Look like SaraFem and SaraSuite: no custom title bar

The window keeps its own title bar (or none, per HideWindowTitleBar), with
SaraSuite's header (name, Add to app menu for AppImages, gear). Settings
is now a dialog laid out like SaraFem's, with export/import on the
SaraSuite tab, and notifications use SaraFem's tinted toast style.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

Widgets.py

@@ -7,7 +7,7 @@ from typing import Callable, Optional
 
 import flet as ft
 
-from Core import AppConfig, ChildEnvironment, ChipButton, Note, Palette
+from Core import AppConfig, ChildEnvironment, ChipButton, Note, NotificationStyle, Palette
 from Service import RestartIfRunning
 from Sortd import Setup, SortdError
 
@@ -20,9 +20,12 @@ class App:
         self.Navigate: Callable[..., None] = lambda Name, **Arguments: None  # set by Main
 
     def Notify(self, Text: str, Kind: str = "info") -> None:
-        Color = {"success": Palette.Green, "error": Palette.Red, "warning": Palette.Yellow}.get(Kind, Palette.Text)
+        Background, Accent = NotificationStyle(Kind)
         self.Page.show_dialog(ft.SnackBar(
-            ft.Text(Text, color=Color), bgcolor=Palette.Surface0, duration=ft.Duration(seconds=4),
+            content=ft.Text(Text, color=Accent),
+            bgcolor=Background,
+            shape=ft.RoundedRectangleBorder(radius=4, side=ft.BorderSide(1, Accent)),
+            open=True,
         ))
 
     def LoadSetup(self) -> tuple[Optional[Setup], str]: