Per-pin selection. Entered by single-clicking a pin (its name, stub, or tag);
the clicked pin becomes the standing target for edits. While selected, only
that pin shows its tag-visibility overlay (eye / “+”), its stub and tag
render brighter, and the block’s other pins are dimmed — so it stands out the
way a selected route does. The per-pin edits hand off to focused tools that
each return here when done, so the pin stays selected: