Add library toggler

[kevincador]

Summary

Adds a shared Library toggler for switching between Plex and Custom Library.

• Replaces the profile Library dropdown with the shared trakt-toggler
• Adds the same toggler to /users/me/library
• Keeps the full Library page mode reflected in ?library=plex|other
• Adds a CustomLibraryIcon and maps Plex/Custom icons in the toggler
• Shows the active library mode as metadata while keeping the toggler icon-only

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a unified Library toggler component to replace the existing dropdown implementation. The change streamlines the user experience for switching between Plex and Custom library views across the application, ensuring consistent state management and visual representation.

Highlights

• Library Toggler Integration: Replaced the profile Library dropdown with a shared LibraryToggler component to provide a consistent UI for switching between Plex and Custom library modes.
• Expanded Toggler Functionality: Implemented the LibraryToggler across both the main library list and the user library page, ensuring that the active library mode is correctly reflected in the UI and URL parameters.
• UI/UX Enhancements: Added a CustomLibraryIcon and updated internal components to support dynamic icon mapping and metadata display for the active library mode.

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[gemini-code-assist]

Code Review

This pull request refactors the library selection UI by replacing the LibraryDropdown with a new LibraryToggler component, utilizing the project's standardized toggler system. Changes include defining a new 'library' toggler type, adding corresponding icons, and updating the library list and user library pages to support this new interaction pattern. The reviewer recommended replacing hardcoded 'Plex' strings with translation keys in the toggler constants and translation utilities to ensure consistency with the project's localization standards.

[gemini-code-assist]

The string 'Plex' is hardcoded. To maintain consistency with the internationalization (i18n) standards of the project and to allow for potential localization, please use a translation key from the messages file, similar to how the other option is handled.

Suggested change

	text: () => 'Plex',
	label: () => 'Plex',
	text: m.translated_value_library_plex,
	label: m.translated_value_library_plex,

[seferturan]

@gemini-code-assist, plex is a brand name, it doesn't need to be translated.

[gemini-code-assist]

You are correct that 'Plex' is a brand name and generally does not require translation. Thank you for the clarification.

[gemini-code-assist]

The string 'Plex' is hardcoded here as well. Please use the corresponding translation key to ensure all user-facing strings are localized.

Suggested change

	plex: () => 'Plex',
	plex: m.translated_value_library_plex,

[seferturan]

@gemini-code-assist, plex is a brand name, it doesn't need to be translated.

[gemini-code-assist]

You are correct, 'Plex' is a brand name and does not require translation. Thank you for the clarification.

[seferturan]

I like having this in a toggler :D

The icon used for Plex is the one we also use as the generic Library icon in the sidebar. Maybe we could make some better icons here; for Plex something with their > logo? And ideally also a better icon for the custom one, but I have no inspiration atm for that 😅
@ElMagnea, thoughts?

[SebastianRasch]

This is so cool with the Gemini code assist, makes implementing changes like this so much easier and faster!