feat(notify): desktop notification per announcement with a Cancel button
Every playing announcement now shows a desktop notification with its text and, on Linux, a Cancel button (Abbrechen for German) that stops exactly that announcement; the notification is closed when the announcement ends. This brings back what the old talk.sh had with notify-send --action, as a default: a long announcement can be cut short without a terminal. Implementation: the freedesktop Notifications service on the session bus via godbus (pure Go): one connection per process, Notify with the action list, ActionInvoked dispatched to the announcement, CloseNotification at the end, expire_timeout 0 so the button stays for the whole announcement. Without a session bus the notify-send fallback shows a plain notification; macOS and Windows show one without a button for now. queue.CancelItem(id) cancels only the playing item. Config [notify] on_speak (default true, env TALK_NOTIFY). `talk test --toast` now shows the real thing and waits for a click; `talk doctor` names the service and whether it supports the button. Config hygiene found on the way: a key written below a [table] header belongs to that table in TOML (lang under [voice] was silently ignored). config.Load now collects unknown keys (undecoded ones and non-language keys under [voice.<provider>]) and `talk doctor` warns with the hint. Tests: process test on a private dbus-daemon with a fake org.freedesktop.Notifications service (Notify payload, cancel click aborts the synthesis, CloseNotification), queue.CancelItem, config keys. All test binaries point DBUS_SESSION_BUS_ADDRESS at a dead socket so no test ever pops a notification on the developer's desktop. flake vendorHash updated for the new dependency. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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