Cache TOTP discovery and report progress (#74)

crates/storage/src/mutation.rs

@@ -612,14 +612,6 @@ impl<'a> TreeMutator<'a> {
                 path: repository.git_directory().to_owned(),
             });
         }
-        if let Some(path) = snapshot
-            .collisions()
-            .find(|path| path.starts_with(root.as_path()))
-        {
-            return Err(MutationError::SourceTypeCollision {
-                path: (*path).clone(),
-            });
-        }
         Ok(())
     }
 
@@ -760,7 +752,6 @@ pub enum MutationError {
     SameObject,
     DestinationInsideSource,
     DestinationDirectoryMissing { directory: DirectoryPath },
-    SourceTypeCollision { path: std::path::PathBuf },
     DestinationTypeCollision { path: std::path::PathBuf },
     UnsafePolicyOverwrite { directory: DirectoryPath },
     UnsupportedAuxiliary { path: std::path::PathBuf },
@@ -788,11 +779,6 @@ impl fmt::Display for MutationError {
                 formatter,
                 "trailing-slash destination directory does not exist: {directory}"
             ),
-            Self::SourceTypeCollision { path } => write!(
-                formatter,
-                "source subtree contains an entry/directory collision: {}",
-                path.display()
-            ),
             Self::DestinationTypeCollision { path } => write!(
                 formatter,
                 "directory destination collides with password entry: {}",