fix: RTL layout navigation (#327) & content language cache invalidation

[Himanth-reddy]

Summary of Changes

Fixes Issue #327 (RTL Scrolling Issue) and addresses content language caching reactivity.

Fixes Implemented:

1. RTL Navigation & Layout Direction (Fixes RTL Scrolling Issue #327):

   • Corrected animateHomeScrollDelta calculation in HomeScreen.kt to adjust scroll delta direction when LocalLayoutDirection is Rtl.
   • Removed hardcoded LayoutDirection.Ltr wrapper on TV hero overlay in HomeScreen.kt to allow native RTL alignment.
   • Replaced hardcoded Hebrew strings for Top 10 category titles in HomeScreen.kt with localized string resources.

2. Content Language & Cache Invalidation:

   • Fixed TMDB API language parameter across MediaRepository, SettingsViewModel, HomeViewModel, and MainActivity to explicitly send "en-US" instead of null when English is selected.
   • Added contentLanguage tracking in HomeProfilePreferences.kt and HomeViewModel.kt so language changes trigger instant in-memory and disk cache clearing (clearMediaCache()) and re-fetch catalog rows.

---

🔍 Observed Issues & Open Edge Cases (Help Needed)

While resolving Issue #327 and testing language switching, the following 6 localization & caching edge cases were observed:

1. Poster Title Updates: When language is changed in Settings, titles on already loaded posters on the Home screen do not update dynamically without a full app restart.
2. Addon / Sports Catalogs: Poster titles below the Sports section (third-party Stremio Addon catalogs) do not update when Content Language is changed.
3. Details Screen Missing Titles: If a title translation does not exist in the requested language, the Details screen occasionally renders an empty title string.
4. Original Language Fallback vs English: Untranslated poster titles fall back to originalTitle (e.g. Japanese, French, Hindi) instead of defaulting to English (en-US).
5. Hebrew Top 10 Movies: Top 10 Movies category fails to load when Content Language is set to Hebrew (he/iw).
6. Catalog Architecture Difference: Catalogs positioned below the Sports section behave differently from TMDB built-in categories above the Sports section.

Request:

The core RTL scrolling bug (#327) is resolved. Contributors or team members are welcome to assist with or investigate the 6 localization & addon catalog observations listed above.