Commit triage marks from the toolbar, not just from the deck

[JacobPoteet]

The problem

Marks are made in the list with K/X/U as often as in the card deck, but the main window could only discard them. The pending-marks pill carried a Discard link and nothing else; committing meant Triage → a deck you didn't ask for (Open starts on the first unmarked file) → Review → Commit. Three clicks and a mode switch to reach the productive action, one click to destroy the work.

Why it was shaped that way

Commit_Click lived on TriageView — a control that has nothing to do with committing. CommitDialog was already independent of the deck (it takes a per-folder summary and a totals callback, nothing else), so only the call site was trapped in the overlay.

What changed

• TriageCommitFlow (new) owns the dialog, the issue [BUG] There is significant lag when deleting a video #1 preview-handle release, and the commit. The deck and the toolbar both call it, so neither can drift from the other or skip the handle release before files start moving. TriageView.Commit_Click is now three lines.
• The pill becomes the staging control: ✓ n · ✗ n, an optional in N folders, Review, a primary Commit, and Discard demoted into a ⋯ overflow — a destructive action shouldn't outrank the productive one.
• Review is reachable directly. TriageView.Open(vm, startInReview: true) opens onto the piles, skipping the deck. Previously the review screen could only be reached through the deck.
• Ctrl+Enter commits, registered as a window InputBinding rather than in FileList_KeyDown so it works from the filter box and rename bar too. Added to the status-bar hint chips next to K / X and U.
• MainViewModel.TotalsFor(bool) replaces the InScope filtering the dialog's caller did over the piles, which duplicated TriageSession.Pending.
• Dropped the trailing ellipsis from the three commit labels. Commit… is the Windows convention for "opens a dialog", but at 12px it reads as truncated text — not what you want on the button that touches the disk.

Reviewer notes

• CommitTriage's behaviour is untouched: same scoping, same undo entry, same partial-failure handling. This PR only changes who can reach it.
• The commit path from the toolbar clears Preview and re-shows it after the folder reload, mirroring what TriageView does with CardPreview.
• A pill-shaped button needs horizontal padding wider than its corner radius or the text sits where the background has already curved away; the Commit button is Padding="14,4" / CornerRadius="12" for that reason, noted in a comment.
• No test project, per the repo. Verified by building and driving the real app: marks made with K/X, pill renders the split counts, commit dialog opens from the toolbar.

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