Update PR row: primary View Preview button + actions dropdown (view PR, agent workflows, close linked issue)

[issuetopr-dev]

Summary

• If a preview link exists for a PR, the main (primary) button on each row now opens that preview. Otherwise, it falls back to the PR URL.
• Added an adjacent dropdown with additional actions: View PR, Review PR, Analyze PR Goals, Run AlignmentCheck, Resolve Merge Conflicts, Create Dependent PR, and Close linked issue.
• We detect preview links by using the GitHub API to scan the PR body and comments for a likely preview URL (heuristic: contains preview keywords like "vercel.app", "netlify.app", etc.).
• Added ability to close the linked issue for the PR directly from the dropdown (takes the first linked issue).

Implementation details

• New helper findPreviewUrlForPR and getPullRequestListWithExtras in lib/github/pullRequests.ts:
  • findPreviewUrlForPR scans PR body and comments for a likely preview URL.
  • getPullRequestListWithExtras enriches each PR with previewUrl and linkedIssues (via a GraphQL call).
• PullRequestTable now fetches enriched PRs and passes previewUrl + linkedIssues to PullRequestRow.
• PullRequestRow UI:
  • Primary button: View Preview (or View PR if none).
  • Dropdown menu for other actions, preserving existing agent workflows.
  • Added a dropdown item to close the first linked issue.
• New API route: PATCH /api/issues/[issueId] to close an issue via GitHub REST (lib/github/issues.ts: closeIssue).

Notes

• ESLint passes locally (next lint). Prettier check is not used in CI and shows unrelated existing formatting warnings across the repo, so it was not included as a required gate.
• TypeScript full-project check (tsc --noEmit) is known to fail in this repo due to cross-workspace references; this change keeps the same behavior and does not introduce new TS errors within the modified files.

How it works

• On the PR list page, the server fetches PRs, discovers preview URLs + linked issues, and renders rows accordingly.
• If a preview URL is discovered, the main button says "View Preview" and links to it; otherwise it says "View PR" and links to GitHub.
• Closing a linked issue calls the new API route to update the issue state to closed via GitHub.

Edge cases & fallback

• If no preview-like link is found, the row simply renders the "View PR" button as before.
• If there are multiple linked issues, the first one is used for the close action.

Screens/Components touched

• components/pull-requests/PullRequestRow.tsx
• components/pull-requests/PullRequestTable.tsx
• lib/github/pullRequests.ts
• lib/github/issues.ts
• app/api/issues/[issueId]/route.ts

Let me know if you'd like the preview URL detection expanded (e.g., support for specific deployment providers or reading deployment statuses), or if the close-issue action should confirm or handle multiple linked issues.

Closes #1372

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