chore: update compatibility with Flutter 3.47.1

[RmanAkbarzadeh]

Description

This PR updates the package for Flutter 3.47.1 and migrates the existing Material and Cupertino UI code to the new standalone material_ui and cupertino_ui packages.

Changes

• Updated Flutter compatibility to 3.47.1
• Migrated package:flutter/material.dart to package:material_ui/material_ui.dart
• Migrated package:flutter/cupertino.dart to package:cupertino_ui/cupertino_ui.dart
• Updated affected imports to work with the standalone UI packages
• Updated localization handling to use GlobalMaterialLocalizations.delegates, which provides the required Material, Cupertino, and Widgets localization delegates through the new standalone package structure

Validation

• dart analyze — passed
• flutter test — 274 tests passed

Notes

This is a compatibility and migration update. No intentional changes have been made to the package's existing behavior or functionality.

Pre-launch Checklist

• I have updated CHANGELOG.md with my changes
• I have run "dart format ." on the project
• I have added/updated relevant documentation

[Copilot]

🟡 Changes recommended

It introduces at least one concrete type-safety bug (math.max(0, double) assigned to double) and also leaves dependency/versioning updates in a state that can cause non-reproducible or inconsistent releases.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

This PR updates fluent_ui for Flutter 3.47.1 by migrating legacy flutter/material.dart and flutter/cupertino.dart usages to the new standalone material_ui and cupertino_ui packages, and adjusts localization delegate wiring to the new structure.

Changes:

• Migrated Material/Cupertino imports (including tests and example) to material_ui / cupertino_ui.
• Updated localization delegate plumbing to rely on GlobalMaterialLocalizations.delegates.
• Minor refactors/cleanups in a few widget/test implementations.

File summaries

File	Description
test/navigation_view_test.dart	Switches test import from flutter/material.dart to material_ui.
test/menu_bar_test.dart	Minor test cleanups (const inference, loop variable), aligns with updated APIs.
test/app_test.dart	Switches test import from flutter/material.dart to material_ui.
pubspec.yaml	Removes flutter_localizations SDK dep; adds material_ui/cupertino_ui.
lib/src/fluent_app.dart	Migrates imports and updates delegate yielding to GlobalMaterialLocalizations.delegates.
lib/src/controls/surfaces/info_bar.dart	Migrates Icons import to material_ui.
lib/src/controls/surfaces/acrylic.dart	Migrates Material import alias from Flutter to material_ui.
lib/src/controls/pickers/color_picker/color_picker.dart	Rewrites ternary into if element for list construction (format/style).
lib/src/controls/navigation/tab_view/tab_view.dart	Replaces flutter_localizations usage with material_ui delegates; minor if refactors.
lib/src/controls/inputs/slider.dart	Migrates Material import alias from Flutter to material_ui.
lib/src/controls/form/combo_box.dart	Small numeric expression tweak (but currently introduces a type issue).
lib/src/controls/flyouts/tooltip.dart	Removes a null-assertion on typography body style.
lib/l10n/generated/fluent_localizations.dart	Switches localization imports and delegates to GlobalMaterialLocalizations.delegates.
lib/fluent_ui.dart	Replaces exported Flutter Material symbols with material_ui equivalents; reorders exports.
example/pubspec.yaml	Adds material_ui/cupertino_ui deps for the example app.
example/lib/widgets/material_equivalents.dart	Migrates imports to material_ui / cupertino_ui.
example/lib/widgets/deferred_widget.dart	Migrates flutter/material.dart import to material_ui.
CHANGELOG.md	Adds a new 4.17.0 entry describing the migration/compat update.

Review details

Suppressed comments (1)

lib/src/controls/form/combo_box.dart:408

• Same issue as above: math.max(0, ...) returns num, but the variable is declared double. Use 0.0 so the result is a double.

    final selectedItemOffset = getSelectedItemOffset();
    final double maxTopOffset = math.max(0, size.height - scaledItemHeight);
    final minBottomOffset = math.min(scaledItemHeight, size.height);

• Files reviewed: 17/18 changed files
• Comments generated: 4
• Review effort level: Lite

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[RmanAkbarzadeh]

Fixed the issues identified by Copilot's code analysis and verified the changes with flutter analyze and flutter test.