feat(dashboard): render the butterfly banner with a transparency mask

The dashboard banner showed the butterfly PNG without its transparency, because the image descriptor was built before the mask props were set. I moved the banner setup (dashboard-startup-banner, dashboard-banner-logo-title) ahead of dashboard-setup-startup-hook and added dashboard-image-extra-props with :mask heuristic, so the mask is in place when the startup hook builds the buffer. If a *dashboard* buffer already exists I refresh it, so the change shows without a restart.

I also re-encoded the PNG smaller and kept the previous encoding as M-x_butterfly.png.bak.

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