fix(web): keep merge pending until refresh

[flamboh]

What Changed

The Merge button now stays pending until refreshed PR data confirms the merge.

Why

The merge command finished before the detail refresh, so stale open-state data briefly made the Merge button clickable again.

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

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Created by GPT-5.6-sol using the Codex harness in T3 Code.

Note

Keep pull request action controls pending until refreshed detail reflects the new state

• Previously, the pending/disabled state on action buttons (merge, close, reopen, draft, ready) cleared immediately after the mutation completed, before the refreshed pull request detail had arrived.
• Replaces the simple actionPending boolean in PullRequestDetailPanel with a pendingAction object that tracks the pull request key and action, and clears only when isPullRequestActionReflected confirms the new state is visible in the refreshed detail.
• Adds a new isPullRequestActionReflected utility in pullRequestDetail.logic.ts that checks whether the pull request's current state matches the expected post-action state.
• On action failure, pending is cleared immediately as before.

^{Macroscope summarized fd4ffaa.}

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[macroscopeapp]

Approvability

Verdict: Approved fd4ffaa

This is a well-scoped UI bug fix that prevents a merge button from briefly reappearing due to stale state after a successful action. The changes are self-contained with clear logic and unit tests, affecting only local state management with no backend or security implications.

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