Option MICROSD_TOAST_TIMER_FOREVER refactor

- Prevent escaping the RemoveMicroSDWarningView by launching SettingsEntryUpdateSelectionView
  in a blocking mode. If the tracked setting remains unchanged, Back/normal navigation
  returns to the blocking view (RemoveMicroSDWarningView).
- Only 2 ways of escaping this mode: 1) physically removing MicroSD and
2) modifying the setting
- Add test tests/test_flows.py::TestFlowTest::test_remove_microsd_blocking covering:

src/seedsigner/views/settings_views.py

@@ -150,11 +150,15 @@ class SettingsEntryUpdateSelectionView(View):
         Handles changes to all selection-type settings (Multiselect, SELECT_1,
         Enabled/Disabled, etc).
     """
-    def __init__(self, attr_name: str, parent_initial_scroll: int = 0, selected_button: int = None):
+    def __init__(self, attr_name: str, parent_initial_scroll: int = 0, selected_button: int = None, blocking_view: View = None, unblocking_view: View = None):
         super().__init__()
         self.settings_entry = SettingsDefinition.get_settings_entry(attr_name)
         self.selected_button = selected_button
         self.parent_initial_scroll = parent_initial_scroll
+        # If the setting remains unchanged, navigation should return to blocking_view (if set)
+        self.blocking_view = blocking_view
+        # unblocking_view is an optional target to navigate to once the setting actually changes.
+        self.unblocking_view = unblocking_view
 
 
     def run(self):
@@ -200,6 +204,8 @@ class SettingsEntryUpdateSelectionView(View):
         )
 
         if ret_value == RET_CODE__BACK_BUTTON:
+            if self.blocking_view:
+                return Destination(self.blocking_view, clear_history=True)
             return settings_menu_view_destination
 
         value = self.settings_entry.get_selection_option_value(ret_value)
@@ -219,8 +225,7 @@ class SettingsEntryUpdateSelectionView(View):
 
         else:
             # All other types are single selects (e.g. Enabled/Disabled, SELECT_1)
-            if value == initial_value:
-                # No change, return to menu
+            if value == initial_value and not self.blocking_view:
                 return settings_menu_view_destination
             else:
                 updated_value = value
@@ -238,11 +243,21 @@ class SettingsEntryUpdateSelectionView(View):
 
         if destination:
             return destination
+        
+        # If this selection view was opened from a blocking flow (e.g. RemoveMicroSDWarningView),
+        # prevent navigation away until the setting actually changes. If it hasn't changed,
+        # return to the blocking view so it can re-evaluate the state.
+        if self.blocking_view:
+            current_value = self.settings.get_value(self.settings_entry.attr_name)
+            if current_value == initial_value:
+                return Destination(self.blocking_view, clear_history=True)
+            elif self.unblocking_view:
+                return Destination(self.unblocking_view, clear_history=True)
 
         # All selects stay in place; re-initialize where in the list we left off
         self.selected_button = ret_value
 
-        return Destination(SettingsEntryUpdateSelectionView, view_args=dict(attr_name=self.settings_entry.attr_name, parent_initial_scroll=self.parent_initial_scroll, selected_button=self.selected_button), skip_current_view=True)
+        return Destination(SettingsEntryUpdateSelectionView, view_args=dict(attr_name=self.settings_entry.attr_name, parent_initial_scroll=self.parent_initial_scroll, selected_button=self.selected_button, blocking_view=self.blocking_view, unblocking_view=self.unblocking_view), skip_current_view=True)
 
 
 

src/seedsigner/views/view.py

@@ -412,10 +412,10 @@ class OptionDisabledView(View):
 
 class RemoveMicroSDWarningView(View):
     CONTINUE = ButtonOption("Continue")
-    DISMISS = ButtonOption("Dismiss")
+    SETTINGS = ButtonOption("Settings")
 
     def run(self):
-        button_data = [self.CONTINUE, self.DISMISS]
+        button_data = [self.CONTINUE, self.SETTINGS]
         selected_menu_num = self.run_screen(
             WarningScreen,
             title=_("Action Required"),
@@ -426,8 +426,20 @@ class RemoveMicroSDWarningView(View):
             button_data=button_data,
         )
 
-        from seedsigner.hardware.microsd import MicroSD
-        if button_data[selected_menu_num] == self.CONTINUE and MicroSD.get_instance().is_inserted:
-            return Destination(RemoveMicroSDWarningView, clear_history=True)
-        else:
-            return Destination(MainMenuView, clear_history=True)
+        if button_data[selected_menu_num] == self.CONTINUE:
+            from seedsigner.hardware.microsd import MicroSD
+            if not MicroSD.get_instance().is_inserted:
+                return Destination(MainMenuView, clear_history=True)
+            else:
+                return Destination(RemoveMicroSDWarningView, clear_history=True)
+
+        elif button_data[selected_menu_num] == self.SETTINGS:
+            from seedsigner.views.settings_views import SettingsEntryUpdateSelectionView
+            return Destination(
+                SettingsEntryUpdateSelectionView, 
+                view_args=dict(
+                    attr_name=SettingsConstants.SETTING__MICROSD_TOAST_TIMER,
+                    blocking_view=RemoveMicroSDWarningView,
+                    unblocking_view=MainMenuView
+                )
+            )

tests/test_flows.py

@@ -9,8 +9,12 @@ from seedsigner.models.seed import Seed
 from seedsigner.views import scan_views
 from seedsigner.views.psbt_views import PSBTSelectSeedView
 from seedsigner.views.seed_views import SeedBackupView, SeedMnemonicEntryView, SeedOptionsView, SeedsMenuView
-from seedsigner.views.view import Destination, MainMenuView, PowerOptionsView, UnhandledExceptionView, View
+from seedsigner.views.view import Destination, MainMenuView, PowerOptionsView, UnhandledExceptionView, RemoveMicroSDWarningView, MainMenuView, View
 from seedsigner.views.tools_views import ToolsMenuView, ToolsCalcFinalWordNumWordsView
+from seedsigner.views.settings_views import SettingsEntryUpdateSelectionView
+from seedsigner.models.settings_definition import SettingsDefinition
+from seedsigner.models.settings import SettingsConstants
+from seedsigner.hardware.microsd import MicroSD
 
 
 
@@ -192,3 +196,47 @@ class TestFlowTest(FlowTest):
             FlowStep(MainMenuView),  # Need a next Destination to force the first step to run
         ])
 
+    def test_remove_microsd_blocking(self):
+        """
+        Verifies three related behaviors:
+
+        1) If the RemoveMicroSDWarningView launches the SettingsEntryUpdateSelectionView
+           and the user presses Back without changing the tracked setting, the flow
+           returns to RemoveMicroSDWarningView (the blocking condition remains).
+        2) If the user changes the tracked setting while in the settings entry, the
+           flow unblocks and navigates to MainMenuView.
+        3) If the MicroSD is physically removed and the user presses Continue on the
+           warning, the flow proceeds to MainMenuView.
+        """
+        controller = Controller.get_instance()
+
+        settings_entry = SettingsDefinition.get_settings_entry(SettingsConstants.SETTING__MICROSD_TOAST_TIMER)
+        controller.settings.set_value(settings_entry.attr_name, SettingsConstants.MICROSD_TOAST_TIMER_FOREVER)
+
+        # There are only two ways of exiting RemoveMicroSDWarningView when SETTING__MICROSD_TOAST_TIMER -> MICROSD_TOAST_TIMER_FOREVER
+        self.run_sequence([
+            FlowStep(RemoveMicroSDWarningView, button_data_selection=RemoveMicroSDWarningView.SETTINGS),
+            FlowStep(SettingsEntryUpdateSelectionView, screen_return_value=RET_CODE__BACK_BUTTON),
+            FlowStep(RemoveMicroSDWarningView, button_data_selection=RemoveMicroSDWarningView.SETTINGS),
+            # 1) Modifying the setting
+            FlowStep(SettingsEntryUpdateSelectionView, screen_return_value=0),
+            FlowStep(MainMenuView)
+        ])
+
+        self.reset_controller()
+        controller = Controller.get_instance()
+
+        settings_entry = SettingsDefinition.get_settings_entry(SettingsConstants.SETTING__MICROSD_TOAST_TIMER)
+        controller.settings.set_value(settings_entry.attr_name, SettingsConstants.MICROSD_TOAST_TIMER_FOREVER)
+
+        # 2) Removing the MicroSD card and pressing CONTINUE
+        self.mock_microsd.is_inserted = False
+        assert MicroSD.get_instance().is_inserted is False
+
+        self.run_sequence([
+            FlowStep(RemoveMicroSDWarningView, button_data_selection=RemoveMicroSDWarningView.CONTINUE),
+            FlowStep(MainMenuView)
+        ])
+
+        # Restore the setting for the controller
+        controller.settings.set_value(settings_entry.attr_name, SettingsConstants.MICROSD_TOAST_TIMER_FIVE_SECONDS)