Tab Bar Load Animation

Nucleic-Session: EEC60FAE-8368-49CA-9202-7026C12E7F8C
Co-authored-by: Nucleic <[email protected]>

NucleicRemote/NucleicRemote/Views/AdaptiveRootView.swift

@@ -74,10 +74,13 @@ struct CompactRootView: View {
     }
 }
 
-/// Our own bottom tab bar for the compact shell — a plain `.bar`-material strip of five items,
-/// standing in for the system tab bar so `CompactRootView` can animate its visibility itself
-/// (see that view for why). The material bleeds into the home-indicator area; the items stay in
-/// the safe region. The Sessions item carries the "needs you" badge the system tab item used to.
+/// Our own bottom tab bar for the compact shell — a floating Liquid Glass capsule of five items,
+/// standing in for the system tab bar so `CompactRootView` can animate its visibility itself (see
+/// that view for why) while keeping the iOS 26 floating-glass look. Real `glassEffect` on iOS 26;
+/// an ultra-thin material capsule with a hairline edge + soft shadow on earlier systems, matching
+/// the app's `glassSurface`/`glassCircle`. It floats inset from the edges, above the home
+/// indicator — it does not bleed to the screen edge. The Sessions item carries the "needs you"
+/// badge the system tab item used to.
 struct NucleicTabBar: View {
     @Binding var selection: Int
     /// Sessions blocking on a human — the red badge on the Sessions item (was the tab item badge).
@@ -98,15 +101,13 @@ struct NucleicTabBar: View {
                 itemButton(item)
             }
         }
-        .padding(.top, 8)
-        .padding(.bottom, 2)
-        // A hairline top separator, like the system bar's edge over scrolling content.
-        .overlay(alignment: .top) {
-            Rectangle().fill(Color.primary.opacity(0.10)).frame(height: 0.5)
-        }
-        // `.bar` is the material the system uses for tab/tool bars; bleed it into the bottom
-        // unsafe area so it reaches the screen edge under the home indicator.
-        .background(.bar, ignoresSafeAreaEdges: .bottom)
+        .padding(.horizontal, 6)
+        .padding(.vertical, 8)
+        .glassBar()
+        // Float the capsule inset from the edges and just above the home indicator, rather than
+        // filling the bottom edge like the old opaque bar.
+        .padding(.horizontal, 16)
+        .padding(.bottom, 4)
     }
 
     private func itemButton(_ item: Item) -> some View {
@@ -116,8 +117,8 @@ struct NucleicTabBar: View {
         } label: {
             VStack(spacing: 3) {
                 Image(systemName: item.icon)
-                    .font(.system(size: 22, weight: selected ? .semibold : .regular))
-                    .frame(height: 26)
+                    .font(.system(size: 21, weight: selected ? .semibold : .regular))
+                    .frame(height: 24)
                     .overlay(alignment: .topTrailing) {
                         if item.index == 1, needsYou > 0 {
                             Text(needsYou > 99 ? "99+" : "\(needsYou)")
@@ -133,6 +134,14 @@ struct NucleicTabBar: View {
             }
             .foregroundStyle(selected ? Palette.accent : Color.secondary)
             .frame(maxWidth: .infinity)
+            .padding(.vertical, 4)
+            // The selected item rides a soft accent-tinted capsule, echoing the system floating
+            // bar's highlighted tab.
+            .background {
+                if selected {
+                    Capsule().fill(Palette.accent.opacity(0.15))
+                }
+            }
             .contentShape(Rectangle())
         }
         .buttonStyle(.plain)
@@ -141,6 +150,22 @@ struct NucleicTabBar: View {
     }
 }
 
+private extension View {
+    /// The floating tab bar's Liquid Glass capsule backing — the capsule twin of `glassSurface`.
+    /// Real `glassEffect` on iOS 26; an ultra-thin material capsule with a hairline edge and soft
+    /// shadow on earlier systems so it still lifts off the content.
+    @ViewBuilder
+    func glassBar() -> some View {
+        if #available(iOS 26.0, *) {
+            glassEffect(.regular, in: .capsule)
+        } else {
+            background(.ultraThinMaterial, in: Capsule())
+                .overlay(Capsule().strokeBorder(Color.primary.opacity(0.08), lineWidth: 1))
+                .shadow(color: .black.opacity(0.18), radius: 10, y: 3)
+        }
+    }
+}
+
 // MARK: - Regular (iPad sidebar + detail)
 
 /// What the sidebar can select. Mirrors the Mac sidebar: a few global destinations plus the