Updated logo, carried to every derived icon

New ultimo-logo and signet SVGs, re-rendered into the PWA icons (any and
maskable), apple-touch icon, favicon, the public and calendar-plugin
signet copies, the BIMI Tiny-PS logo and the system-email logo PNG, each
at its previous size, placement and background.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

frontend/public/bimi/ultimo-logo.svg

@@ -1,7 +1,7 @@
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 <title>Ultimo Email</title>
 <desc>Ultimo Email logo, for BIMI (SVG Tiny Portable/Secure)</desc>
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