Pending tiles now have a hover-revealed trash button that opens a confirm
modal noting the image will still appear in the library when complete.
Removing the entry from pendingGenerations is enough — the Tauri completion
bridge filters incoming events on membership, so the eventual result is
silently dropped from PageDraw.
The confirm modal auto-closes if the underlying generation resolves before
the user confirms, and clears its tracked target if dismissed externally.
Tanish Manku
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