refactor: use global scaffoldMessengerKey to display SnackBar

[ZauberNerd]

Based on: https://medium.com/@rodrigorivasdev/using-scaffoldmessenger-with-key-d626b465a483

Summary by Sourcery

Use a global key to access the ScaffoldMessenger for displaying SnackBars.

New Features:

• Introduced a new global key to access the ScaffoldMessenger.

Enhancements:

• Removed the GlobalContextProvider and instead use a global key to access the ScaffoldMessenger.

[sourcery-ai]

Reviewer's Guide by Sourcery

This PR refactors the way SnackBar messages are displayed by using a global scaffoldMessengerKey.

Sequence diagram for displaying SnackBar messages after refactor

sequenceDiagram
    participant App as MaterialApp
    participant Toast as ToastUtils
    participant Global as globals.scaffoldMessengerKey
    participant SM as ScaffoldMessenger

    App->>Global: Initialize scaffoldMessengerKey
    Toast->>Global: Access currentState
    Global->>SM: Get ScaffoldMessenger state
    Toast->>SM: showSnackBar(message)
    SM-->>Toast: Display SnackBar

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Class diagram showing the refactored SnackBar display mechanism

classDiagram
    class ToastUtils {
        -showToast(String message)
    }

    class globals {
        +GlobalKey~ScaffoldMessengerState~ scaffoldMessengerKey
    }

    class MaterialApp {
        +GlobalKey~ScaffoldMessengerState~ scaffoldMessengerKey
    }

    ToastUtils ..> globals : uses
    MaterialApp --> globals : uses scaffoldMessengerKey

    note for ToastUtils "Now uses global scaffoldMessengerKey
instead of GlobalContextProvider"
    note for globals "New global utility for
ScaffoldMessenger state"

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File-Level Changes

Change	Details	Files
Replaced the use of a global context with a global scaffoldMessengerKey for displaying SnackBar messages.	Removed the dependency on GlobalContextProvider for accessing the context. Used globals.scaffoldMessengerKey to display SnackBar messages. Removed the calls to GlobalContextProvider.instance.setContext(context). Added a global key scaffoldMessengerKey of type GlobalKey<ScaffoldMessengerState>. Set the scaffoldMessengerKey in the MaterialApp widget.	lib/bademagic_module/utils/toast_utils.dart lib/view/draw_badge_screen.dart lib/view/homescreen.dart lib/view/save_badge_screen.dart lib/view/saved_clipart.dart lib/main.dart
Created new file to hold global variables.	Created the file lib/globals/globals.dart. Declared the scaffoldMessengerKey variable in the new file.	lib/globals/globals.dart

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[sourcery-ai]

Hey @ZauberNerd - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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