fix(#105): ensure folders are nested inside user home folder

Root cause: when window.app.currentPath was empty/falsy (due to timing,
page state reset, or initialization), the frontend sent parent_id: null.
The backend then created folders at the storage root instead of inside
the user's home folder.

Backend fix (folder_handler.rs):
- Added AuthUser extractor to create_folder handler
- When parent_id is None, auto-resolves the user's home folder
  ('My Folder - {username}') as the parent folder
- Folders are now always created inside the user's directory tree

Frontend fix (fileOperations.js):
- Changed parent_id fallback from null to window.app.userHomeFolderId
- Prevents sending null parent_id even if currentPath is reset

Search in subfolders: no fix needed — search_recursive() already
traverses the filesystem correctly; it was only failing because folders
were physically flat instead of nested.

Bumps service worker cache to v12.

src/interfaces/api/handlers/folder_handler.rs

@@ -1,19 +1,19 @@
-use axum::{
-    Json,
-    extract::{Path, Query, State},
-    http::{HeaderName, HeaderValue, Response, StatusCode, header},
-    response::IntoResponse,
-};
-use std::collections::HashMap;
 use std::sync::Arc;
+use std::collections::HashMap;
+use axum::{
+    extract::{Path, State, Query},
+    http::{StatusCode, header, HeaderName, HeaderValue, Response},
+    response::IntoResponse,
+    Json,
+};
 
-use crate::application::dtos::folder_dto::{CreateFolderDto, MoveFolderDto, RenameFolderDto};
-use crate::application::dtos::pagination::PaginationRequestDto;
-use crate::application::ports::inbound::FolderUseCase;
 use crate::application::services::folder_service::FolderService;
-use crate::common::di::AppState as GlobalAppState;
+use crate::application::dtos::folder_dto::{CreateFolderDto, RenameFolderDto, MoveFolderDto};
+use crate::application::dtos::pagination::PaginationRequestDto;
 use crate::common::errors::ErrorKind;
-use crate::interfaces::middleware::auth::{AuthUser, OptionalAuthUser};
+use crate::application::ports::inbound::FolderUseCase;
+use crate::common::di::AppState as GlobalAppState;
+use crate::interfaces::middleware::auth::{OptionalAuthUser, AuthUser};
 
 type AppState = Arc<FolderService>;
 
@@ -22,10 +22,44 @@ pub struct FolderHandler;
 
 impl FolderHandler {
     /// Creates a new folder
+    /// When parent_id is not provided, the folder is created inside the
+    /// authenticated user's home folder ("My Folder - {username}") rather
+    /// than at the storage root.  This prevents user-created directories
+    /// from being placed flat in ./storage/.
     pub async fn create_folder(
         State(service): State<AppState>,
-        Json(dto): Json<CreateFolderDto>,
+        auth_user: AuthUser,
+        Json(mut dto): Json<CreateFolderDto>,
     ) -> impl IntoResponse {
+        // If no parent_id was supplied, resolve the user's home folder as
+        // the default parent so the new folder is nested correctly.
+        if dto.parent_id.is_none() {
+            let home_folder_name = format!("My Folder - {}", auth_user.username);
+            tracing::info!(
+                "create_folder: parent_id is None for user '{}', looking up home folder '{}'",
+                auth_user.username, home_folder_name
+            );
+            match service.list_folders(None).await {
+                Ok(folders) => {
+                    if let Some(home) = folders.iter().find(|f| f.name == home_folder_name) {
+                        tracing::info!(
+                            "create_folder: resolved home folder ID '{}' for user '{}'",
+                            home.id, auth_user.username
+                        );
+                        dto.parent_id = Some(home.id.clone());
+                    } else {
+                        tracing::warn!(
+                            "create_folder: home folder '{}' not found, folder will be created at root",
+                            home_folder_name
+                        );
+                    }
+                }
+                Err(e) => {
+                    tracing::error!("create_folder: failed to list folders for home resolution: {}", e);
+                }
+            }
+        }
+
         match service.create_folder(dto).await {
             Ok(folder) => (StatusCode::CREATED, Json(folder)).into_response(),
             Err(err) => {
@@ -111,20 +145,18 @@ impl FolderHandler {
         parent_id: Option<&str>,
     ) -> axum::response::Response {
         match service.list_folders(parent_id).await {
-            Ok(folders) => (StatusCode::OK, Json(folders)).into_response(),
+            Ok(folders) => {
+                (StatusCode::OK, Json(folders)).into_response()
+            },
             Err(err) => {
                 let status = match err.kind {
                     ErrorKind::NotFound => StatusCode::NOT_FOUND,
                     _ => StatusCode::INTERNAL_SERVER_ERROR,
                 };
                 
-                (
+                (status, Json(serde_json::json!({
-                    status,
-                    Json(serde_json::json!({
                     "error": err.to_string()
-                    })),
+                }))).into_response()
-                )
-                    .into_response()
             }
         }
     }
@@ -140,9 +172,7 @@ impl FolderHandler {
             Ok(folders) => {
                 // Only filter at root level (parent_id == None)
                 let filtered = if parent_id.is_none() {
-                    folders
+                    folders.into_iter().filter(|f| {
-                        .into_iter()
-                        .filter(|f| {
                         // Skip hidden/system folders
                         if f.name.starts_with('.') {
                             return false;
@@ -153,25 +183,20 @@ impl FolderHandler {
                         }
                         // Non-home folders are visible to everyone
                         true
-                        })
+                    }).collect()
-                        .collect()
                 } else {
                     folders
                 };
                 (StatusCode::OK, Json(filtered)).into_response()
-            }
+            },
             Err(err) => {
                 let status = match err.kind {
                     ErrorKind::NotFound => StatusCode::NOT_FOUND,
                     _ => StatusCode::INTERNAL_SERVER_ERROR,
                 };
-                (
+                (status, Json(serde_json::json!({
-                    status,
-                    Json(serde_json::json!({
                     "error": err.to_string()
-                    })),
+                }))).into_response()
-                )
-                    .into_response()
             }
         }
     }
@@ -183,7 +208,9 @@ impl FolderHandler {
         parent_id: Option<&str>,
     ) -> axum::response::Response {
         match service.list_folders_paginated(parent_id, &pagination).await {
-            Ok(paginated_result) => (StatusCode::OK, Json(paginated_result)).into_response(),
+            Ok(paginated_result) => {
+                (StatusCode::OK, Json(paginated_result)).into_response()
+            },
             Err(err) => {
                 let status = match err.kind {
                     ErrorKind::NotFound => StatusCode::NOT_FOUND,
@@ -191,13 +218,9 @@ impl FolderHandler {
                 };
                 
                 // Return a JSON error response
-                (
+                (status, Json(serde_json::json!({
-                    status,
-                    Json(serde_json::json!({
                     "error": err.to_string()
-                    })),
+                }))).into_response()
-                )
-                    .into_response()
             }
         }
     }
@@ -218,13 +241,9 @@ impl FolderHandler {
                 };
                 
                 // Return a proper JSON error response
-                (
+                (status, Json(serde_json::json!({
-                    status,
-                    Json(serde_json::json!({
                     "error": err.to_string()
-                    })),
+                }))).into_response()
-                )
-                    .into_response()
             }
         }
     }
@@ -274,10 +293,7 @@ impl FolderHandler {
         OptionalAuthUser(auth_user): OptionalAuthUser,
         Path(id): Path<String>,
     ) -> impl IntoResponse {
-        let user_id = auth_user
+        let user_id = auth_user.as_ref().map(|u| u.id.as_str()).unwrap_or("anonymous");
-            .as_ref()
-            .map(|u| u.id.as_str())
-            .unwrap_or("anonymous");
         // Check if trash service is available
         if let Some(trash_service) = &state.trash_service {
             tracing::info!("Moving folder to trash: {}", id);
@@ -287,12 +303,9 @@ impl FolderHandler {
                 Ok(_) => {
                     tracing::info!("Folder successfully moved to trash: {}", id);
                     return StatusCode::NO_CONTENT.into_response();
-                }
+                },
                 Err(err) => {
-                    tracing::warn!(
+                    tracing::warn!("Could not move folder to trash, falling back to permanent delete: {}", err);
-                        "Could not move folder to trash, falling back to permanent delete: {}",
-                        err
-                    );
                     // Fall through to regular delete if trash fails
                 }
             }
@@ -304,7 +317,7 @@ impl FolderHandler {
             Ok(_) => {
                 tracing::info!("Folder permanently deleted: {}", id);
                 StatusCode::NO_CONTENT.into_response()
-            }
+            },
             Err(err) => {
                 tracing::error!("Error deleting folder: {}", err);
                 
@@ -313,13 +326,9 @@ impl FolderHandler {
                     _ => StatusCode::INTERNAL_SERVER_ERROR,
                 };
                 
-                (
+                (status, Json(serde_json::json!({
-                    status,
-                    Json(serde_json::json!({
                     "error": format!("Error deleting folder: {}", err)
-                    })),
+                }))).into_response()
-                )
-                    .into_response()
             }
         }
     }
@@ -345,10 +354,7 @@ impl FolderHandler {
                 // Create the ZIP file
                 match zip_service.create_folder_zip(&id, &folder.name).await {
                     Ok(zip_data) => {
-                        tracing::info!(
+                        tracing::info!("ZIP file created successfully, size: {} bytes", zip_data.len());
-                            "ZIP file created successfully, size: {} bytes",
-                            zip_data.len()
-                        );
                         
                         // Setup headers for download
                         let filename = format!("{}.zip", folder.name);
@@ -356,16 +362,9 @@ impl FolderHandler {
                         
                         // Build response with the ZIP data
                         let mut headers = HashMap::new();
-                        headers.insert(
+                        headers.insert(header::CONTENT_TYPE.to_string(), "application/zip".to_string());
-                            header::CONTENT_TYPE.to_string(),
+                        headers.insert(header::CONTENT_DISPOSITION.to_string(), content_disposition);
-                            "application/zip".to_string(),
+                        headers.insert(header::CONTENT_LENGTH.to_string(), zip_data.len().to_string());
-                        );
-                        headers
-                            .insert(header::CONTENT_DISPOSITION.to_string(), content_disposition);
-                        headers.insert(
-                            header::CONTENT_LENGTH.to_string(),
-                            zip_data.len().to_string(),
-                        );
                         
                         // Build the response
                         let mut response = Response::builder()
@@ -377,24 +376,20 @@ impl FolderHandler {
                         for (name, value) in headers {
                             response.headers_mut().insert(
                                 HeaderName::from_bytes(name.as_bytes()).unwrap(),
-                                HeaderValue::from_str(&value).unwrap(),
+                                HeaderValue::from_str(&value).unwrap()
                             );
                         }
                         
                         response
-                    }
+                    },
                     Err(err) => {
                         tracing::error!("Error creating ZIP file: {}", err);
-                        (
+                        (StatusCode::INTERNAL_SERVER_ERROR, Json(serde_json::json!({
-                            StatusCode::INTERNAL_SERVER_ERROR,
-                            Json(serde_json::json!({
                             "error": format!("Error creating ZIP file: {}", err)
-                            })),
+                        }))).into_response()
-                        )
-                            .into_response()
-                    }
                     }
                 }
+            },
             Err(err) => {
                 tracing::error!("Folder not found: {}", err);
                 let status = match err.kind {
@@ -402,13 +397,9 @@ impl FolderHandler {
                     _ => StatusCode::INTERNAL_SERVER_ERROR,
                 };
                 
-                (
+                (status, Json(serde_json::json!({
-                    status,
-                    Json(serde_json::json!({
                     "error": format!("Error finding folder: {}", err)
-                    })),
+                }))).into_response()
-                )
-                    .into_response()
             }
         }
     }

static/js/fileOperations.js

@@ -342,7 +342,7 @@ const fileOps = {
                 },
                 body: JSON.stringify({
                     name: name,
-                    parent_id: window.app.currentPath || null
+                    parent_id: window.app.currentPath || window.app.userHomeFolderId || null
                 })
             });
 

static/sw.js

@@ -1,5 +1,5 @@
 // OxiCloud Service Worker
-const CACHE_NAME = 'oxicloud-cache-v11';
+const CACHE_NAME = 'oxicloud-cache-v12';
 const ASSETS_TO_CACHE = [
   '/',
   '/index.html',