feat / improve up-next experience

[vladjerca]

This pull request, a meticulous orchestration of code refinement, breathes new life into the episode components, enhancing their internationalization and data management capabilities. Observe the subtle dance of improvement as we delve into the depths of these enhancements.

Enhancements to Episode Components:

• The EpisodeIntl interface, a lexicon of episode-related terminology, expands its vocabulary, adding durationText and remainingText methods to its repertoire. These additions pave the way for a more nuanced and localized presentation of episode information.
• The EpisodeIntlProvider, a purveyor of internationalized episode data, embraces the new methods, weaving them into its implementation with toHumanDuration and other temporal enchantments.
• The EpisodeCover.svelte component, a canvas for episode presentation, adorns itself with i18n and type props, further enhancing its ability to adapt to diverse linguistic and stylistic preferences. It now gracefully incorporates finaleText and premiereText, adding a touch of localized flair.

Refactoring of Up Next and Upcoming Episodes:

• The UpNextEpisode.svelte component, a harbinger of anticipation, sheds its reliance on direct calls to m.remaining_episodes and toHumanDuration, instead embracing the elegance of i18n methods. This transformation streamlines its code and enhances its adaptability.
• The UpcomingEpisode.svelte component, a herald of future viewing delights, undergoes a similar transformation, discarding the direct usage of EpisodeFinaleTag and EpisodePremiereTag in favor of the more versatile i18n and type props.

Additions to Episode Data Management:

• The upcomingEpisodes.ts script, a chronicler of future episodes, enriches its EpisodeEntry with id fields, ensuring the accurate identification of each episode in the temporal stream.
• The upNext.ts script, a purveyor of immediate viewing suggestions, refines its UpNextEntry type, extending it with EpisodeEntry and adding type and airedDate fields for a more comprehensive representation of upcoming episodes.

Introduction of Episode Store:

• The useEpisodeStore.ts function emerges, a guardian of episode data, wielding the power of Svelte stores to manage and manipulate this valuable information.
• A rigorous battery of tests, enshrined in useEpisodeStore.spec.ts, validates the functionality of this new store, ensuring its reliability and resilience.

These enhancements, a testament to the pursuit of code elegance and user delight, elevate the episode components to new heights of sophistication. With improved internationalization and streamlined data management, Trakt Lite continues its journey towards a more refined and user-centric experience.