fix(web): keep PR merge confirmation stable while closing

[flamboh]

What Changed

The PR action dialog now keeps its confirmation action alive until the exit animation completes. Dialog visibility is tracked separately, and the action is cleared through onOpenChangeComplete after the popup has closed.

Confirmation copy also returns nothing when no action is pending.

Why

Confirming a merge immediately cleared the pending action. The existing copy logic treated every non-merge value, including the cleared state, as a close action while the dialog remained mounted for its exit animation. That briefly changed the dialog to “Close pull request?” before it disappeared.

Keeping the action until the close animation finishes preserves the original merge copy for the dialog’s entire visible lifetime.

UI Changes

Before

After

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

Made with GPT-5.6 Sol using the Codex harness in T3 Code.

Note

Fix PR merge confirmation dialog to retain content during close animation

Separates confirmOpen (visibility) from confirmAction (selected action) in PullRequestDetailPanel so the dialog content is not cleared until after the exit animation completes. Extracts confirmation copy (title, description, submit label, destructive flag) into a new describePullRequestConfirmation helper in pullRequestDetail.logic.ts, providing a single source of truth for dialog content across merge, auto-merge, and close actions.

^{Macroscope summarized f01d140.}

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[macroscopeapp]

Approvability

Verdict: Approved 6be0ea3

This PR fixes a UI animation glitch by separating dialog visibility state from action state, ensuring the confirmation content stays stable during the close animation. The helper function extraction is a clean refactor with no behavior changes to merge/close operations.

^{You can customize Macroscope's approvability policy. Learn more.}

Dismissing prior approval to re-evaluate fdadc64

Dismissing prior approval to re-evaluate 6be0ea3

[flamboh]

Closing: main now fixes this same bug the same way via #7381 (separate open state, action cleared in onOpenChangeComplete after the exit animation), so this PR is obsolete.