fix(client/apple): the add-host sheet was Mac-sized on iPhone, and clipped its own pins

Two things, one cause: the sheet was written as a Mac panel and iOS inherited it.

The 12pt Geist and `.controlSize(.small)` exist because a grouped form's system text
reads oversized next to the app's typography in a Mac panel. Applied to iOS as well,
they made this the one sheet in the app you had to squint at — a touch target and a
field label there are not a Mac panel's. macOS keeps them; iOS keeps the app's body
size.

And the sheet's height was a single hardcoded number with scrolling switched off, so
expanding "Pinned cards" grew content into a height nobody recomputed and the toggles
were simply clipped — the disclosure looked broken because there was nowhere for it
to go. The height now follows what the sheet is showing (base fields, the picker when
profiles exist, the toggles while expanded, which is why the disclosure's expansion is
bound state now), scrolling is back on so nothing can be stranded, and `.large` is
offered alongside for the accessibility text sizes these estimates won't cover.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

clients/apple/Sources/PunktfunkClient/Home/AddHostSheet.swift

@@ -29,6 +29,9 @@ struct AddHostSheet: View {
     /// independent of the default above.
     @State private var pinnedIDs: Set<String>
     @ObservedObject private var profiles = ProfileStore.shared
+    /// Bound rather than left to the disclosure itself: on iOS the sheet's height is computed
+    /// from what it shows, and an expansion the sheet doesn't know about is one it clips.
+    @State private var pinsExpanded = false
     #endif
     #if os(macOS)
     /// Share the clipboard with this host (macOS sessions only; design
@@ -126,14 +129,15 @@ struct AddHostSheet: View {
             }
             #if !os(tvOS)
             .formStyle(.grouped)
-            // The grouped form's default system text is oversized next to the app's Geist
-            // typography — bring it down and on-brand so the panel doesn't read out of place.
+            #endif
+            #if os(macOS)
+            // macOS ONLY: the grouped form's default system text is oversized next to the app's
+            // Geist typography, so the panel reads out of place at full size. iOS keeps the app's
+            // body size — a touch target and a field label there are not a Mac panel's, and 12pt
+            // made this the one sheet in the app you had to squint at.
             .font(.geist(12, relativeTo: .callout))
             .controlSize(.small)
             #endif
-            #if os(iOS)
-            .scrollDisabled(true)
-            #endif
             #if os(macOS)
             HStack {
                 Button("Cancel", role: .cancel) { dismiss() }
@@ -157,9 +161,9 @@ struct AddHostSheet: View {
             #endif
         }
         #if os(iOS)
-        // Four fields + the action row — a touch taller than the 3-field add sheet used to be,
-        // and taller again once there are profiles to bind and pin.
-        .presentationDetents([.height(profiles.profiles.isEmpty ? 392 : 480)])
+        // The sheet follows what it is actually showing (see `sheetHeight`), and `.large` is
+        // always reachable so a large Dynamic Type size can never strand the action row.
+        .presentationDetents([.height(sheetHeight), .large])
         .presentationDragIndicator(.visible)
         #endif
         #if os(macOS)
@@ -169,6 +173,25 @@ struct AddHostSheet: View {
         #endif
     }
 
+    #if os(iOS)
+    /// The sheet's height, derived from what it is actually showing rather than pinned to one
+    /// number: the four base fields plus the action row, the Profile picker when there are
+    /// profiles to pick, and the pin toggles while they are expanded.
+    ///
+    /// A fixed detent is what clipped the expanded pins — a sheet can't grow into a height nobody
+    /// recomputed. `.large` is offered alongside so an accessibility text size still reaches
+    /// everything even when these estimates run short.
+    private var sheetHeight: CGFloat {
+        var height: CGFloat = 392 // name, address, port, MAC + the action row
+        guard !profiles.profiles.isEmpty else { return height }
+        height += 104 // the Profile picker + the "Pinned cards" row
+        if pinsExpanded {
+            height += CGFloat(profiles.profiles.count) * 44 + 60 // a toggle each + the caption
+        }
+        return height
+    }
+    #endif
+
     /// The per-host profile rows: which profile this host uses by default, and which extra ones
     /// get their own card in the grid. Absent when no profiles exist — a user who has never made
     /// one sees exactly today's sheet, which is the "zero profiles = zero new clutter" rule.
@@ -186,7 +209,7 @@ struct AddHostSheet: View {
                     Text("Default settings (profile deleted)").tag(profileID)
                 }
             }
-            DisclosureGroup("Pinned cards") {
+            DisclosureGroup("Pinned cards", isExpanded: $pinsExpanded) {
                 ForEach(profiles.profiles) { profile in
                     Toggle(profile.name, isOn: Binding(
                         get: { pinnedIDs.contains(profile.id) },