fix(app): use .unified instead of .unifiedCompact toolbar style

.unifiedCompact is a genuinely shorter toolbar height, not "unified
minus the title" — that's what made the toolbar look slim and likely
squeezed the custom navigation item too. .unified(showsTitle: false)
hides the native title without changing the toolbar's height.

Outpost/OutpostApp.swift

@@ -40,7 +40,9 @@ struct OutpostApp: App {
         // the same collection/document name, it visibly duplicated, with the
         // system back button sandwiched between the two. `.navigationTitle`
         // stays set (for the Window menu / Mission Control), just hidden here.
-        .windowToolbarStyle(.unifiedCompact(showsTitle: false))
+        // `.unified` (not `.unifiedCompact`) keeps the toolbar at normal
+        // height — compact is a shorter style, not merely "unified minus title".
+        .windowToolbarStyle(.unified(showsTitle: false))
         .commands {
             CommandGroup(replacing: .appInfo) {
                 Button("About Outpost") {