- New pure-vanilla progressive formatter that turns typed digits into
(123) 456-7890 (or 1 (800) 555-1212 for +1 numbers) on the fly.
- Works for free-form input: typing, pasting, editing anywhere, backspacing,
extra chars, etc. — no hard mask or input restrictions.
- Applied to:
- The Preact <rpt-booking> widget phone field (home page quick booking + details).
- The final Drupal confirmation form at /schedule/book (via lightweight
enhancer + .rpt-phone class).
- Prefills last_name / phone / comments on the confirmation form when the
widget was used to pick the slot (so collected phone isn't lost).
- No new dependencies whatsoever:
* Zero npm / package.json / composer changes.
* Zero additional CDN / external scripts (uses native String.replace,
regex, and input event + selection APIs only).
* The new js/phone-format.js is simply attached via the pre-existing
'app' library (already loaded on all riverside_pt.* routes).
* Formatter logic duplicated in the ESM component (tiny pure function).
- The two other modified files (calendar.css, calendar.js) were left
uncommitted as they are unrelated to this feature.
