feat: Added FAQ page

[Yugesh-Kumar-S]

feat: Ported FAQ as part of issue #2698

Changes

• Implemented the FAQ route with questions in the PSLab flutter app

Screenshots / Recordings

Screen.Recording.2025-05-23.000016.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.

Summary by Sourcery

Add a fully functional FAQ page to the app, complete with data model, UI layout, routing, and external link support.

New Features:

• Add FAQ screen with expandable question-answer list and tappable external links
• Introduce FAQItem model to encapsulate FAQ entries with optional links
• Register /faq route and integrate navigation entry in the main drawer

Enhancements:

• Use MainScaffold and ListView.separated for consistent FAQ layout and theming
• Implement URL launching for FAQ links
• Update navigation drawer to handle routing to the FAQ screen gracefully

[sourcery-ai]

Reviewer's Guide

Introduces a new FAQ page implemented as a stateless widget that loads a static list of question–answer items with optional links via ExpansionTiles, adds URL launch support, and integrates the new screen into the app’s route map and navigation drawer.

File-Level Changes

Change	Details	Files
Implemented the FAQScreen UI with dynamic content and link handling	Imported Material, custom colors, constants, MainScaffold widget, and url_launcher library Defined FAQItem model and static list of FAQs with question, answer, and optional link fields Replaced unimplemented build method to render MainScaffold containing a ListView of ExpansionTiles Created private _buildFAQItem and _launchURL methods for rendering Q/A rows and opening external URLs	lib/view/faq_screen.dart
Integrated the FAQ page into app navigation	Updated navigation_drawer.dart to handle tap on FAQ entry with proper push/pop to '/faq' Added '/faq' route mapping in main.dart’s routes table Cleaned up import ordering and whitespace in main.dart	lib/view/widgets/navigation_drawer.dart lib/main.dart

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[github-actions]

Build successful. APKs to test: https://github.com/fossasia/pslab-android/actions/runs/15237997599/artifacts/3192989809