fix: Disabling switching router layouts after init

[PartyDonut]

Pull Request Description

This disables switching routers when the size/layout has already been decided.

Issue Being Fixed

Resolves #174

Checklist

• If a new package was added, did you ensure it works for all supported platforms? Is the package well maintained
• Check that any changes are related to the issue at hand.

[sourcery-ai]

Reviewer's Guide by Sourcery

This PR disables switching router layouts after the size/layout has been set. This addresses issue #174 by ensuring the router layout is only initialized once and prevents it from being re-initialized when the screen size or layout changes.

Class diagram showing AdaptiveLayoutBuilder changes

classDiagram
    class AdaptiveLayoutBuilder {
        <<ConsumerStatefulWidget>>
    }
    class _AdaptiveLayoutBuilderState {
        -LayoutState layout
        -ScreenLayout size
        -AutoRouter? router
        -TargetPlatform currentPlatform
        -ScrollController controller
        +updateSize()
        +build()
    }
    note for _AdaptiveLayoutBuilderState "Router is now nullable and initialized only once"
    AdaptiveLayoutBuilder --> _AdaptiveLayoutBuilderState

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State diagram for router layout initialization behavior

stateDiagram-v2
    [*] --> Uninitialized: App starts
    Uninitialized --> Initialized: First layout/size setting
    Initialized --> Initialized: Screen size changes
    note right of Initialized: Router layout remains fixed
    note left of Uninitialized: router is null

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File-Level Changes

Change	Details	Files
Prevents re-initialization of the router layout	Removed the re-assignment of the router variable inside the _updateLayout method. Initialized the router variable lazily using the null-aware assignment operator (??=). Changed the type of the router variable from AutoRouter to AutoRouter? (nullable).	lib/util/adaptive_layout.dart

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#174	Fix app resetting to home screen when auto-rotating while playing media	✅

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[sourcery-ai]

Hey @PartyDonut - I've reviewed your changes - here's some feedback:

Overall Comments:

• Consider adding tests to verify the router initialization behavior and ensure it doesn't get recreated after the initial setup.

Here's what I looked at during the review

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

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