V1: Add owner-scoped folder pagination (list_folders_by_owner_paginated)
- New method in FolderRepository trait, PG implementation, service & handler
- Prevents IDOR by filtering folder listings to authenticated user
V2: Enforce ownership checks on folder mutations
- rename_folder, move_folder, delete_folder now require caller_id
- Service verifies folder.owner_id == caller_id (returns 404 on mismatch)
- Propagated to folder_handler, batch_handler, batch_operations, webdav_handler
- delete_folder_with_trash upgraded from OptionalAuthUser to AuthUser
- download_folder_zip now checks ownership before streaming
V3: Fix XSS in frontend via DOM APIs
- sharedView.js: innerHTML → createElement + textContent
- contextMenus.js: innerHTML → DOM construction for share dialog
Cleanup: removed unused OptionalAuthUser import, updated all stubs/mocks
- Add checkboxes to list view items (grid view already had them)
- Add 'select all' checkbox in list view header
- Add batch action bar with Delete, Move, and Download buttons
- Batch delete: moves all selected items to trash in one operation
- Batch move: reuses existing move dialog in batch mode
- Batch download: downloads each selected item
- Keyboard shortcuts: Ctrl+A (select all), Escape (deselect), Delete key
- Shift+click for range selection in both grid and list views
- Selection state synced between grid and list views
- New multiSelect.js module manages selection state and batch operations