ProdDash Viewer 1.0.0: a Mac app that only shows ProdDash, with a tab per installation

A new Apple-silicon app in viewer/macos (Swift, no dependencies, ~1 MB): one
window showing a ProdDash dashboard in WebKit, and nothing else. It runs no
server; it points at any ProdDash on the network.

- Connections (name + address) in Settings; the add/edit sheet asks
  /api/modules whether ProdDash answers as you type. No port means 24500.
- Two or more connections bring a slim tab bar of their names. In a window
  it floats over the dashboard and comes out while the pointer is on the
  title bar; it is not part of the title bar, because anything there makes
  WebKit push the page down. In full screen it is a titlebar accessory that
  comes down with the menu bar, and it flashes up after each switch.
  ⌃Tab / ⌃⇧Tab and ⌘1–9 switch from the keyboard.
- Full screen, reopening in full screen if it quit there; window size and
  the selected tab are kept too. The dashboard's own full-screen button
  works as well.
- Menus: View (Back, Forward, Reload Page, Enter Full Screen), Settings,
  Edit (copy/paste in the page's text fields), Window, Help (a guide that
  ships in the app).
- Every installation keeps its own live web view. One that can't be
  reached says why and retries at 2, 4, 8, then every 15 s; a redirect off
  the installation is reported, not handed to the browser. JS alert,
  confirm and prompt show as sheets; links to other sites open in the
  browser.
- General settings: open at login (SMAppService), keep the display awake
  while a dashboard is on screen (default on).

build.sh signs with the Developer ID when one is installed and makes a
notarised DMG with --notarize, as the launcher's does. It needs Xcode: with
only the command line tools the macOS 27 SDK can't expand SwiftUI's @State.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

viewer/macos/Sources/HelpWindowController.swift

@@ -0,0 +1,42 @@
+import AppKit
+import WebKit
+
+/// Help → ProdDash Viewer Help: the page that ships inside the app, so it
+/// opens with no network and always matches this version.
+final class HelpWindowController: NSWindowController, WKNavigationDelegate {
+
+    convenience init() {
+        let web = WKWebView()
+        let window = NSWindow(
+            contentRect: NSRect(x: 0, y: 0, width: 640, height: 720),
+            styleMask: [.titled, .closable, .miniaturizable, .resizable],
+            backing: .buffered, defer: false)
+        window.title = "ProdDash Viewer Help"
+        window.minSize = NSSize(width: 420, height: 360)
+        window.contentView = web
+        window.tabbingMode = .disallowed
+        window.isRestorable = false
+        window.center()
+        window.setFrameAutosaveName("ProdDashViewerHelp")
+        self.init(window: window)
+        web.navigationDelegate = self
+        if let page = Bundle.main.url(forResource: "index", withExtension: "html", subdirectory: "Help") {
+            web.loadFileURL(page, allowingReadAccessTo: page.deletingLastPathComponent())
+        }
+    }
+
+    func show() {
+        showWindow(nil)
+        window?.makeKeyAndOrderFront(nil)
+    }
+
+    /// The help page itself stays here; its links to the web open in the browser.
+    func webView(_ webView: WKWebView, decidePolicyFor action: WKNavigationAction,
+                 decisionHandler: @escaping (WKNavigationActionPolicy) -> Void) {
+        guard let url = action.request.url, !url.isFileURL, url.scheme != "about" else {
+            return decisionHandler(.allow)
+        }
+        NSWorkspace.shared.open(url)
+        decisionHandler(.cancel)
+    }
+}