Replaces the drawn shield-and-envelope stand-in with the real mark from
stalw.art (/favicon.svg), in their #DB2D54.
Padded from the source's 159.95x139.07 to a square 159.95 viewBox with
the art vertically centred, matching every other catalogue icon — all of
which are square, so a non-square box would letterbox in the app tiles.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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