Skip pushing branches with queued PRs

[skarim]

Detect merge queue status via the GitHub GraphQL API's mergeQueueEntry field and temporarily skip queued branches in push, sync, and submit commands. Unlike merged state (which is persisted permanently), queued state is transient because PRs may or may not be merged. Each command run re-checks queue status from the API, so if a PR is ejected from the queue it becomes active again on next run.

Changes:

• Add MergeQueueEntry to PullRequest GraphQL struct and PRDetails
• Add IsQueued()/IsSkipped()/QueuedBranches() to stack model
• Update ActiveBranches() family to exclude queued branches
• Skip queued branches in push, sync (rebase + push), and submit
• Add queued icon, style, and QUEUED state label in TUI view
• Add comprehensive tests for queued state handling

Closes github/pull-requests#24019

[Copilot]

Pull request overview

Adds merge-queue awareness so branches whose PRs are currently in GitHub’s merge queue are treated as temporarily “skipped” (similar to merged) across the CLI/TUI, and excluded from push/sync/submit workflows.

Changes:

• Extend GitHub GraphQL PR models to detect queued state via mergeQueueEntry, and propagate queued flags into stack state (transient, non-persisted).
• Update stack model helpers (IsQueued/IsSkipped, QueuedBranches, ActiveBranches family) and command behavior to skip queued branches.
• Update TUI/CLI rendering to show queued state (icon/label/separators) and add tests for queued handling.

Show a summary per file

File	Description
internal/tui/stackview/styles.go	Add queued icon and queued-specific styles.
internal/tui/stackview/model.go	Render queued separators/labels/icons and adjust layout calculations for queued state.
internal/tui/stackview/model_test.go	Add TUI tests for queued count and queued label rendering.
internal/stack/stack.go	Add queued/skipped helpers and exclude queued branches from “active” calculations.
internal/stack/stack_test.go	Add unit tests for queued behavior and non-persistence.
internal/github/github.go	Query/derive merge-queue status and expose it via PR models/details.
internal/github/github_test.go	Add test for PullRequest.IsQueued().
go.mod	Promote golang.org/x/sys to a direct dependency (used behind build tags).
cmd/view.go	Show queued separator/icon in --short output and include queued in JSON output.
cmd/view_test.go	Add tests validating queued output and ordering with merged.
cmd/utils.go	Populate transient BranchRef.Queued during PR sync.
cmd/sync.go	Skip queued branches during rebase/push reporting.
cmd/submit.go	Attempt to skip queued branches during submit flow.
cmd/push.go	Sync PR state first and skip queued branches during push.

Copilot's findings

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Comments suppressed due to low confidence (1)

cmd/sync.go:250

• The “no branches” message in Step 4 still says "(all merged)" even though queued branches are now excluded from branches := activeBranchNames(s) and you print a queued skip count just above. Update the message to include queued (e.g., merged or queued) so output matches behavior.

	if len(branches) == 0 {
		cfg.Printf("No active branches to push (all merged)")
	} else {

• Files reviewed: 14/14 changed files
• Comments generated: 3

[Copilot]

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