feat: add pin layouts

[AsCress]

Fixes #2899
Adds pin layouts for PSLab V5 and V6.

Summary by Sourcery

Introduce front/back pin layout support by adding stub screen, menu options, and localization entries.

New Features:

• Add PinLayoutScreen stub to display pin layouts
• Add "Pin Layout Front" and "Pin Layout Back" options to the app bar menu

Enhancements:

• Inject AppLocalizations via the service locator in MainScaffold

Documentation:

• Add localization keys pinLayoutFront and pinLayoutBack and translations across all supported locales

[sourcery-ai]

Reviewer's Guide

Introduces a pin layout feature by adding a popup menu in the app bar to select front/back layouts, defines new localization keys for these options in all supported languages, and scaffolds a placeholder screen for the pin layout.

File-Level Changes

Change	Details	Files
Replace hardcoded menu icon with a localized popup menu for pin layout selection	Import AppLocalizations and locator Retrieve AppLocalizations instance via getIt Swap IconButton for PopupMenuButton with pinLayoutFront and pinLayoutBack items	lib/view/widgets/main_scaffold_widget.dart
Add new localization keys for pin layout labels	Declare pinLayoutFront and pinLayoutBack in AppLocalizations base Implement getters in each language-specific file	lib/l10n/app_localizations.dart lib/l10n/app_localizations_de.dart lib/l10n/app_localizations_en.dart lib/l10n/app_localizations_es.dart lib/l10n/app_localizations_fr.dart lib/l10n/app_localizations_he.dart lib/l10n/app_localizations_hi.dart lib/l10n/app_localizations_id.dart lib/l10n/app_localizations_ja.dart lib/l10n/app_localizations_nb.dart lib/l10n/app_localizations_pt.dart lib/l10n/app_localizations_ru.dart lib/l10n/app_localizations_uk.dart lib/l10n/app_localizations_vi.dart lib/l10n/app_localizations_zh.dart
Scaffold a new PinLayoutScreen widget	Create PinLayoutScreen StatefulWidget Add empty Container in build method	lib/view/pin_layout_screen.dart

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#2899	Fix the top right 3-dot dropdown so that it works on Android.	✅
#2899	Show a dropdown with the different available hardware versions of PSLab with front and back options.	✅

Possibly linked issues

• Top right 3dot dropdown not working #2899: The PR adds new pin layout screens for PSLab V5 and V6, which directly resolves the issue.

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[github-actions]

Build Status

Build successful. APKs to test: https://github.com/fossasia/pslab-app/actions/runs/18295197597/artifacts/4197519974.

Screenshots

Android Screenshots

iPhone Screenshots

iPad Screenshots