v1 fix: Update properties or actions of opened AlertDialog

[FeodorFitsner]

Fix #5487
Fix #5439

Summary by Sourcery

Enable live updates of AlertDialog, CupertinoAlertDialog, and Banner controls by rebuilding them via ControlInheritedNotifier instead of caching, add error handling for missing content, and enhance the Python SDK dialog lifecycle methods by removing deprecated Page.open/close and improving show_dialog/pop_dialog docstrings and async on_dismiss handling.

Bug Fixes:

• Prevent stale dialog instances by removing cached _dialog fields and rebuilding dialogs on each open
• Show explicit ErrorControl messages when required dialog or banner content/actions are missing

Enhancements:

• Wrap dialog widgets in ControlInheritedNotifier to react to property or action changes
• Replace deprecated Page.open/close methods in the Python SDK and refactor show_dialog/pop_dialog for proper async dismissal and state management

Documentation:

• Add detailed docstrings to show_dialog and pop_dialog describing their behavior, arguments, and exceptions

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[Copilot]

Pull Request Overview

This PR fixes issues with updating properties or actions of opened AlertDialog, CupertinoAlertDialog, and Banner controls by replacing cached dialog instances with live rebuilding through ControlInheritedNotifier. The fix addresses stale dialog instances and improves the Python SDK dialog lifecycle methods.

• Replaces cached _dialog fields with ControlInheritedNotifier wrapper for live updates
• Improves Python SDK dialog methods by removing deprecated functions and enhancing async handling
• Adds integration tests to verify dynamic dialog property updates

Reviewed Changes

Copilot reviewed 6 out of 10 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
sdk/python/packages/flet/src/flet/controls/base_page.py	Removes deprecated methods, enhances show_dialog/pop_dialog with better async handling and documentation
packages/flet/lib/src/controls/alert_dialog.dart	Wraps dialog in ControlInheritedNotifier for live updates, removes cached _dialog field
packages/flet/lib/src/controls/cupertino_alert_dialog.dart	Similar changes to AlertDialog - adds ControlInheritedNotifier wrapper and removes caching
packages/flet/lib/src/controls/banner.dart	Simplifies banner creation by removing caching and using direct error string handling
sdk/python/packages/flet/integration_tests/controls/test_alert_dialog.py	Adds test for dynamic dialog property updates with screenshots
sdk/python/packages/flet/integration_tests/controls/test_cupertino_alert_dialog.py	Adds test for dynamic Cupertino dialog action updates with screenshots

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