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This looks neat, but without a way to inject into the steam client (or gog client) on the desktop it seems like you're hitting a particularly small audience. Most people aren't using a browser to access these services.
Making this into a decky add-on (there are already addons that add a banner to store pages based on similar info) would be an awesome next step that would help increase visibility for this kind of thing.
I for one can't browse the steam store without the steamdb plugin anymore, since it shows not only the current sale price, but the price history.
This will pair nicely with that.