Implement Rust-owned adaptive Android password navigation (#96)

crates/storage/src/mobile_authentication.rs

@@ -737,6 +737,50 @@ impl MobileAuthentication {
             .map_err(MobileAuthenticationError::authentication)
     }
 
+    /// Open only the entry selected from a still-current navigation page.
+    pub fn navigation_entry(
+        &self,
+        directory: &str,
+        row_id: &str,
+        revision: &str,
+        passphrase: Option<SecretBytes>,
+        unix_seconds: u64,
+    ) -> Result<MobileEntryPresentation, MobileAuthenticationError> {
+        let validate = || {
+            let page = crate::mobile_passwords::navigation::navigate_repository(
+                &self.repository,
+                directory,
+                Some(row_id),
+                Some(revision),
+                false,
+            )
+            .map_err(|_| {
+                entry_detail(
+                    "Selection Is Unavailable",
+                    "Refresh the folder and select the entry again.",
+                )
+            })?;
+            page.selected
+                .filter(|row| {
+                    row.row.kind() == crate::mobile_passwords::MobilePasswordRowKind::Entry
+                })
+                .ok_or_else(|| {
+                    entry_detail(
+                        "Selection Changed",
+                        "Refresh the folder and select the entry again.",
+                    )
+                })
+        };
+        let selected = validate()?;
+        self.unlock_entry(selected.row.path(), passphrase)?;
+        let presentation = self.entry_page(selected.row.path(), unix_seconds)?;
+        if let Err(error) = validate() {
+            self.manual_lock()?;
+            return Err(error);
+        }
+        Ok(presentation)
+    }
+
     pub fn entry_page(
         &self,
         path: &str,