* Shift+click on editor button now opens multi-directory selection dialog
* Multiple directories enable bulk mode with volume number assignment
* Uses Qt's built-in dialog with multi-selection enabled for native look and feel
* Define bulkVolumeCheck QCheckBox in MetaEditor.ui instead of creating it programmatically in KCC_gui.py
* Update tab order to include bulkVolumeCheck after volumeLine
* Add checkbox next to Volume field for enabling bulk volume editing (only in bulk mode)
* Support single number (5), range (1-10), or comma list (1, 3, 5) input formats
* Sort files alphabetically before volume assignment
* Validate that volume count matches file count
* Add rich HTML tooltip explaining the feature
* Enable multi-file selection in Metadata Editor using getOpenFileNames()
* Disable Volume, Number, and Title fields in bulk mode
* Pre-fill Series and author fields from first selected file in bulk mode
* Show status "Editing Y files" in bulk mode
* Add progress display during bulk save ("Processing X/Y: filename")
* Disable buttons during processing
* Skip read-only CBR files with error collection
* Show error summary dialog if any files fail to save
* Keep single file metadata editing the same
jaroslawjanas