## Changes
**Batch download**
- Add multi-select mode to the create-video results feed (webapp +
desktop) with a "Select" toggle in the topbar, checkboxes on completed
items, and a floating download bar
- Webapp: "Download" bundles selected videos into a single .zip
client-side (new jszip dependency, concurrent fetches, progress and
partial-failure toasts)
- Desktop: "Download" prompts for a folder and saves each selected video
as its own file via native Tauri save, with progress toasts
- Library: add a Download (zip) button to the existing bulk selection
bar
- Shared `ui-generation-list` lib gains a selection store, select
toggle, action bar, and optional selection props on the grid/list views
(existing hosts unaffected)
**Credits refresh on failed generations**
- Webapp: dispatch a credits refresh when the task queue or generation
feed observes a newly failed job (immediately and again after 2.5s so
server-side refunds settle)
- Desktop: also refresh credits when the 5s task poll discovers a
failure that the push event missed, and listen for `credits-change` in
the TopBar
**UI fixes**
- Selection download bar always sits above the promptbox regardless of
its size
- Mobile Generate/History header no longer overlaps the gallery toggles
(flex layout instead of absolute positioning)
- Reference deck top-aligns in the expanded prompt box instead of
centering
- "Play videos with sound" setting now defaults to on
BFlat
