Delta team/fix comment ui (#10)

fix các bug theo yêu cầu
https://fptsoftware362-my.sharepoint.com/❌/g/personal/nampdt_fpt_com/IQAHBJ4A9xqDTLgvt2bhukJEAdRB5LRz2hbJpTivvIiBSYM?wdExp=TEAMS-TREATMENT&web=1&isSPOFile=1&ovuser=f01e930a-b52e-42b1-b70f-a8882b5d043b%2CAnhTNM1%40fpt.com&clickparams=eyJBcHBOYW1lIjoiVGVhbXMtRGVza3RvcCIsIkFwcFZlcnNpb24iOiI0OS8yNjA4MTMxOTMxNyIsIkhhc0ZlZGVyYXRlZFVzZXIiOmZhbHNlfQ%3D%3D

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Co-authored-by: Duy Le Huu <duylh19@fpt.com>
Reviewed-on: #10
Co-authored-by: Anh Tran Nguyen Minh <anhtnm1@fpt.com>

presentation/co4e/co4e_chat.py

@@ -13,7 +13,7 @@ from PySide6.QtWidgets import QSplitter, QWidget
 from ...core import co4e, skills as skills_mod
 from ...core.co4e_builtins import BUILTIN_AGENTS
 from ...core.worker import AgentWorker
-from ...i18n import tr
+from ...i18n import bind_dynamic, tr
 from ...ui.chat_view import ChatView
 from ...ui.icons import icon
 from ...presentation.co4e.co4e_chat_view import ChatPanel
@@ -55,6 +55,12 @@ class Co4EChatMixin:
         self._co4e_routed_provider = None   # routing provider override for the next turn
         self._vsplit_sizes = [540, 220]         # sizes to restore when expanded
         self._msgs_collapsed = True
+        # The tooltip names the action the button would perform, so it depends on
+        # which way the box is folded — and the fold state lives here, not in the
+        # panel. Bound so a language change re-reads it instead of freezing the
+        # wording set when the tab was built.
+        bind_dynamic(self.chat_toggle_btn, lambda: self.chat_toggle_btn.setToolTip(
+            tr("co4e.tt_expand_msgs" if self._msgs_collapsed else "co4e.tt_collapse_msgs")))
         return panel
     def _toggle_messages(self) -> None:
         """Show/hide the WHOLE chat box (message list + composer) below the