Added App close confirmation dialog to fix #18

[adeeteya]

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Now there is a Confirmation Dialog which asks the user whether he is sure he want to exit the app or not.

[Copilot]

Pull Request Overview

Added an app close confirmation dialog to address issue #18, improving user experience by preventing accidental app exits.

• Implemented exit confirmation dialog using PopScope widget with custom confirmation logic
• Added new localization strings for the confirmation dialog title and content
• Updated internationalization files to support the new confirmation dialog text

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
lib/home.dart	Added PopScope wrapper and exit confirmation dialog implementation
lib/l10n/app_en.arb	Added English localization strings for exit confirmation dialog
untranslated_messages.json	Marked new localization keys as needing translation for all supported languages
android/app/src/main/AndroidManifest.xml	Enabled predictive back gesture support for Android
lib/widgets/MarkdownTextInput/markdown_text_input.dart	Code formatting improvements (unrelated to main feature)
lib/widgets/MarkdownTextInput/format_markdown.dart	Code formatting improvements (unrelated to main feature)
lib/main.dart	Code formatting improvements (unrelated to main feature)

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