glpython's own logo: favicon, apple-touch-icon, the mark in the top bar - #44

P41: glpython gets its own logo, a balance bike that is also an expression tree (the saddle a node, the two lines to the wheels edges to two leaves), white on ink #1F3A5F.

What changes

• Favicon: public/favicon.svg is the logo's file, unchanged (a rounded ink square with the white mark). The <link rel="icon" type="image/svg+xml"> stays.
• iPad home screen: public/apple-touch-icon.png (180 × 180, full bleed; iOS rounds the corners), and <link rel="apple-touch-icon" href="/apple-touch-icon.png"> in index.html.
• Top bar: src/GlpythonMark.tsx draws the mark in currentColor, the same drawing as the favicon. It replaces lucide's «Sparkles» in .ide-brand-mark, on the existing ink square, aria-hidden as before. The word «glpython» stays the accessible name.
  • Size: 22 px instead of Sparkles' 16. The mark fills less of its 32-unit box than Sparkles does of its own, so at 16 px it looked smaller than before; at 22 it fills the square as Sparkles did.
• Removed: public/icons.svg, Vite's template sprite (social icons). Nothing referenced it.

Not changed

• Web app manifest: the IDE has none, and this doesn't add one. The apple-touch-icon is enough for «Zum Home-Bildschirm». A manifest would only matter for installing it as an app (Android, desktop Chrome).
• The embed doesn't use Sparkles as a logo. glpython-editor uses it only as the icon in the turtle graphics panel's heading, so nothing changes there.

Checks

• test:browser (26 checks), lint and the build pass.

• dist/ has favicon.svg and apple-touch-icon.png, and no longer icons.svg. The page links both icons.

• Screenshots:

  • the top bar on desktop and iPad portrait;
  • the brand at 16 and 22 px;
  • the favicon at 16 and 32 px on a light and a dark tab strip.

  These are a stand-in for the real tab, which a headless browser can't screenshot.

Going live

Merging deploys the IDE.

After that, each browser shows its own copy for a while:

• Favicon: browsers cache it hard, so the tab may keep the old one until a reload.
• Home screen: iPad Safari picks up the apple-touch-icon only for a new home-screen icon; an existing one keeps its old picture.

Manual tests

Desktop:

1. Chrome with a light and a dark browser theme: the tab shows the bike on ink (reload if it still shows the old icon).
2. Safari: the same in the tab and in the bookmarks.
3. The top bar: the bike centred and crisp in the ink square, where Sparkles was.

iPad (Safari):

1. Open https://glpython-edu.github.io/, then Share → «Zum Home-Bildschirm».
2. The preview and the home screen show the bike on ink with rounded corners, not a screenshot of the page.
3. Open the IDE from the home screen: it starts as usual.
4. The top bar in portrait: only the mark (the word goes at that width, as before), centred.

Follow-ups (not done)

• In a dark browser theme, the ink square of the favicon is close to the dark tab strip. The white mark stays clear, but a light ring around the square would make the icon itself stand out more. Your call, as it changes the logo.

🤖 Generated with Claude Code