v1.8.17: revert broken undo, keep only alias-edit feature

Fully reverted sidebar, files_tab, totp_tab, server_dialog to v1.8.10
base. Removed all entry_undo bindings that broke Ctrl+V paste globally.
Only alias editing feature preserved (editable alias + rename support).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

gui/sidebar.py

@@ -5,7 +5,6 @@ Sidebar — server list with search, add/edit/delete buttons.
 import customtkinter as ctk
 from core.i18n import t
 from gui.widgets.status_badge import StatusBadge
-from gui.widgets.entry_undo import enable_undo
 
 
 class Sidebar(ctk.CTkFrame):
@@ -30,7 +29,6 @@ class Sidebar(ctk.CTkFrame):
         self.search_var.trace_add("write", lambda *_: self._refresh_list())
         self.search_entry = ctk.CTkEntry(self, placeholder_text=t("search"), textvariable=self.search_var)
         self.search_entry.pack(fill="x", padx=10, pady=(5, 10))
-        enable_undo(self.search_entry)
 
         # Server list
         self.list_frame = ctk.CTkScrollableFrame(self, fg_color="transparent")