The Aegis card carried a 🛡 emoji as its glyph, which is generic and
picks up whatever shield the reader's font renders — often colourful
and unrelated to the wallet's identity. Swapped it for Aegis's real
brand mark (hexagonal shield outline + target reticle, acid green),
inlined from bundled-addons/aegis/addon.json where it's the source of
truth for the wallet's own icon everywhere in Theseus.
Also updated the sidebar's Aegis-wallet link to the same SVG so the
mobile/narrow icon rail shows the brand instead of the emoji.
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