feat(ui): use a book-open icon for the card read action

Swaps the play (triangle) icon for book-open on book cards, since the
action is to start reading rather than play media.

templates/dashboard.templ

@@ -144,7 +144,7 @@ templ BookCard(item handlers.BookInfo) {
 					aria-label={ "Resolve progress conflict for " + item.Title }
 					title="Resolve progress conflict"
 				>
-					@Icon("play", "h-5 w-5 translate-x-0.5")
+					@Icon("book-open", "h-5 w-5")
 				</a>
 			} else {
 				<a
@@ -153,7 +153,7 @@ templ BookCard(item handlers.BookInfo) {
 					aria-label={ "Read " + item.Title }
 					title="Read"
 				>
-					@Icon("play", "h-5 w-5 translate-x-0.5")
+					@Icon("book-open", "h-5 w-5")
 				</a>
 			}
 		</div>