Fix recursive update when opening bridge image previews

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idk whats going on ngl codex wrote the patch
fixes crash when opening malformed image links
here's Sol's explanation

The crash is in EdenMod’s preview state handling—not image decoding, Java 26, or Polyfrost.

The crash report (https://mclo.gs/vfYTVws) shows:

IllegalStateException: Recursive update
ConcurrentHashMap.put(...)
ImagePreviewManager.downloadImage(ImagePreviewManager.java:252)
ConcurrentHashMap.computeIfAbsent(...)
ImagePreviewManager.renderPreview(ImagePreviewManager.java:151)

Cause:

1. src/tel/eden/mod/mixin/GuiGraphicsMixin.java:19 extracts everything after [EDEN_IMG] from the displayed hover text.
2. Another chat layer has appended \nOpens on click. to that text, so the extracted “URL” is malformed.
3. src/tel/eden/mod/chat/ImagePreviewManager.java:151 calls downloadImage() inside states.computeIfAbsent(...).
4. Validation rejects the malformed URL, even though its actual host is trusted.
5. src/tel/eden/mod/chat/ImagePreviewManager.java:252 calls states.put() for the same key while computeIfAbsent() is still computing it.
   ConcurrentHashMap detects this recursive mutation and throws on the render thread.

Recommended fix:

• Obtain the canonical URL from style.getClickEvent() when it is a ClickEvent.OpenUrl, using openUrl.uri().toString(). The formatter already
  stores the original URI there in src/tel/eden/mod/chat/DiscordChatFormatter.java:275. Don’t parse the user-visible hover text as the URL.

• Replace the side-effecting computeIfAbsent with putIfAbsent, then start the download only if this call inserted DOWNLOADING.

• If the recovered URL still fails validation, leave the ordinary tooltip/link behavior intact instead of cancelling it.

Core state change:

PreviewState state = states.get(url);
if (state == null) {
PreviewState initial =
isPreviewable(url) ? PreviewState.DOWNLOADING : PreviewState.ERROR;
PreviewState previous = states.putIfAbsent(url, initial);
state = previous != null ? previous : initial;

  if (previous == null && initial == PreviewState.DOWNLOADING) {
      downloadImage(url);
      state = states.get(url);
  }

}

This fixes both layers: Discord previews continue working despite tooltip augmentation, and malformed or untrusted URLs can never crash through a
recursive map update. No repository files were changed; this was diagnosis and a proposed patch. Analysis completed in about 2 minutes 20
seconds.

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@imol-ai @SirKaiMartin

[SirKaiMartin]

changes and explanation looks good