fix(editor): allow external URL links in block content

[jwalkingjew]

Summary

• Reverts the specific portion of Feat: add link handling in text blocks #1355 that disallowed clickable external URLs in text-block content. External (http/https) links now render as real anchors that open in a new tab (target=\"_blank\" rel=\"noopener noreferrer\").
• Internal graph:// links keep their existing same-page in-app navigation (intercepted by the document-level click handler in editor.tsx).
• Affects both the client TipTap browse-mode renderer (Web2URLMark) and the server-rendered markdown path (renderMarkdownDocument / markdownToRenderedHtml) so SSR and CSR behave the same.

Edit-mode rendering is unchanged — markdown text editing UX from #1355 (mention/link insertion, hover tooltips, parsing) is preserved.

Test plan

• Unit: markdown-render and markdown-adapter render tests assert target=\"_blank\" on https anchors and absence on graph:// anchors
• Manual: external [example](https://example.com) in a text block is clickable in browse mode and opens in a new tab
• Manual: same content in edit mode still renders the markdown source string with the existing edit-mode styling
• Manual: graph:// link still navigates in-app, same tab
• Manual: SSR — first paint of an entity page with an external link produces an anchor with target=\"_blank\"

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Project	Deployment	Actions	Updated (UTC)
geogenesis	Ready	Preview	May 4, 2026 9:31pm

[ohohoreilly]

Closing as part of a sweep of the open-PR queue. Not a judgement on the work — reopen if you still want it and I will help get it current.

Opened 2026-05-04 and now conflicting with master. At this distance a rebase is usually more work than redoing the change against current code, and the surrounding code has moved a long way underneath "fix(editor): allow external URL links in block content".

@jwalkingjew — if the idea still stands but the branch does not, a fresh PR or a ticket is probably a better route than reviving this one.

Nothing is discarded: the branch and its history remain, and reopening costs a click.

Context: 74 PRs were open, 25 older than two months, the oldest from February. The point is to make the queue mean something so genuinely ready work is visible rather than buried — #2449 sat ready for three days this week partly because of the noise. Only non-draft, conflicting PRs are in scope; drafts and anything still mergeable are being left alone.