improve ui on keydetailview

add set(keypair, onHost) to set a keypair on host
remove getkeys it always returns []
add delete button to
remove rsa from keytype
rename symbolpreview ->hostsymbolpreview

ShhShell/Views/Misc/HostSymbolPreview.swift

@@ -0,0 +1,34 @@
+//
+//  HostSymbolPreview.swift
+//  ShhShell
+//
+//  Created by neon443 on 26/06/2025.
+//
+
+import SwiftUI
+
+struct HostSymbolPreview: View {
+	@State var symbol: HostSymbol
+	@State var label: String
+	
+    var body: some View {
+		ZStack(alignment: .center) {
+			if symbol.isCustom {
+				Image(symbol.sf)
+					.resizable().scaledToFit()
+					.symbolRenderingMode(.monochrome)
+			} else {
+				Image(systemName: symbol.sf)
+					.resizable().scaledToFit()
+					.symbolRenderingMode(.monochrome)
+			}
+			Text(label)
+				.font(.headline)
+				.offset(symbol.offset)
+		}
+    }
+}
+
+#Preview {
+	HostSymbolPreview(symbol: HostSymbol.desktopcomputer, label: "lo0")
+}