feat: enable USB communication on newly supported platforms

[AsCress]

Summary by Sourcery

New Features:

• Support USB communication on Linux and macOS by registering DesktopUSBCommunicationHandler for these platforms

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

The PR updates the dependency injection in locator.dart to include Linux and macOS under the desktop USB communication handler, ensuring USB support on newly supported platforms without altering existing Android or iOS logic.

Class diagram for updated CommunicationHandler registration

classDiagram
    class CommunicationHandler
    class AndroidUSBCommunicationHandler
    class DesktopUSBCommunicationHandler
    class IosNoOpCommunicationHandler
    CommunicationHandler <|-- AndroidUSBCommunicationHandler
    CommunicationHandler <|-- DesktopUSBCommunicationHandler
    CommunicationHandler <|-- IosNoOpCommunicationHandler

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File-Level Changes

Change	Details	Files
Expanded desktop USB support to Linux and macOS	Added Platform.isLinux to the desktop handler condition Added Platform.isMacOS to the desktop handler condition	lib/providers/locator.dart

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[sourcery-ai]

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

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[github-actions]

Build Status

Build successful. APKs to test: https://github.com/fossasia/pslab-app/actions/runs/17713373715/artifacts/4006819938.

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