get_content_region_avail().y - 100
+    h1 = total_h * self._tool_split_v
+    h2 = total_h - h1 - 8
 
     imgui.dummy(imgui.ImVec2(0, 4))
-    imgui.separator()
-    imgui.text_colored(C_SUB, "Bias Profiles")
-    # Bias fills remaining space
-    imgui.begin_child("bias_area", imgui.ImVec2(0, imgui.get_content_region_avail().y), True)
-    if imgui.begin_table("bias_split", 2, imgui.TableFlags_.resizable | imgui.TableFlags_.borders_inner_v):
-     imgui.table_setup_column("BList", imgui.TableColumnFlags_.width_fixed, 150)
-     imgui.table_setup_column("BEdit", imgui.TableColumnFlags_.width_stretch)
-     imgui.table_next_row()
-     imgui.table_next_column()
-     imgui.begin_child("blist_pane", imgui.ImVec2(0, 0), False)
-     if imgui.button("New Profile", imgui.ImVec2(-1, 0)):
-      self._editing_bias_profile_name = ""
-      self._editing_bias_profile_tool_weights = {}
-      self._editing_bias_profile_category_multipliers = {}
-      self._selected_bias_profile_idx = -1
-     imgui.separator()
-     bnames = sorted(self.bias_profiles.keys())
-     for i, bname in enumerate(bnames):
-      if imgui.selectable(bname, self._selected_bias_profile_idx == i)[0]:
-       self._selected_bias_profile_idx = i
-       self._editing_bias_profile_name = bname
-       prof = self.bias_profiles[bname]
-       self._editing_bias_profile_tool_weights = copy.deepcopy(prof.tool_weights)
-       self._editing_bias_profile_category_multipliers = copy.deepcopy(prof.category_multipliers)
-     imgui.end_child()
-     imgui.table_next_column()
-     imgui.begin_child("bedit_pane", imgui.ImVec2(0, 0), False)
-     imgui.text("Name:")
-     imgui.same_line()
-     imgui.set_next_item_width(-1)
-     _, self._editing_bias_profile_name = imgui.input_text("##bname", self._editing_bias_profile_name)
-     
-     imgui.text_colored(C_KEY, "Tool Weighting:")
-     imgui.begin_child("btool_scroll", imgui.ImVec2(0, 150), True)
+    if imgui.collapsing_header("Categories & Tools", imgui.TreeNodeFlags_.default_open):
+     imgui.text("Filter:"); imgui.same_line()
+     cat_opts = ["All"] + sorted(list(models.DEFAULT_TOOL_CATEGORIES.keys()))
+     f_idx = cat_opts.index(self.ui_tool_filter_category) if self.ui_tool_filter_category in cat_opts else 0
+     imgui.set_next_item_width(200); ch_cat, next_f_idx = imgui.combo("##tp_filter", f_idx, cat_opts)
+     if ch_cat: self.ui_tool_filter_category = cat_opts[next_f_idx]
+
+     imgui.begin_child("tp_scroll", imgui.ImVec2(0, h1), True)
      for cat_name, default_tools in models.DEFAULT_TOOL_CATEGORIES.items():
-      if imgui.tree_node(f"{cat_name}##b"):
-       if imgui.begin_table(f"bt_{cat_name}", 2):
-        imgui.table_setup_column("T", imgui.TableColumnFlags_.width_fixed, 150)
-        imgui.table_setup_column("W", imgui.TableColumnFlags_.width_stretch)
-        for tn in default_tools:
-         imgui.table_next_row()
-         imgui.table_next_column()
-         imgui.text(tn)
-         imgui.table_next_column()
-         curr_w = self._editing_bias_profile_tool_weights.get(tn, 3)
-         imgui.set_next_item_width(-1)
-         ch_w, n_w = imgui.slider_int(f"##bw_{tn}", curr_w, 1, 10)
-         if ch_w:
-          self._editing_bias_profile_tool_weights[tn] = n_w
-        imgui.end_table()
-        imgui.tree_pop()
+      if self.ui_tool_filter_category != "All" and self.ui_tool_filter_category != cat_name: continue
+      if imgui.tree_node(cat_name):
+       if cat_name not in self._editing_tool_preset_categories: self._editing_tool_preset_categories[cat_name] = []
+       curr_cat_tools = self._editing_tool_preset_categories[cat_name]
+       if imgui.begin_table(f"tt_{cat_name}", 2, imgui.TableFlags_.borders_inner_v):
+        imgui.table_setup_column("Tool", imgui.TableColumnFlags_.width_fixed, 180); imgui.table_setup_column("Ctrls", imgui.TableColumnFlags_.width_stretch)
+        for tool_name in default_tools:
+         tool = next((t for t in curr_cat_tools if t.name == tool_name), None)
+         mode = "disabled" if tool is None else tool.approval
+         imgui.table_next_row(); imgui.table_next_column(); imgui.text(tool_name); imgui.table_next_column()
+         if imgui.radio_button(f"Off##{cat_name}_{tool_name}", mode == "disabled"):
+          if tool: curr_cat_tools.remove(tool)
+         imgui.same_line(); 
+         if imgui.radio_button(f"Auto##{cat_name}_{tool_name}", mode == "auto"):
+          if not tool: tool = models.Tool(name=tool_name, approval="auto"); current_cat_tools.append(tool)
+          else: tool.approval = "auto"
+         imgui.same_line(); 
+         if imgui.radio_button(f"Ask##{cat_name}_{tool_name}", mode == "ask"):
+          if not tool: tool = models.Tool(name=tool_name, approval="ask"); current_cat_tools.append(tool)
+          else: tool.approval = "ask"
+         if tool:
+          imgui.same_line(); imgui.text(" W:"); imgui.same_line(); imgui.set_next_item_width(60); _, tool.weight = imgui.slider_int(f"##w_{cat_name}_{tool_name}", tool.weight, 1, 5)
+          imgui.same_line(); imgui.text(" P:"); imgui.same_line(); imgui.set_next_item_width(-1); pb_str = json.dumps(tool.parameter_bias)
+          ch_pb, pb_new = imgui.input_text(f"##pb_{cat_name}_{tool_name}", pb_str)
+          if ch_pb:
+           try: tool.parameter_bias = json.loads(pb_new)
+           except: pass
+        imgui.end_table(); imgui.tree_pop()
      imgui.end_child()
-     
-     imgui.text_colored(C_KEY, "Category Multipliers:")
-     imgui.begin_child("bcat_scroll", imgui.ImVec2(0, 100), True)
-     if imgui.begin_table("bcats", 2):
-      imgui.table_setup_column("C", imgui.TableColumnFlags_.width_fixed, 150)
-      imgui.table_setup_column("M", imgui.TableColumnFlags_.width_stretch)
-      for cn in sorted(models.DEFAULT_TOOL_CATEGORIES.keys()):
-       imgui.table_next_row()
-       imgui.table_next_column()
-       imgui.text(cn)
-       imgui.table_next_column()
-       curr_m = self._editing_bias_profile_category_multipliers.get(cn, 1.0)
-       imgui.set_next_item_width(-1)
-       ch_m, n_m = imgui.slider_float(f"##cm_{cn}", curr_m, 0.1, 5.0, "%.1fx")
-       if ch_m:
-        self._editing_bias_profile_category_multipliers[cn] = n_m
-      imgui.end_table()
+
+    # Vertical Splitter
+    imgui.button("###tool_splitter", imgui.ImVec2(-1, 4))
+    if imgui.is_item_active():
+     self._tool_split_v = max(0.1, min(0.9, self._tool_split_v + imgui.get_io().mouse_delta.y / total_h))
+
+    imgui.dummy(imgui.ImVec2(0, 4))
+    if imgui.collapsing_header("Bias Profiles", imgui.TreeNodeFlags_.default_open):
+     imgui.begin_child("bias_area", imgui.ImVec2(0, h2), True)
+     if imgui.begin_table("bias_split", 2, imgui.TableFlags_.resizable | imgui.TableFlags_.borders_inner_v):
+      imgui.table_setup_column("BList", imgui.TableColumnFlags_.width_fixed, 150); imgui.table_setup_column("BEdit", imgui.TableColumnFlags_.width_stretch)
+      imgui.table_next_row(); imgui.table_next_column()
+      imgui.begin_child("blist_pane", imgui.ImVec2(0, 0), False)
+      if imgui.button("New Profile", imgui.ImVec2(-1, 0)):
+       self._editing_bias_profile_name = ""; self._editing_bias_profile_tool_weights = {}
+       self._editing_bias_profile_category_multipliers = {}; self._selected_bias_profile_idx = -1
+      imgui.separator(); bnames = sorted(self.bias_profiles.keys())
+      for i, bname in enumerate(bnames):
+       if imgui.selectable(bname, self._selected_bias_profile_idx == i)[0]:
+        self._selected_bias_profile_idx = i; self._editing_bias_profile_name = bname; prof = self.bias_profiles[bname]
+        self._editing_bias_profile_tool_weights = copy.deepcopy(prof.tool_weights); self._editing_bias_profile_category_multipliers = copy.deepcopy(prof.category_multipliers)
+      imgui.end_child()
+      imgui.table_next_column()
+      imgui.begin_child("bedit_pane", imgui.ImVec2(0, 0), False)
+      imgui.text("Name:"); imgui.same_line(); imgui.set_next_item_width(-1); _, self._editing_bias_profile_name = imgui.input_text("##bname", self._editing_bias_profile_name)
+      imgui.text_colored(C_KEY, "Tool Weighting:"); imgui.begin_child("btool_scroll", imgui.ImVec2(0, -120), True)
+      for cat_name, default_tools in models.DEFAULT_TOOL_CATEGORIES.items():
+       if imgui.tree_node(f"{cat_name}##b"):
+        if imgui.begin_table(f"bt_{cat_name}", 2):
+         imgui.table_setup_column("T", imgui.TableColumnFlags_.width_fixed, 220); imgui.table_setup_column("W", imgui.TableColumnFlags_.width_stretch)
+         for tn in default_tools:
+          imgui.table_next_row(); imgui.table_next_column(); imgui.text(tn); imgui.table_next_column()
+          curr_w = self._editing_bias_profile_tool_weights.get(tn, 3); imgui.set_next_item_width(-1)
+          ch_w, n_w = imgui.slider_int(f"##bw_{tn}", curr_w, 1, 10); 
+          if ch_w: self._editing_bias_profile_tool_weights[tn] = n_w
+         imgui.end_table(); imgui.tree_pop()
+      imgui.end_child()
+      imgui.text_colored(C_KEY, "Category Multipliers:"); imgui.begin_child("bcat_scroll", imgui.ImVec2(0, 80), True)
+      if imgui.begin_table("bcats", 2):
+       imgui.table_setup_column("C", imgui.TableColumnFlags_.width_fixed, 220); imgui.table_setup_column("M", imgui.TableColumnFlags_.width_stretch)
+       for cn in sorted(models.DEFAULT_TOOL_CATEGORIES.keys()):
+        imgui.table_next_row(); imgui.table_next_column(); imgui.text(cn); imgui.table_next_column()
+        curr_m = self._editing_bias_profile_category_multipliers.get(cn, 1.0); imgui.set_next_item_width(-1)
+        ch_m, n_m = imgui.slider_float(f"##cm_{cn}", curr_m, 0.1, 5.0, "%.1fx"); 
+        if ch_m: self._editing_bias_profile_category_multipliers[cn] = n_m
+       imgui.end_table(); imgui.end_child()
+      if imgui.button("Save Profile", imgui.ImVec2(-1, 0)):
+       try:
+        p = models.BiasProfile(name=self._editing_bias_profile_name, tool_weights=self._editing_bias_profile_tool_weights, category_multipliers=self._editing_bias_profile_category_multipliers)
+        self.controller._cb_save_bias_profile(p, self._editing_tool_preset_scope); self.ai_status = f"Saved: {p.name}"
+       except Exception as e: self.ai_status = f"Error: {e}"
+      imgui.end_child(); imgui.end_table()
      imgui.end_child()
-     
-     if imgui.button("Save Profile", imgui.ImVec2(-1, 0)):
-      try:
-       p = models.BiasProfile(name=self._editing_bias_profile_name, tool_weights=self._editing_bias_profile_tool_weights, category_multipliers=self._editing_bias_profile_category_multipliers)
-       self.controller._cb_save_bias_profile(p, self._editing_tool_preset_scope)
-       self.ai_status = f"Saved: {p.name}"
-      except Exception as e:
-       self.ai_status = f"Error: {e}"
-     imgui.end_child()
-     imgui.end_table()
-    imgui.end_child()
     imgui.end_child()
 
-    # Bottom Buttons
+    # Fixed Bottom Buttons
     imgui.separator()
-    imgui.dummy(imgui.ImVec2(0, 4))
     if imgui.button("Save Tool Preset", imgui.ImVec2(150, 0)):
-     if self._editing_tool_preset_name.strip():
-      self.controller._cb_save_tool_preset(self._editing_tool_preset_name.strip(), self._editing_tool_preset_categories, self._editing_tool_preset_scope)
-      self.ai_status = f"Saved Preset: {self._editing_tool_preset_name}"
-    imgui.same_line()
+     if self._editing_tool_preset_name.strip(): self.controller._cb_save_tool_preset(self._editing_tool_preset_name.strip(), self._editing_tool_preset_categories, self._editing_tool_preset_scope); self.ai_status = f"Saved Preset: {self._editing_tool_preset_name}"
+    imgui.same_line(); 
     if imgui.button("Delete Preset", imgui.ImVec2(120, 0)):
-     if self._editing_tool_preset_name:
-      self.controller._cb_delete_tool_preset(self._editing_tool_preset_name, self._editing_tool_preset_scope)
-      self._editing_tool_preset_name = ""
-      self._selected_tool_preset_idx = -1
-    imgui.same_line()
+     if self._editing_tool_preset_name: self.controller._cb_delete_tool_preset(self._editing_tool_preset_name, self._editing_tool_preset_scope); self._editing_tool_preset_name = ""; self._selected_tool_preset_idx = -1
+    imgui.same_line(); 
     if not is_embedded:
-     if imgui.button("Close", imgui.ImVec2(100, 0)):
-      self.show_tool_preset_manager_window = False
+     if imgui.button("Close", imgui.ImVec2(100, 0)): self.show_tool_preset_manager_window = False
     imgui.end_table()
   finally:
    pass
@@ -1322,247 +1251,151 @@ class App:
     imgui.end()
  def _render_persona_editor_window(self, is_embedded: bool = False) -> None:
   if not self.show_persona_editor_window and not is_embedded: return
-  
   if not is_embedded:
    imgui.set_next_window_size(imgui.ImVec2(1000, 800), imgui.Cond_.first_use_ever)
    opened, self.show_persona_editor_window = imgui.begin("Persona Editor", self.show_persona_editor_window)
    if not opened:
-    imgui.end()
-    return
+    imgui.end(); return
 
+  if not hasattr(self, "_persona_split_v"): self._persona_split_v = 0.4
   try:
    if imgui.begin_table("persona_main_split", 2, imgui.TableFlags_.resizable | imgui.TableFlags_.borders_inner_v):
     imgui.table_setup_column("List", imgui.TableColumnFlags_.width_fixed, 200)
     imgui.table_setup_column("Editor", imgui.TableColumnFlags_.width_stretch)
     imgui.table_next_row()
     
-    # --- Left Pane: List ---
+    # Left Sidebar
     imgui.table_next_column()
     imgui.begin_child("persona_list_pane", imgui.ImVec2(0, 0), False)
     if imgui.button("New Persona", imgui.ImVec2(-1, 0)):
-     self._editing_persona_name = ""
-     self._editing_persona_system_prompt = ""
-     self._editing_persona_tool_preset_id = ""
-     self._editing_persona_bias_profile_id = ""
+     self._editing_persona_name = ""; self._editing_persona_system_prompt = ""
+     self._editing_persona_tool_preset_id = ""; self._editing_persona_bias_profile_id = ""
      self._editing_persona_preferred_models_list = [{"provider": self.current_provider, "model": self.current_model, "temperature": 0.7, "max_output_tokens": 4096, "history_trunc_limit": 900000}]
-     self._editing_persona_scope = "project"
-     self._editing_persona_is_new = True
+     self._editing_persona_scope = "project"; self._editing_persona_is_new = True
     imgui.separator()
     personas = getattr(self.controller, 'personas', {})
     for name in sorted(personas.keys()):
-     is_sel = (name == self._editing_persona_name and not getattr(self, '_editing_persona_is_new', False))
-     if imgui.selectable(name, is_sel)[0]:
-      p = personas[name]
-      self._editing_persona_name = p.name
-      self._editing_persona_system_prompt = p.system_prompt or ""
-      self._editing_persona_tool_preset_id = p.tool_preset or ""
-      self._editing_persona_bias_profile_id = p.bias_profile or ""
-      import copy
-      self._editing_persona_preferred_models_list = copy.deepcopy(p.preferred_models) if p.preferred_models else []
-      self._editing_persona_scope = self.controller.persona_manager.get_persona_scope(p.name)
-      self._editing_persona_is_new = False
+     if imgui.selectable(name, name == self._editing_persona_name and not getattr(self, '_editing_persona_is_new', False))[0]:
+      p = personas[name]; self._editing_persona_name = p.name; self._editing_persona_system_prompt = p.system_prompt or ""
+      self._editing_persona_tool_preset_id = p.tool_preset or ""; self._editing_persona_bias_profile_id = p.bias_profile or ""
+      import copy; self._editing_persona_preferred_models_list = copy.deepcopy(p.preferred_models) if p.preferred_models else []
+      self._editing_persona_scope = self.controller.persona_manager.get_persona_scope(p.name); self._editing_persona_is_new = False
     imgui.end_child()
 
-    # --- Right Pane: Editor ---
+    # Right Editor
     imgui.table_next_column()
     avail = imgui.get_content_region_avail()
-    # Subtract space for bottom buttons (approx 45px)
-    imgui.begin_child("persona_editor_pane", imgui.ImVec2(0, avail.y - 45), False)
-    
+    # Ensure buttons stay at the absolute bottom
+    imgui.begin_child("persona_editor_content", imgui.ImVec2(0, avail.y - 40), False)
     header = "New Persona" if getattr(self, '_editing_persona_is_new', True) else f"Editing Persona: {self._editing_persona_name}"
-    imgui.text_colored(C_IN, header)
-    imgui.separator()
+    imgui.text_colored(C_IN, header); imgui.separator()
     
+    # Metadata
     if imgui.begin_table("p_meta", 2):
-     imgui.table_setup_column("L", imgui.TableColumnFlags_.width_fixed, 60)
-     imgui.table_setup_column("F", imgui.TableColumnFlags_.width_stretch)
-     imgui.table_next_row()
-     imgui.table_next_column()
-     imgui.text("Name:")
-     imgui.table_next_column()
-     imgui.set_next_item_width(-1)
-     _, self._editing_persona_name = imgui.input_text("##pname", self._editing_persona_name, 128)
-     imgui.table_next_row()
-     imgui.table_next_column()
-     imgui.text("Scope:")
-     imgui.table_next_column()
-     if imgui.radio_button("Global##pscope", getattr(self, '_editing_persona_scope', 'project') == "global"):
-      self._editing_persona_scope = "global"
-     imgui.same_line()
-     if imgui.radio_button("Project##pscope", getattr(self, '_editing_persona_scope', 'project') == "project"):
-      self._editing_persona_scope = "project"
+     imgui.table_setup_column("L", imgui.TableColumnFlags_.width_fixed, 60); imgui.table_setup_column("F", imgui.TableColumnFlags_.width_stretch)
+     imgui.table_next_row(); imgui.table_next_column(); imgui.text("Name:"); imgui.table_next_column(); imgui.set_next_item_width(-1); _, self._editing_persona_name = imgui.input_text("##pname", self._editing_persona_name, 128)
+     imgui.table_next_row(); imgui.table_next_column(); imgui.text("Scope:"); imgui.table_next_column()
+     if imgui.radio_button("Global##pscope", getattr(self, '_editing_persona_scope', 'project') == "global"): self._editing_persona_scope = "global"
+     imgui.same_line(); 
+     if imgui.radio_button("Project##pscope", getattr(self, '_editing_persona_scope', 'project') == "project"): self._editing_persona_scope = "project"
      imgui.end_table()
     
-    imgui.dummy(imgui.ImVec2(0, 4))
-    imgui.separator()
-    imgui.text("Preferred Models:")
-    # Use ~35% of remaining height for models
-    models_h = (avail.y - 45) * 0.35
-    imgui.begin_child("pref_models_scroll", imgui.ImVec2(0, models_h), True)
+    # Resizable Vertical Split for Models vs Prompt
+    total_h = imgui.get_content_region_avail().y - 120 # Account for headers and middle tools
+    h1 = total_h * self._persona_split_v
+    h2 = total_h - h1 - 8 # Splitter height
+    
+    imgui.dummy(imgui.ImVec2(0, 4)); imgui.separator(); imgui.text("Preferred Models:")
+    imgui.begin_child("pref_models_scroll", imgui.ImVec2(0, h1), True)
     to_remove = []
     providers = self.controller.PROVIDERS
     if not hasattr(self, '_persona_pref_models_expanded'): self._persona_pref_models_expanded = {}
     for i, entry in enumerate(self._editing_persona_preferred_models_list):
      imgui.push_id(f"pref_model_{i}")
-     prov = entry.get("provider", "Unknown")
-     mod = entry.get("model", "Unknown")
-     is_expanded = self._persona_pref_models_expanded.get(i, False)
-     
-     if imgui.button("-" if is_expanded else "+"):
-      self._persona_pref_models_expanded[i] = not is_expanded
-     imgui.same_line()
-     imgui.text(f"{i+1}.")
-     imgui.same_line()
-     imgui.text_colored(C_LBL, f"{prov}")
-     imgui.same_line()
-     imgui.text("-")
-     imgui.same_line()
-     imgui.text_colored(C_IN, f"{mod}")
-     
+     prov, mod, is_expanded = entry.get("provider", "Unknown"), entry.get("model", "Unknown"), self._persona_pref_models_expanded.get(i, False)
+     if imgui.button("-" if is_expanded else "+"): self._persona_pref_models_expanded[i] = not is_expanded
+     imgui.same_line(); imgui.text(f"{i+1}."); imgui.same_line(); imgui.text_colored(C_LBL, f"{prov}"); imgui.same_line(); imgui.text("-"); imgui.same_line(); imgui.text_colored(C_IN, f"{mod}")
      if not is_expanded:
-      imgui.same_line()
-      summary = f" (T:{entry.get('temperature', 0.7):.1f}, M:{entry.get('max_output_tokens', 0)}, H:{entry.get('history_trunc_limit', 0)})"
+      imgui.same_line(); summary = f" (T:{entry.get('temperature', 0.7):.1f}, M:{entry.get('max_output_tokens', 0)}, H:{entry.get('history_trunc_limit', 0)})"
       imgui.text_colored(C_SUB, summary)
-     
-     imgui.same_line(imgui.get_content_region_avail().x - 30)
-     if imgui.button("x"):
-      to_remove.append(i)
-     
+     imgui.same_line(imgui.get_content_region_avail().x - 30); 
+     if imgui.button("x"): to_remove.append(i)
      if is_expanded:
       imgui.indent(20)
       if imgui.begin_table("model_settings", 2, imgui.TableFlags_.borders_inner_v):
-       imgui.table_setup_column("Label", imgui.TableColumnFlags_.width_fixed, 120)
-       imgui.table_setup_column("Control", imgui.TableColumnFlags_.width_stretch)
-       
-       imgui.table_next_row()
-       imgui.table_next_column()
-       imgui.text("Provider:")
-       imgui.table_next_column()
-       imgui.set_next_item_width(-1)
-       p_idx = providers.index(prov) + 1 if prov in providers else 0
-       ch_p, p_idx = imgui.combo("##prov", p_idx, ["None"] + providers)
+       imgui.table_setup_column("Label", imgui.TableColumnFlags_.width_fixed, 120); imgui.table_setup_column("Control", imgui.TableColumnFlags_.width_stretch)
+       imgui.table_next_row(); imgui.table_next_column(); imgui.text("Provider:"); imgui.table_next_column(); imgui.set_next_item_width(-1)
+       p_idx = providers.index(prov) + 1 if prov in providers else 0; ch_p, p_idx = imgui.combo("##prov", p_idx, ["None"] + providers)
        if ch_p: entry["provider"] = providers[p_idx-1] if p_idx > 0 else ""
-       
-       imgui.table_next_row()
-       imgui.table_next_column()
-       imgui.text("Model:")
-       imgui.table_next_column()
-       imgui.set_next_item_width(-1)
-       m_list = self.controller.all_available_models.get(entry.get("provider", ""), [])
-       m_idx = m_list.index(mod) + 1 if mod in m_list else 0
+       imgui.table_next_row(); imgui.table_next_column(); imgui.text("Model:"); imgui.table_next_column(); imgui.set_next_item_width(-1)
+       m_list = self.controller.all_available_models.get(entry.get("provider", ""), []); m_idx = m_list.index(mod) + 1 if mod in m_list else 0
        ch_m, m_idx = imgui.combo("##model", m_idx, ["None"] + m_list)
        if ch_m: entry["model"] = m_list[m_idx-1] if m_idx > 0 else ""
-       
-       imgui.table_next_row()
-       imgui.table_next_column()
-       imgui.text("Temperature:")
-       imgui.table_next_column()
-       cw = imgui.get_content_region_avail().x
-       imgui.set_next_item_width(cw * 0.7)
-       _, entry["temperature"] = imgui.slider_float("##ts", entry.get("temperature", 0.7), 0.0, 2.0, "%.1f")
-       imgui.same_line()
-       imgui.set_next_item_width(-1)
-       _, entry["temperature"] = imgui.input_float("##ti", entry.get("temperature", 0.7), 0.1, 0.1, "%.1f")
-       
-       imgui.table_next_row()
-       imgui.table_next_column()
-       imgui.text("Max Tokens:")
-       imgui.table_next_column()
-       imgui.set_next_item_width(-1)
-       _, entry["max_output_tokens"] = imgui.input_int("##maxt", entry.get("max_output_tokens", 4096))
-       
-       imgui.table_next_row()
-       imgui.table_next_column()
-       imgui.text("History Limit:")
-       imgui.table_next_column()
-       imgui.set_next_item_width(-1)
-       _, entry["history_trunc_limit"] = imgui.input_int("##hist", entry.get("history_trunc_limit", 900000))
+       imgui.table_next_row(); imgui.table_next_column(); imgui.text("Temperature:"); imgui.table_next_column(); cw = imgui.get_content_region_avail().x
+       imgui.set_next_item_width(cw * 0.7); _, entry["temperature"] = imgui.slider_float("##ts", entry.get("temperature", 0.7), 0.0, 2.0, "%.1f")
+       imgui.same_line(); imgui.set_next_item_width(-1); _, entry["temperature"] = imgui.input_float("##ti", entry.get("temperature", 0.7), 0.1, 0.1, "%.1f")
+       imgui.table_next_row(); imgui.table_next_column(); imgui.text("Max Tokens:"); imgui.table_next_column(); imgui.set_next_item_width(-1); _, entry["max_output_tokens"] = imgui.input_int("##maxt", entry.get("max_output_tokens", 4096))
+       imgui.table_next_row(); imgui.table_next_column(); imgui.text("History Limit:"); imgui.table_next_column(); imgui.set_next_item_width(-1); _, entry["history_trunc_limit"] = imgui.input_int("##hist", entry.get("history_trunc_limit", 900000))
        imgui.end_table()
       imgui.unindent(20)
      imgui.pop_id()
-    for i in reversed(to_remove):
-     self._editing_persona_preferred_models_list.pop(i)
+    for i in reversed(to_remove): self._editing_persona_preferred_models_list.pop(i)
     imgui.end_child()
     
-    if imgui.button("Add Preferred Model", imgui.ImVec2(-1, 0)):
-     self._editing_persona_preferred_models_list.append({"provider": self.current_provider, "model": self.current_model, "temperature": 0.7, "max_output_tokens": 4096, "history_trunc_limit": 900000})
+    # Custom Splitter
+    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 / total_h))
     
-    imgui.dummy(imgui.ImVec2(0, 4))
-    imgui.separator()
+    imgui.dummy(imgui.ImVec2(0, 2))
+    if imgui.button("Add Preferred Model", imgui.ImVec2(-1, 0)): self._editing_persona_preferred_models_list.append({"provider": self.current_provider, "model": self.current_model, "temperature": 0.7, "max_output_tokens": 4096, "history_trunc_limit": 900000})
+    
+    imgui.dummy(imgui.ImVec2(0, 2))
     if imgui.begin_table("p_assign", 2):
-     imgui.table_setup_column("C1")
-     imgui.table_setup_column("C2")
-     imgui.table_next_row()
-     imgui.table_next_column()
-     imgui.text("Tool Preset:")
-     tn = ["None"] + sorted(self.controller.tool_presets.keys())
+     imgui.table_setup_column("C1"); imgui.table_setup_column("C2"); imgui.table_next_row()
+     imgui.table_next_column(); imgui.text("Tool Preset:"); tn = ["None"] + sorted(self.controller.tool_presets.keys())
      t_idx = tn.index(self._editing_persona_tool_preset_id) if getattr(self, '_editing_persona_tool_preset_id', '') in tn else 0
-     imgui.set_next_item_width(-1)
-     _, t_idx = imgui.combo("##ptp", t_idx, tn)
-     self._editing_persona_tool_preset_id = tn[t_idx] if t_idx > 0 else ""
-     imgui.table_next_column()
-     imgui.text("Bias Profile:")
-     bn = ["None"] + sorted(self.controller.bias_profiles.keys())
+     imgui.set_next_item_width(-1); _, t_idx = imgui.combo("##ptp", t_idx, tn); self._editing_persona_tool_preset_id = tn[t_idx] if t_idx > 0 else ""
+     imgui.table_next_column(); imgui.text("Bias Profile:"); bn = ["None"] + sorted(self.controller.bias_profiles.keys())
      b_idx = bn.index(self._editing_persona_bias_profile_id) if getattr(self, '_editing_persona_bias_profile_id', '') in bn else 0
-     imgui.set_next_item_width(-1)
-     _, b_idx = imgui.combo("##pbp", b_idx, bn)
-     self._editing_persona_bias_profile_id = bn[b_idx] if b_idx > 0 else ""
+     imgui.set_next_item_width(-1); _, b_idx = imgui.combo("##pbp", b_idx, bn); self._editing_persona_bias_profile_id = bn[b_idx] if b_idx > 0 else ""
      imgui.end_table()
     
-    if imgui.button("Manage Tools & Biases", imgui.ImVec2(-1, 0)):
-     self.show_tool_preset_manager_window = True
-    
-    imgui.dummy(imgui.ImVec2(0, 4))
-    imgui.separator()
-    imgui.text("System Prompt:")
+    if imgui.button("Manage Tools & Biases", imgui.ImVec2(-1, 0)): self.show_tool_preset_manager_window = True
+    imgui.dummy(imgui.ImVec2(0, 4)); imgui.separator(); imgui.text("System Prompt:")
     imgui.begin_child("p_prompt_header", imgui.ImVec2(0, 30), False)
-    imgui.text("Template:")
-    imgui.same_line()
-    p_pre = ["Select..."] + sorted(self.controller.presets.keys())
+    imgui.text("Template:"); imgui.same_line(); p_pre = ["Select..."] + sorted(self.controller.presets.keys())
     if not hasattr(self, "_load_preset_idx"): self._load_preset_idx = 0
-    imgui.set_next_item_width(200)
-    _, self._load_preset_idx = imgui.combo("##load_p", self._load_preset_idx, p_pre)
-    imgui.same_line()
+    imgui.set_next_item_width(200); _, self._load_preset_idx = imgui.combo("##load_p", self._load_preset_idx, p_pre)
+    imgui.same_line(); 
     if imgui.button("Apply"):
-     if self._load_preset_idx > 0:
-      self._editing_persona_system_prompt = self.controller.presets[p_pre[self._load_preset_idx]].system_prompt
-    imgui.same_line()
-    if imgui.button("Manage"):
-     self.show_preset_manager_window = True
+     if self._load_preset_idx > 0: self._editing_persona_system_prompt = self.controller.presets[p_pre[self._load_preset_idx]].system_prompt
+    imgui.same_line(); 
+    if imgui.button("Manage"): self.show_preset_manager_window = True
     imgui.end_child()
-    
-    # Prompt fills remaining space
-    _, self._editing_persona_system_prompt = imgui.input_text_multiline("##pprompt", self._editing_persona_system_prompt, imgui.ImVec2(-1, imgui.get_content_region_avail().y))
+    _, self._editing_persona_system_prompt = imgui.input_text_multiline("##pprompt", self._editing_persona_system_prompt, imgui.ImVec2(-1, h2))
     imgui.end_child()
 
-    # --- Bottom Buttons ---
+    # Fixed Bottom Buttons
     imgui.separator()
-    imgui.dummy(imgui.ImVec2(0, 4))
     if imgui.button("Save Persona", imgui.ImVec2(150, 0)):
      if self._editing_persona_name.strip():
       try:
-       import copy
-       persona = models.Persona(name=self._editing_persona_name.strip(), system_prompt=self._editing_persona_system_prompt, tool_preset=self._editing_persona_tool_preset_id or None, bias_profile=self._editing_persona_bias_profile_id or None, preferred_models=copy.deepcopy(self._editing_persona_preferred_models_list))
-       self.controller._cb_save_persona(persona, getattr(self, '_editing_persona_scope', 'project'))
-       self.ai_status = f"Saved: {persona.name}"
-      except Exception as e:
-       self.ai_status = f"Error: {e}"
-     else:
-      self.ai_status = "Name required"
-    imgui.same_line()
+       import copy; persona = models.Persona(name=self._editing_persona_name.strip(), system_prompt=self._editing_persona_system_prompt, tool_preset=self._editing_persona_tool_preset_id or None, bias_profile=self._editing_persona_bias_profile_id or None, preferred_models=copy.deepcopy(self._editing_persona_preferred_models_list))
+       self.controller._cb_save_persona(persona, getattr(self, '_editing_persona_scope', 'project')); self.ai_status = f"Saved: {persona.name}"
+      except Exception as e: self.ai_status = f"Error: {e}"
+     else: self.ai_status = "Name required"
+    imgui.same_line(); 
     if imgui.button("Delete", imgui.ImVec2(100, 0)):
      if not getattr(self, '_editing_persona_is_new', True) and self._editing_persona_name:
       self.controller._cb_delete_persona(self._editing_persona_name, getattr(self, '_editing_persona_scope', 'project'))
-      self._editing_persona_name = ""
-      self._editing_persona_is_new = True
+      self._editing_persona_name = ""; self._editing_persona_is_new = True
     if not is_embedded:
-     imgui.same_line()
-     if imgui.button("Close", imgui.ImVec2(100, 0)):
-      self.show_persona_editor_window = False
+     imgui.same_line(); 
+     if imgui.button("Close", imgui.ImVec2(100, 0)): self.show_persona_editor_window = False
     imgui.end_table()
   finally:
-   if not is_embedded:
-    imgui.end()
+   if not is_embedded: imgui.end()
  def _render_projects_panel(self) -> None:
   if self.perf_profiling_enabled: self.perf_monitor.start_component("_render_projects_panel")
   proj_name = self.project.get("project", {}).get("name", Path(self.active_project_path).stem)