Fixes #37.
In a repo group with more than 25 waiting PRs, the last row, "N more on tangled.org…", opened the first PR the group already lists. It now opens the repo's pull list, https://tangled.org/<repoDid>/pulls. That URL comes from the PR's own URL, and tangled.org redirects it to /<owner>/<name>/pulls. No new settings key, protocol message or state.
A unit test covers the URL. The headless smoke test also adds 30 copies of a PR to one repo, activates the row with opening stubbed out, and checks it went to the pull list. The menu looks the same as before.
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