feat(personas): Add Persona selector to AI Settings panel and PersonaManager init

src/gui_2.py

@@ -1978,6 +1978,18 @@ def hello():
      self.ui_active_bias_profile = bname
      ai_client.set_bias_profile(bname)
    imgui.end_combo()
+
+  imgui.text("Persona")
+  if not hasattr(self, 'ui_active_persona'):
+   self.ui_active_persona = ""
+  if imgui.begin_combo("##persona", self.ui_active_persona or "None"):
+   if imgui.selectable("None", not self.ui_active_persona)[0]:
+    self.ui_active_persona = ""
+   for pname in sorted(getattr(self.controller, 'personas', {}).keys()):
+    if imgui.selectable(pname, pname == self.ui_active_persona)[0]:
+     self.ui_active_persona = pname
+   imgui.end_combo()
+
   if self.current_provider == "gemini_cli":
    imgui.separator()
    imgui.text("Gemini CLI")