Will Miao 93ad81ed87 fix(ui): replace full-page loading overlay with grid-scoped loader to eliminate flicker ...

- Add .grid-loading-overlay CSS: position:absolute inside card grid,
  semi-transparent dark background, z-index 100, pointer-events:none
- Add showGridLoading() / hideGridLoading() to VirtualScroller:
  creates/removes the scoped overlay inside the card grid only
- Modify loadMoreWithVirtualScroll(): replace full-page
  state.loadingManager overlay with grid-scoped loading, defer
  hide via requestAnimationFrame to eliminate blank-frame gap
- Clean up gridLoadingOverlay in dispose() to prevent DOM leak

2026-06-24 21:11:13 +08:00

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