upd project structure

src/qbot/helpers/__init__.py

@@ -0,0 +1,23 @@
+from aiogram.types import InlineKeyboardButton
+
+from ..utils.navigation import pop_navigation_context
+from ..model.descriptors import CommandCallbackContext
+from ..model.settings import Settings
+
+
+async def get_back_button(
+    context: CommandCallbackContext, text: str = None
+) -> InlineKeyboardButton | None:
+    stack = context.state_data.get("navigation_stack")
+    if not stack:
+        return None
+
+    back_callback_data = pop_navigation_context(stack)
+
+    if not text:
+        text = await Settings.get(Settings.APP_STRINGS_BACK_BTN)
+
+    return InlineKeyboardButton(
+        text=text,
+        callback_data=back_callback_data.pack(),
+    )