Release Keyboard Release

Nucleic-Session: FD190A87-E8F7-4C72-A15E-E35B88EF5921

NucleicRemote/NucleicRemote/Views/Theme.swift

@@ -103,6 +103,26 @@ extension Risk {
     }
 }
 
+/// Adds a "Done" button to the keyboard's accessory toolbar so any focused composer can always
+/// dismiss the keyboard. The multiline composers (`axis: .vertical`) turn Return into a newline,
+/// so without this there's no way to release the keyboard once it opens. The modifier carries its
+/// own `@FocusState` and binds it to the field, keeping callers to a single `.keyboardDismissable()`.
+struct KeyboardDismissable: ViewModifier {
+    @FocusState private var focused: Bool
+    func body(content: Content) -> some View {
+        content
+            .focused($focused)
+            .toolbar {
+                ToolbarItemGroup(placement: .keyboard) {
+                    Spacer()
+                    Button { focused = false } label: {
+                        Label("Done", systemImage: "keyboard.chevron.compact.down")
+                    }
+                }
+            }
+    }
+}
+
 /// A lifted card surface with a hairline border — the mobile echo of `AppTheme.surface`.
 struct CardBackground: ViewModifier {
     var padding: CGFloat = 14