IDE links in the compact form ?p= (raw deflate, base64url) - #34

P46: the embed's «IDE-Link kopieren» and «In IDE öffnen» write the IDE's compact share link. This needs glpython-edu.github.io#40, which reads it.

What changes

• The link: the same JSON payload as before, its UTF-8 bytes compressed with raw deflate (level 9) and written as base64url without = padding, in ?p= (#p= beyond 8,192 characters). It's the same format as the IDE's «Teilen» (#40 has the details and a test vector) and about 40 % shorter.
• fflate 0.8.3 is loaded from jsDelivr with an integrity hash, like lz-string: sha384-ETfVLWAUsU3zp3SpnQsPDbAyrF6jYv2w8aNYo6KtY2JuyxXhzYLOL7e0ATbLSIHP, identical to the npm package's file. It works synchronously, so the link is still built inside the tap (iPad: clipboard and new tab).
• Fallback: where fflate doesn't load (blocked, or a page with an AMD loader that takes the global), the macro writes the old ?project= with lz-string, which the IDE reads too. The button is enabled once fflate has loaded, or once it has failed and lz-string has loaded.
• Checked in the real player: fflate loads as a global there (no AMD define).

Checks

• check:ready has two new cases. The libraries are served from node_modules (fflate and lz-string as devDependencies, the same bytes as on jsDelivr, so the integrity hashes hold).
  • With fflate: «IDE-Link kopieren» copies https://glpython-edu.github.io/?p=… in base64url. Node's zlib reads it as the block's two files with mainFile.
  • Without fflate: the copied link is ?project=…, which lz-string reads.
• check-macro passes.
• check:player wasn't run, since this doesn't touch the ready path.

Going live

1. First glpython-edu.github.io#40 is merged and deployed. Otherwise a course's ?p= link would open an empty project in the old IDE.
2. Then this PR; merging reaches the macro on main.
3. Then a patch version bump per course, so the courses load the new macro.

Manual tests

Desktop (Chrome, Safari, Firefox), in a course after the bump:

1. «IDE-Link kopieren»: the copied link starts with https://glpython-edu.github.io/?p= and opens the block's files in the IDE.
2. ▾ «In IDE öffnen»: a new tab with the same project.
3. With jsDelivr blocked (DevTools → network request blocking for fflate): the link is ?project=… and opens too.

iPad (Safari, external keyboard):

1. «IDE-Link kopieren» copies right away, and the link opens in the IDE.
2. «In IDE öffnen» opens a new tab.
3. The button is reachable with Tab and works with Enter or Space.

Follow-ups (not done)

• One more request: the page loads fflate (about 33 KB, 12 KB gzipped) in addition to lz-string. lz-string could go once no fallback is wanted.

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