Save bar with sticky positioning, a determinate progress bar while
uploading chunks, plural save CTA, and a destructive discard link.
Replaces broken ICU plural in bulk_save_cta with two-key approach
(bulk_save_cta_one / bulk_save_cta) since Paraglide 2.5 does not support
ICU plural syntax.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
