Add a public-decks tab that lists decks published by other users using the
server's deck visibility feature, previewing each deck's banner card, color
identity, tags and upload time without downloading the deck list until the
user opens it.
- Add a public-decks tab with a shared-settings widget and a remote model
that fetches the target user's decks and refreshes both automatically and
on user request, with a loading indicator and a server-error message
instead of a blank tab when the fetch fails or the connection drops
- Render each deck as a focusable preview tile whose banner, color identity,
tags and upload time follow the existing Preview settings, with the deck
name announced as the tile's accessible name and Space/Enter opening the
deck, mirroring the shared-deck preview tile
- Show a message box when opening a public deck fails or arrives corrupted
- Publish and unpublish decks from the server storage toolbar and context
menu, toggling the deck's own visibility bit (what the server persists)
rather than the inherited effective state, and batch the visibility
refresh until the last in-flight change is acknowledged
- Add the Show Upload Time setting so the tile's upload stamp can be hidden
like the other preview details
- Update the retranslateUi wiring for the new public-decks tab and rename
the share action tooltip from "Deck share" to "Share link"
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