feat: implementation of the Compass page

[Yugesh-Kumar-S]

Fixes #2707

Changes

• Added the Compass instrument.
• Implemented compass when ground parallel to X,Y,Z direction.

Screenshots / Recordings

Checklist:

• No hard coding: I have used resources from strings.xml, dimens.xml and colors.xml without hard coding any value.
• No end of file edits: No modifications done at end of resource files strings.xml, dimens.xml or colors.xml.
• Code reformatting: I have reformatted code and fixed indentation in every file included in this pull request.
• No extra space: My code does not contain any extra lines or extra spaces than the ones that are necessary.

Summary by Sourcery

Introduce a new Compass instrument page that uses device magnetometer and accelerometer data to display a real-time heading with selectable ground-parallel axes, and integrate it into the app’s navigation.

New Features:

• Add Compass screen with rotating compass UI and heading readout based on magnetometer and accelerometer streams
• Enable axis selection (X, Y, Z) to align the compass parallel to the selected ground axis
• Register and navigate to the Compass page from the instruments menu

Build:

• Add sensors_plus dependency for accessing device sensor data

[sourcery-ai]

Reviewer's Guide

Implements a new Compass instrument by adding the sensors_plus dependency, wiring up navigation and routes for the compass page, and introducing a CompassScreen widget that subscribes to magnetometer and accelerometer streams to compute and render a smoothed heading with selectable ground-parallel axes.

File-Level Changes

Change	Details	Files
Navigation and routing updated for Compass page	Add case 9 in InstrumentsScreen switch to push or pop until '/compass' Import CompassScreen and register '/compass' route in main.dart	lib/view/instruments_screen.dart lib/main.dart
Dependency added for sensor access	Add sensors_plus: ^6.1.1 to project dependencies	pubspec.yaml
CompassScreen widget implemented	Create StatefulWidget subscribing to magnetometer and accelerometer streams Compute device orientation with axis-based heading, smoothing and conversion methods Build UI: rotating compass image, degree display, magnetometer readings, and axis selectors	lib/view/compass_screen.dart

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#2707	Maintain consistency with the existing PSLab Android app’s Compass behavior.	✅
#2707	Ensure smooth transition and rotation of the compass needle based on device orientation.	✅
#2707	Integrate real-time directional updates using magnetometer and accelerometer sensors.	✅

Possibly linked issues

• Compass UI with real-time directional updates #2707: The PR implements the Compass UI using magnetometer and accelerometer sensors as requested in the issue.

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[github-actions]

Build successful. APKs to test: https://github.com/fossasia/pslab-android/actions/runs/15417912407/artifacts/3249993206