feat: Begins room-pressure calculator

Sources/Styleguide/Buttons.swift

@@ -1,5 +1,41 @@
 import Elementary
 
+public struct PrimaryButton: HTML, Sendable {
+  let label: String
+
+  public init(label: String) {
+    self.label = label
+  }
+
+  public var content: some HTML<HTMLTag.button> {
+    button(
+      .class("""
+        font-bold py-2 px-4 transition-colors
+        bg-blue-500 enabled:hover:bg-blue-600
+        text-yellow-300
+      """)
+    ) { label }
+  }
+}
+
+public struct SecondaryButton: HTML, Sendable {
+  let label: String
+
+  public init(label: String) {
+    self.label = label
+  }
+
+  public var content: some HTML<HTMLTag.button> {
+    button(
+      .class("""
+        font-bold py-2 px-4 transition-colors
+        bg-yellow-300 enabled:hover:bg-yellow-400
+        text-blue-600
+      """)
+    ) { label }
+  }
+}
+
 public struct SubmitButton: HTML, Sendable {
   let label: String