WIP: Sidebar improvements, working on other views.

Sources/Styleguide/Number.swift

@@ -0,0 +1,31 @@
+import Elementary
+import Foundation
+
+public struct Number: HTML, Sendable {
+  let fractionDigits: Int
+  let value: Double
+
+  private var formatter: NumberFormatter {
+    let formatter = NumberFormatter()
+    formatter.maximumFractionDigits = fractionDigits
+    return formatter
+  }
+
+  public init(
+    _ value: Double,
+    digits fractionDigits: Int = 2
+  ) {
+    self.value = value
+    self.fractionDigits = fractionDigits
+  }
+
+  public init(
+    _ value: Int
+  ) {
+    self.init(Double(value), digits: 0)
+  }
+
+  public var body: some HTML<HTMLTag.span> {
+    span { formatter.string(for: value) ?? "N/A" }
+  }
+}