fix: upload failure, share dialog, shared view styling, dark mode fixes

- Fix 'folder_id is required' upload error by adding create_home_folder
  through the full hexagonal architecture (trait, service, repository, auth)
- Fix double upload issue with _isUploading concurrency guard
- Fix Share context menu doing nothing (ID collision between sharedView
  and main share dialog resolved with sv- prefix)
- Fix Compartidos tab duplicate headers and broken layout
- Add missing .shared-dialog CSS with dark mode support
- Fix dark mode white backgrounds on empty-state, shared-filters,
  trash-actions, action-btn, and header
- Fix i18n key mismatches in sharedView
- Bump version to 0.4.1

Closes #120

src/common/stubs.rs

@@ -322,6 +322,14 @@ impl FolderRepository for StubFolderStoragePort {
     async fn delete_folder_permanently(&self, _folder_id: &str) -> Result<(), DomainError> {
         Ok(())
     }
+
+    async fn create_home_folder(
+        &self,
+        _user_id: &str,
+        _name: String,
+    ) -> Result<Folder, DomainError> {
+        Ok(Folder::default())
+    }
 }
 
 // ---------------------------------------------------------------------------
@@ -414,6 +422,10 @@ impl FolderUseCase for StubFolderUseCase {
     async fn delete_folder(&self, _id: &str, _caller_id: &str) -> Result<(), DomainError> {
         Ok(())
     }
+
+    async fn create_home_folder(&self, _user_id: &str, _name: String) -> Result<FolderDto, DomainError> {
+        Ok(FolderDto::default())
+    }
 }
 
 // ---------------------------------------------------------------------------