Split button: «IDE-Link kopieren ▾» in front, «In IDE öffnen» in the menu - #20

Swaps the two actions of the P17 split button, as decided: copying the link is the learners' hand-in, so it is the visible action.

• Main button: «IDE-Link kopieren» (en: "Copy IDE link"). It copies the link and shows «Link kopiert ✓», or, without a clipboard, the link in a field, focused and selected. New tooltip: «Kopiert einen Link zu einer Kopie dieses Codes in der IDE, z. B. für die Abgabe.» (en: "Copies a link to a copy of this code in the IDE, e.g. to hand it in.")
• ▾ menu: «In IDE öffnen» opens the same link in a new tab, keeping its tooltip «Öffnet eine Kopie in der IDE – Änderungen dort wirken nicht hierher zurück.»
• Both still act directly in the tap's handler (writeText, window.open), as iPad Safari requires. The classes are unchanged (glp-button--ide, glp-button--ide-menu), and so is features=ide.
• README: the button row and the paragraph for course authors.

Tested in the hosted LiaScript player (this macro served locally):

• The main button shows «IDE-Link kopieren» with the new tooltip. A click shows «Link kopiert ✓», and the copied link, opened in a fresh browser profile at https://glpython-edu.github.io/, runs and prints Quadrat: 49.
• ▾ → «In IDE öffnen» (with its tooltip) opens a new tab at https://glpython-edu.github.io/.
• With a clipboard that refuses, the field is shown, focused and fully selected.

node scripts/check-macro.mjs passes.

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