fix(apple/iOS): stock header + edge-aligned host grid — drop the custom title mode

The "title looks off" report traced to the GRID, not the title: the Mac-tuned
adaptive(180–240) columns yielded a single max-width card, centered, so nothing aligned
with the leading large title. The header is now entirely stock primitives — default
.navigationTitle large-title behavior (the inlineLarge experiment is gone), default
.padding() so content sits on the system 16 pt margins — and the grid columns are
platform-tuned: iOS drops the max so columns FILL the width and the cards stay
edge-aligned with the title; macOS keeps the 180–240 cap (huge windows shouldn't grow
huge cards).

Verified in the iPhone 17 simulator with seeded hosts: pill top-right, large title at
system metrics, two full-width-filling cards flush with the title's leading edge.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

clients/apple/Sources/PunktfunkClient/ContentView.swift

@@ -90,24 +90,16 @@ struct ContentView: View {
                     emptyState
                 } else {
                     ScrollView {
-                        LazyVGrid(
-                            columns: [GridItem(.adaptive(minimum: 180, maximum: 240), spacing: 16)],
-                            spacing: 16
-                        ) {
+                        LazyVGrid(columns: gridColumns, spacing: 16) {
                             ForEach(store.hosts) { host in
                                 hostCard(host)
                             }
                         }
-                        .padding(20)
+                        .padding()
                     }
                 }
             }
             .navigationTitle("punktfunk")
-            #if os(iOS)
-            // Liquid-glass header: the large title shares the bar row with the action
-            // circles instead of stacking under them.
-            .toolbarTitleDisplayMode(.inlineLarge)
-            #endif
             .toolbar {
                 #if os(iOS)
                 // Adjacent trailing items share one glass pill (the system default).
@@ -157,6 +149,16 @@ struct ContentView: View {
         }
     }
 
+    /// macOS caps card width (a huge window shouldn't yield huge cards); on iOS the
+    /// columns FILL the width so the cards stay edge-aligned with the title and bars.
+    private var gridColumns: [GridItem] {
+        #if os(macOS)
+        [GridItem(.adaptive(minimum: 180, maximum: 240), spacing: 16)]
+        #else
+        [GridItem(.adaptive(minimum: 160), spacing: 16)]
+        #endif
+    }
+
     private var addHostButton: some View {
         Button {
             showAddHost = true