fix: missing themedContext getter causes compilation errors

[kirillzyusko]

📜 Description

Use getter for themedContext explicitly. Don't rely on auto-getters anymore.

💡 Motivation and Context

Closes #1489

📢 Changelog

Android

• explicitly use getThemedContext getter;

🤔 How Has This Been Tested?

Tested via CI. Old RN versions works as expected.

📸 Screenshots (if appropriate):

📝 Checklist

• CI successfully passed
• I added new mocks and corresponding unit-tests if library API was changed

[github-actions]

📊 Package size report

Current size	Target Size	Difference
318458 bytes	318366 bytes	92 bytes 📈

[github-actions]

1. Incorrect Method Call for Themed Context
   Why: The code incorrectly calls getThemedContext() which may not be a valid method, leading to runtime errors if it doesn't exist.
   Fix: Replace getThemedContext().getDisplaySize() with the original themedContext.getDisplaySize().

[cortinico]

Thanks for fixing this 🙏

[kirillzyusko]

@cortinico do you need a new release? Will the current release without these changes block/break upcoming RN 0.86 release?

[cortinico]

@cortinico do you need a new release? Will the current release without these changes block/break upcoming RN 0.86 release?

If you could make a new release it would be gold as it would render the nightlies green here: https://react-native-community.github.io/nightly-tests/

This is also not going to affect users on <= 0.86 but only on 0.87+ so not super urgent 👍

[cortinico]

Also this is backward compatible, so you should be able to merge it and should not impact existing users