documentation

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+# Desktop clipboard uses the xdg-desktop-portal Clipboard API
+
+The desktop daemon reaches the clipboard through `xdg-desktop-portal` rather
+than native X11 calls. Wayland — the default session on modern Fedora/Ubuntu —
+exposes no direct clipboard access, so an X11-only daemon is broken for most
+Linux users. Consequence: on Wayland the daemon cannot passively poll; an active
+portal session started by a user gesture is required, so "enable clipboard
+sync" is an explicit action (trivial no-op grant on X11). Windows uses the
+Win32 clipboard API.