fix(about): About Outpost opens Settings' About section, no popup window

"About Outpost" in the app menu used to open a separate standalone
window (Window(id: "about") wrapping AboutView). Now just opens Settings
and jumps straight to the About section instead — same content
(AboutInfoView, unchanged), one less window/code path to maintain.

Also removed the "Check for Updates…" button — deferred per explicit
instruction, not deleted for a real reason beyond "not now." A simple
button can come back later; no update-checking logic was ever built; ,
nothing else to clean up alongside it.

Outpost/Features/About/AboutView.swift

@@ -2,13 +2,11 @@
 import AppKit
 import SwiftUI
 
-/// Bare content (icon, name, version, links) with no window chrome — reused
+/// Bare content (icon, name, version, links) with no window chrome — the
-/// by both the standalone "About Outpost" window (`AboutView`, the standard
+/// macOS "About Outpost" app-menu command now opens Settings' own About
-/// macOS app-menu affordance) and the Settings page's own About section, so
+/// section directly (no separate popup window), so this is its only caller.
-/// the two can't drift out of sync.
 struct AboutInfoView: View {
     private let repositoryURL = URL(string: "https://git.psmattas.com/psmattas/Outpost")!
-    private let releasesURL = URL(string: "https://git.psmattas.com/psmattas/Outpost/releases")!
 
     var appName: String {
         Bundle.main.object(forInfoDictionaryKey: "CFBundleName") as? String ?? "Outpost"
@@ -45,35 +43,15 @@ struct AboutInfoView: View {
                 .fixedSize(horizontal: false, vertical: true)
                 .frame(maxWidth: .infinity)
 
-            VStack(spacing: 10) {
             Link(destination: repositoryURL) {
                 Label("View Source on Git", systemImage: "link")
             }
             .font(.callout)
 
-                Button("Check for Updates…") {
-                    checkForUpdates()
-                }
-            }
-
             Text("© \(copyrightYear) Puranjay Savar Mattas")
                 .font(.caption2)
                 .foregroundStyle(.tertiary)
         }
     }
-
-    // No Sparkle-style in-app updater yet — this just opens the releases page
-    // on the self-hosted Gitea instance so the user can check/download manually.
-    private func checkForUpdates() {
-        NSWorkspace.shared.open(releasesURL)
-    }
-}
-
-struct AboutView: View {
-    var body: some View {
-        AboutInfoView()
-            .padding(32)
-            .frame(width: 320)
-    }
 }
 #endif

Outpost/OutpostApp.swift

@@ -18,7 +18,6 @@ struct OutpostApp: App {
     @AppStorage("outpost.appearance") private var appearance: AppAppearance = .system
 
     #if os(macOS)
-    @Environment(\.openWindow) private var openWindow
     @State private var isShowingLogoutConfirmation = false
     #endif
 
@@ -40,7 +39,8 @@ struct OutpostApp: App {
         .commands {
             CommandGroup(replacing: .appInfo) {
                 Button("About Outpost") {
-                    openWindow(id: "about")
+                    navigation.selectedSettingsSection = .about
+                    navigation.isShowingSettings = true
                 }
             }
             // No `Settings {}` scene anymore — Settings renders inside the
@@ -64,12 +64,6 @@ struct OutpostApp: App {
         #endif
 
         #if os(macOS)
-        Window("About Outpost", id: "about") {
-            AboutView()
-                .disablesFullScreen()
-        }
-        .windowResizability(.contentSize)
-
         Window("Keyboard Shortcuts", id: "keyboard-shortcuts") {
             KeyboardShortcutsView()
                 .disablesFullScreen()