[TRUNK-17695] Document impacted targets visualization in merge graph UI

[samgutentag]

Summary

• Added "Impacted targets in the graph" subsection to the Graph view on the Monitor queue status page — covers per-PR tooltips and overlapping targets toggle
• Added "Impacted targets on the PR detail page" subsection — covers the View impacted targets modal with IMPACTS_ALL, specific targets, and no targets states

Note: The metrics filtering by impacted targets is already documented in merge-queue/administration/metrics.md, so no update needed there.

Context links

• trunk-io/trunk2#2406, #2414, #2457, #3043, #3099 (all merged)

Files changed

• merge-queue/using-the-queue/monitor-queue-status.md — new subsections under Graph view

Open questions

1. Is the toggle labeled "Show impacted targets" or something else?
2. Are there screenshots available for the graph with impacted targets enabled?
3. Does the impacted targets modal show on PRs in Single mode, or only Parallel mode?

Test plan

• Check GitBook preview
• Verify link to parallel queues page works

🤖 Generated with Claude Code

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[claude]

Claude finished @samgutentag's task in 2m 22s —— View job

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Review complete

• Gather context
• Read changed file
• Review for typos, grammar, formatting, and documentation best practices
• Post inline comments for specific issues
• Final summary

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The new documentation is clearly written and well-structured overall. A few issues to address before merging:

Blocking concerns:

1. Open questions unresolved — The PR body flags three open questions about content accuracy (toggle label, screenshots, Single vs. Parallel mode applicability). These should be resolved before merging to avoid shipping inaccurate docs.
2. Structural placement — The #### Impacted targets on the PR detail page subsection is nested under ### Graph view, but it describes a different part of the UI. See inline comment at line 59.

Non-blocking suggestions:

• Line 65: IMPACTS_ALL is bold in the bullet label but unformatted in the inline reference in the same bullet. See suggestion at line 65.
• Consider using backtick code formatting (`IMPACTS_ALL`) for the enum value throughout for semantic clarity.
• Adding screenshots (open question ok #2) would significantly improve this section's usability.

[claude]

Structural placement concern: This subsection discusses the PR detail page, but it's nested under ### Graph view. The PR detail page is a separate UI section, documented later under ## Pull request details. Consider either:

1. Moving this subsection under ## Pull request details, or
2. Adding a brief note that users can access the targets modal from the graph by clicking through to a PR's detail page, to justify the placement here.

As written, readers browsing the "Graph view" section may find the PR detail page content unexpected here.

[claude]

Formatting inconsistency: IMPACTS_ALL is bolded (**IMPACTS\_ALL**) in the bullet label on line 63, but appears unformatted inline here. For consistency, apply the same formatting:

Suggested change

	* **No targets uploaded**: No targets were provided, so the PR is treated as IMPACTS\_ALL for safety.
	* **No targets uploaded**: No targets were provided, so the PR is treated as **IMPACTS\_ALL** for safety.

Alternatively, consider using backtick code formatting (`IMPACTS_ALL`) throughout, since this appears to be an enum/constant value.

[claude]

Open question (from PR description): The toggle is referred to as "Show impacted targets" here. Please confirm this matches the exact label in the UI before merging — the PR body flags this as an open question.

[claude]

Open question (from PR description): Does the View impacted targets modal appear for PRs in Single mode as well, or only in Parallel mode? If it's Parallel-mode-only, add a qualifier here similar to the note in the section above:

When running in Parallel mode, on any PR's detail page…