Share a card's image from the preview

A share button beside the preview's close button sends the face being
shown at Scryfall's large size: on desktop the image is decoded and put on
the clipboard (tauri-plugin-clipboard-manager); on Android it's saved to
the cache and handed to the system share sheet by a small in-repo plugin
(SharePlugin.kt) through the app's FileProvider. The preview's corner
buttons are also a little larger.

src/api.ts

@@ -508,6 +508,9 @@ export const api = {
     isCommander = false,
     isMaybeboard = false,
   ) => invoke<void>("set_deck_card", { deckId, oracleId, quantity, isCommander, isMaybeboard }),
+  /** Copy (desktop) or share (Android) a card image; says which happened. */
+  shareCardImage: (url: string, name: string) =>
+    invoke<"copied" | "shared">("share_card_image", { url, name }),
   deckContents: (deckId: number) => invoke<DeckEntry[]>("deck_contents", { deckId }),
   suggestCards: (deckId: number, offset = 0, options: { unusual?: boolean; owned_only?: boolean } = {}) =>
     invoke<CardSuggestion[]>("suggest_cards", { deckId, offset, options }),