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https://github.com/nadermx/backgroundremover/releases/tag/v0.4.4 Add flask and pillow-heif to match upstream requirements.txt so pythonRuntimeDepsCheckHook succeeds (nixpkgs-update 2026-06-28 failure). Signed-off-by: lucasew <lucas59356@gmail.com> Assisted-by: Grok Build / Grok 4.3 (xAI)