Phone Jump button; docs never scroll sideways; presence sweep timing kept

- Jump (phones / tablets): find a device by name and scroll to its card, or
  jump to a section, the top or the bottom of the page.
- Documentation on phones: long paths, links, code and tables wrap; toolbar is
  title, last edited, then the buttons.
- Filter bar's Clear is the only clear button on phones.
- Card fields: search box and add list as wide as the field rows.
- Presence sweep: the demo uses the hourly schedule too, and the last sweep
  time survives a worker restart (a restart used to trigger an extra sweep).

README.md

@@ -62,6 +62,9 @@ a 1,300-device scope.
   *any*, *only* or *exactly* the ticked items. On software columns, one click shows devices
   whose apps all have a documentation article, and *Easiest first* sorts by how many apps
   still lack one.
+- **Phones and tablets**: tables become cards with one *Filter & sort* button, and a floating
+  *Jump* button finds a device by name (scrolls to its card without filtering) or jumps to any
+  section, the top or the bottom of the page.
 - **Custom View**: build your own table from any field (including days offline, last online,
   found in AD/SCCM/DNS and monitors), with drag-to-reorder, resizable and Excel-style
   filterable columns. Saved per browser.