Modern blur for panorama / dark overlay

[muzikbike]

Since 24w09a, the panorama persists when in the options menu and when managing worlds, with a dark graphic overlaid and a blur shader applied.

In 24w09a and 24w10a, a box blur effect was used:

From 24w11a onwards, a linear blur is used instead:

The graphic overlaid on the panorama is as follows:

I'm not sure if implementing these would be out of scope for the panorama viewer but it'd help bring it closer to parity with what can be seen in the actual game.