fix: sciencelab instance mgmt

[adityastic]

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[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request refactors the iOS communication logic by introducing a new CommunicationHandler interface and corresponding platform-specific implementations, updates dependency injection via getIt, and makes minor UI and plugin registration adjustments. The changes modify how ScienceLabCommon is created and used, moving away from a singleton factory pattern toward explicit instantiation with dependency injection and separating out iOS and Android communication handlers.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Refactored the communication handling infrastructure.	Replaced the old CommunicationHandler with a new interface defined in a dedicated base file. Introduced platform-specific handlers: AndroidUSBCommunicationHandler and IosNoOpCommunicationHandler. Updated ScienceLabCommon to use an explicit constructor taking a CommunicationHandler, and added helper functions such as initialize, setConnected, isConnected, and isDeviceFound. Updated dependent files to import the new CommunicationHandler base and handler implementations.	lib/others/science_lab_common.dart lib/communication/handler/base.dart lib/communication/handler/android_comms_handler.dart lib/communication/handler/ios_comms_handler.dart lib/communication/packet_handler.dart lib/communication/science_lab.dart
Switched to dependency injection using getIt.	Modified the locator to register lazy singletons for CommunicationHandler, ScienceLabCommon, and ScienceLab based on the platform. Updated BoardStateProvider to retrieve ScienceLabCommon via getIt and removed direct instantiation of CommunicationHandler. Updated OscilloscopeStateProvider to obtain ScienceLab from the locator instead of using static access.	lib/providers/board_state_provider.dart lib/providers/oscilloscope_state_provider.dart lib/providers/locator.dart
Adjusted UI layouts and plugin registrations.	Moved the SafeArea widget to wrap the inner container within the CommonScaffold in OscilloscopeScreen. Added new plugin registrations for flutter_audio_capture on Linux and permission_handler_windows on Windows. Updated related cmake and generated plugin registrant files.	lib/view/oscilloscope_screen.dart linux/flutter/generated_plugin_registrant.cc linux/flutter/generated_plugins.cmake windows/flutter/generated_plugin_registrant.cc windows/flutter/generated_plugins.cmake

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[github-actions]

Build successful. APKs to test: https://github.com/fossasia/pslab-android/actions/runs/13243890103/artifacts/2565322365