ui: inline trash icon on backup-restore dialog

User feedback: the only way to clean up old backups was to hand-edit
the profile directory, since the "Choose backup to restore" dialog
exposed select-or-cancel and no delete affordance.

Add an addChoice overload on SelectionDialog that takes a per-row
delete callback. Each row is rendered as a horizontal layout —
QCommandLinkButton (stretched) plus a small auto-raised QToolButton
with a trash icon (user-trash → edit-delete → SP_TrashIcon
fallback chain). Clicking the trash prompts for confirmation,
invokes the callback, and hides the row on success; the QCommandLink
remains live for restore. numChoices() now counts visible rows
under scrollAreaWidgetContents so the "no backups" check stays
correct as rows disappear.

MainWindow::queryRestore wires the callback to delete the matching
Plugins.txt.<ts>, loadorder.txt.<ts>, and lockedorder.txt.<ts>
triplet via QFile::remove.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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