A second launch hands its request to the open window and exits: over a
Unix socket in the user's runtime directory, or a named pipe on Windows
whose name carries a random key from the user's config directory, so
another account cannot take the name first. The open window comes forward,
and a share link given as the first such argument opens the Add form with
it filled in. Setup failures are logged and the app runs without the lock.
Headings are set in Inter SemiBold, everything else in Inter Regular, so a
title sets the same on every desktop. Media and navigation glyphs (⏭, 🔊, ⛶,
★) come from the Phosphor icon font instead of whichever fallback font had
them. The CJK fallback still loads on its own thread and now joins the
bundled fonts instead of replacing them. The window carries the app icon
on X11 and Windows.
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