- MainLogo.vue: new 'receipt + check' mark + InvoiceShelf wordmark lockup
(monochrome, inherits the existing light/dark colour props — works in the
header, auth, installation, sidebar, loader, and customer portal).
- Favicons + PWA icons regenerated from the new mark (16/32/180/192/512/150 +
favicon.ico); safari-pinned-tab.svg redrawn to the new mark; mask-icon colour
#5851d8 -> #4a3dff.
- New brand SVG assets (logo-mark + variants + lockup) added under static/img;
logo-gray.png (public-invoice footer) regenerated as the mono mark.