Follow-up to the themed-modal component: route every remaining native
browser dialog through modal.js so nothing falls back to the OS chrome.
- modal.js: add themedPrompt (input dialog) + themedToast (non-blocking
transient notification, info/error/ok) alongside openDialog/themedConfirm.
- Migrate call sites: bindAsyncForms confirm/prompt/alerts (common.js),
the answer-validation alert (call.js), the M0V3 reparent confirm + action
toasts (tabs.js), and the schedule form/cancel/fire confirms + validation
and error alerts (schedules.js).
- UX: blocking modal for confirms/prompts; non-blocking toast for transient
errors + validation. Destructive confirms keep the danger styling.
- CSS for the toast stack + prompt input.
common.js <-> modal.js is a safe deferred import cycle (usage is call-time
only); esbuild bundles it clean.
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