Undocumented apps: per-device filter and wider device column; presence for Skip USMT

- Source Devices in the undocumented-apps list filters by device name, like
  the software columns; Devices and the action column take less room.
- Drop the one-click documented pick (Documented + Only ticked does it).
- Stage legend underline spans label and number.
- Device details title stays on one line; the name truncates instead.
- Presence sweep also pings devices under Skip USMT tags.

web/excel-filter.js

@@ -22,7 +22,7 @@
 
     const cardsQuery = window.matchMedia('(max-width: 1100px)');
     const sheetQuery = window.matchMedia('(max-width: 600px)');
-    const LIST_COLUMNS = /^(tags|missing software|specialty software)$/i;
+    const LIST_COLUMNS = /^(tags|missing software|specialty software|source devices)$/i;
     const SKIP_COLUMNS = /(^|\s)apps$/i;          // "Apps" button columns have nothing to filter
     const BLANK = '(Blanks)';
     const NO_READING = '(No reading)';             // space column: offline / cached / not checked
@@ -596,20 +596,6 @@
                 };
                 pick('Documented', isDocumented);
                 pick('Undocumented', v => !isDocumented(v));
-                // One click: devices whose apps ALL have an article ("easy" devices)
-                if (setMode) {
-                    const b = el('button', 'xf-pick xf-pick-main'); b.type = 'button';
-                    b.textContent = 'Devices with only documented apps';
-                    b.title = 'Show devices where every app in this column has a documentation article (and devices with none)';
-                    b.onclick = () => {
-                        search.value = '';
-                        opts.forEach(o => { o.row.hidden = false; o.cb.checked = o.v === 'None' || (o.v !== BLANK && isDocumented(o.v)); });
-                        setMode('subset');
-                        sync();
-                        ok.click();
-                    };
-                    pickBar.appendChild(b);
-                }
             }
             search.oninput = () => {
                 const q = search.value.trim().toLowerCase();