Fix: Always use gistId from URL for sharing, prevent duplicate gist creation

[zimiovid]

Problem:
Currently, when opening a diagram via a share link (?shareId=...), the gistId is not always set correctly in the app state. As a result, when the user tries to share again, a new gist is created instead of updating the existing one. This leads to unnecessary gist duplication and breaks the expected collaborative workflow.

Solution:

• On Workspace mount, always set gistId from the shareId URL parameter if present.
• Ensure that all share/patch operations use this gistId.
• Now, if a user opens a diagram via a share link, further sharing will update the same gist, not create a new one.

Code changes:

• In Workspace.jsx, add a useEffect to set gistId from the URL on mount:

  useEffect(() => {
    const params = new URLSearchParams(window.location.search);
    const shareId = params.get("shareId");
    if (shareId) {
      setGistId(shareId);
    }
  }, []);

• In Share.jsx, use the current gistId for patching, and only create a new gist if gistId is empty:

  if (!gistId || gistId === "") {
    const id = await create(diagramToString());
    setGistId(id);
  } else {
    await patch(gistId, diagramToString());
  }

Result:

• Sharing a diagram after opening it via a share link will now update the existing gist, not create a new one.
• This makes sharing and collaboration more predictable and reliable.

[vercel]

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[1ilit]

Hey! Thanks for the pr!

Let's add

setGistId(shareId)

in loadFromGist() for now

[vercel]

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