v0.3.4

Creative Studio canvas polish

• Creation cards show open / use-as-reference / delete on desktop hover (always visible on touch devices).
• Removed the media-type corner badge for a cleaner gallery.
• Deleting a creation opens an in-app confirmation modal with thumbnail and title, instead of the browser native confirm dialog.
• Soft-delete in production; mock mode removes items locally after confirm, with loading protection against double submit.
• Delete-related copy is localized for English, Simplified Chinese, Traditional Chinese, Japanese, and Korean.