Collapse the popover's settings into expandable cards

CHANGELOG.md

@@ -7,6 +7,13 @@ expect rough edges until 1.0.
 ## [Unreleased]
 
 ### Changed
+- **The popover is shorter: settings below DPI collapse.** Polling rate, Lighting, Power
+  Management, Buttons and Profiles are now compact cards of one row each, each showing
+  its current value ("1000 Hz", "Static · 80%", the active profile). Click a row to open its
+  controls in place; open as many as you like, and the popover remembers which. Battery and DPI
+  stay open at the top, since they're what you check most. The battery and lighting tips now
+  appear only inside their open section, not on the main page all the time.
+
 - **The popover behaves more like a native Mac panel.** Esc on a sub-page (Colour, Buttons,
   Battery Usage, Profiles, What's New) now goes back one level instead of closing the whole
   popover, and every sub-page uses the same Back button, What's New included. ⌘R refreshes and

Sources/MacRazer/CardComponents.swift

@@ -6,10 +6,18 @@ import SwiftUI
 /// Control-Center-style tile: a rounded, lightly-frosted card on the dark popover. Shared by
 /// every popover sub-page so the card style can't drift between them.
 func card<Content: View>(@ViewBuilder _ content: () -> Content) -> some View {
-    content()
+    cardSurface(content()
         .padding(12)
-        .frame(maxWidth: .infinity, alignment: .leading)
-        .background(Color.primary.opacity(0.10), in: RoundedRectangle(cornerRadius: 13))
+        .frame(maxWidth: .infinity, alignment: .leading))
+}
+
+/// The card's fill and shape without its padding, for cards that lay out their own insets (the
+/// popover's expandable section rows).
+///
+/// A free function like `card`, not a `View` extension: an extension method is main-actor
+/// isolated, and `card` (nonisolated) couldn't call it under Swift 6 concurrency checking.
+func cardSurface<Content: View>(_ content: Content) -> some View {
+    content.background(Color.primary.opacity(0.10), in: RoundedRectangle(cornerRadius: 13))
 }
 
 /// A card with a small uppercase heading — the window-sized counterpart to `card`, shared by