fix: gate WhatsApp helpers used only by the Web adapter

src/providers/whatsapp_shared/error.rs

@@ -11,6 +11,10 @@ pub(crate) enum WaFailure {
     /// Refused before any provider call: bad scope, missing port, invalid input.
     Rejected(String),
     /// The input cannot be represented by this provider's address format.
+    ///
+    /// Only the Web adapter builds this class; the Cloud API adapter just
+    /// handles it.
+    #[cfg_attr(not(any(test, feature = "whatsapp-web")), allow(dead_code))]
     BadFormat(String),
     /// The adapter or protocol cannot carry this content or operation.
     Unsupported(String),
@@ -35,6 +39,7 @@ impl WaFailure {
         Self::Rejected(message.into())
     }
 
+    #[cfg(any(test, feature = "whatsapp-web"))]
     pub(crate) fn bad_format(message: impl Into<String>) -> Self {
         Self::BadFormat(message.into())
     }

src/providers/whatsapp_shared/window.rs

@@ -76,8 +76,10 @@ impl BoundedMap {
 /// aborted. A listener that parks keeps its inbound sender in such a slot; if
 /// the slot outlived the listener the module's inbound forwarder would never
 /// see its channel close and provider shutdown would wait forever.
+#[cfg(any(test, feature = "whatsapp-web"))]
 pub(crate) struct ClearOnDrop<'a, T>(pub(crate) &'a parking_lot::Mutex<Option<T>>);
 
+#[cfg(any(test, feature = "whatsapp-web"))]
 impl<T> Drop for ClearOnDrop<'_, T> {
     fn drop(&mut self) {
         *self.0.lock() = None;