feat: added Software Licenses screen

[Vidhijain20]

Adds an auto-generated Software Licenses screen using the flutter_oss_licenses package.
oss_licenses.dart is generated by the package.
This example of the package was used to auto generate the screen from the file.

Screenshots / Recordings

Screen_recording_20250520_092936.mp4

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.

cc @CloudyPadmal @AsCress

Summary by Sourcery

Add a dedicated Software Licenses screen using the flutter_oss_licenses package, integrate it into navigation, and manage licenses via an auto-generated oss_licenses.dart file.

New Features:

• Add Software Licenses screen listing all dependencies and their licenses

Enhancements:

• Replace hard-coded “Open Source Licenses” label with a constant and refine navigation logic to reuse existing routes

Build:

• Add flutter_oss_licenses package and auto-generate oss_licenses.dart file

Chores:

• Register new '/softwareLicenses' route and update navigation drawer entry

[sourcery-ai]

Reviewer's Guide

This PR integrates the flutter_oss_licenses package to auto-generate an OSS licenses listing, implements a dedicated Software Licenses screen with routing and UI to display licenses, and updates the navigation drawer (and constants) to include and navigate to the new screen.

File-Level Changes

Change	Details	Files
Integrate OSS license generator	Add flutter_oss_licenses dependency in pubspec.yaml Generate oss_licenses.dart via the package tool Commit generated license data file without manual edits	pubspec.yaml lib/oss_licenses.dart
Implement SoftwareLicensesScreen and routing	Create SoftwareLicensesScreen widget with license loading logic Add loadLicenses helper using LicenseRegistry Register '/softwareLicenses' route in main.dart	lib/view/software_licenses_screen.dart lib/main.dart
Update navigation drawer and constants	Import constants and replace hard-coded title with softwareLicenses Enhance onTap to handle pushNamedAndRemoveUntil navigation Define softwareLicenses string in constants.dart	lib/view/widgets/navigation_drawer.dart lib/constants.dart

Possibly linked issues

• #0: PR adds a software licenses screen using flutter_oss_licenses to list dependencies and their licenses, directly fixing the issue.

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[github-actions]

Build successful. APKs to test: https://github.com/fossasia/pslab-android/actions/runs/15128672405/artifacts/3156791062

[AsCress]

LGTM @Vidhijain20 !