add support for vertical padding in styles

Sources/phbar/Models/PHTheme/PHThemeStyle.swift

@@ -10,7 +10,7 @@ struct PHThemeStyle: Decodable {
 			name: "_default",
 			foreground: .init(color: "#000000", alpha: nil),
 			background: .init(color: "#ffffff", alpha: nil),
-			padding: .init(leading: 12, trailing: 12),
+			padding: .init(top: 0, bottom: 0, leading: 12, trailing: 12),
 			corner: nil
 		)
 	}()

Sources/phbar/Models/PHTheme/PHThemeStyle/PHThemeStylePadding.swift

@@ -1,8 +1,12 @@
 struct PHThemeStylePadding: Decodable {
+	let top: Double?
+	let bottom: Double?
 	let leading: Double?
 	let trailing: Double?
 
 	private enum CodingKeys: String, CodingKey {
+		case top
+		case bottom
 		case leading = "left"
 		case trailing = "right"
 	}

Sources/phbar/Views/TextView.swift

@@ -33,6 +33,8 @@ struct TextView: View {
 				}
 				.padding(.trailing, block.style.padding?.trailing ?? 0)
 				.padding(.leading, block.style.padding?.leading ?? 0)
+				.padding(.top, block.style.padding?.top ?? 0)
+				.padding(.bottom, block.style.padding?.bottom ?? 0)
 			}
 			.fixedSize(horizontal: true, vertical: false)
 			.border(block.debug ? .red : .clear)