feat(web): focus search bar input when using explore shortcut "/"

[daniele-athome]

This PR will focus the search bar when using the explore (actually search) shortcut as in Google Photos.

The code needs a serious review because I have little to no experience with Svelte - I started exploring it with Immich - and I don't know if this is the right approach. Mainly it's about communicating from asset-grid (which receives the keydown event) to search-bar which involves traversing the component tree in a weird way. Maybe there should be some refactoring, i.e. "global" shortcuts like this one should be handled in a proper parent (very high in the tree) component? If someone would point me to the right direction I'll be glad to implement this in a different way.

How was this tested?

• [x] clicking "Explore" link normally does not focus the search bar
• [x] typing "/" from an asset grid will focus the search bar after navigating into the explore page

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1 Ignored Deployment

Name	Status	Preview	Comments	Updated (UTC)
immich	⬜️ Ignored (Inspect)	Visit Preview		Sep 30, 2023 9:21am

[danieldietzler]

#8630