Keep the scroll fade at the screen edge on the queue's filter row

The fade that hints at more filters to the right was an element inside the
scrolling row, so it scrolled away with the chips instead of staying at the
edge; the comment on it claimed the opposite. It is now a mask on the strip
itself, applied only while there is more to scroll to (fadeOnOverflow in
ui.js sets data-more), so it stays put and disappears at the end instead of
dimming the last chip.

The Team and Admin tab strips had an always-on mask from the earlier
"Sources is cut off" fix, which dimmed their last tab even when fully
scrolled; they use the same mechanism now.

Web UI only: no endpoint or JSON shape changed, so nothing to mirror in
terdut-tui.

internal/web/static/app.css

@@ -395,16 +395,13 @@ input:focus, textarea:focus { outline: none; border-color: var(--accent); box-sh
 .chip .count { margin-left: 4px; opacity: 0.7; }
 /* Nothing in it: step back so the chips that have something stand out. */
 .chip .count.zero { opacity: 0.4; }
-/* An overlay, not a flex item: absolute against .chips' own (non-scrolling)
-   box stays flush with its real right edge regardless of scroll position,
-   which turned out not to be true of position:sticky here — as a flex
-   item, its sticky offset interacted with the row's gap and its own
-   negative margin, landing short of the edge by about one gap's width. */
-.chips-fade {
-  position: absolute; top: 0; right: 0; bottom: 0;
-  width: 24px;
-  background: linear-gradient(to right, transparent, var(--bg));
-  pointer-events: none;
+/* A scrolling strip fades on the right edge while there is more to scroll to
+   (fadeOnOverflow in ui.js sets data-more). A mask on the strip itself, not an
+   element inside it: anything inside a scroller scrolls away with the content,
+   which is what the old overlay did. */
+[data-more] {
+  -webkit-mask-image: linear-gradient(90deg, #000 calc(100% - 28px), transparent);
+  mask-image: linear-gradient(90deg, #000 calc(100% - 28px), transparent);
 }
 
 /* ---------- lists ---------- */
@@ -886,7 +883,6 @@ kbd {
   /* The pane is 340-420px wide and a mouse cannot scroll a row whose scrollbar
      is hidden, so the chips wrap here instead: Archived stays reachable. */
   .pane-list .chips { flex-wrap: wrap; overflow-x: visible; }
-  .chips-fade { display: none; }
   /* With nothing selected there is no detail to show next to, so the list
      takes the whole row instead of leaving the second column as dead space
      around the placeholder text. Selecting an incident (.has-detail) drops
@@ -1236,11 +1232,6 @@ button.rota-week:hover { background: var(--surface-2); color: var(--text); }
   overflow-x: auto; scrollbar-width: none;
 }
 .subnav::-webkit-scrollbar { display: none; }
-/* A fade on the right edge says "there is more" where the strip overflows;
-   the desktop width fits every entry, so it is phone-only. */
-@media (max-width: 899px) {
-  .subnav { -webkit-mask-image: linear-gradient(90deg, #000 calc(100% - 28px), transparent); mask-image: linear-gradient(90deg, #000 calc(100% - 28px), transparent); }
-}
 .subnav-link {
   flex: none;
   padding: 8px 12px; margin-bottom: -1px;

internal/web/static/js/admin.js

@@ -13,7 +13,7 @@
 // gate.
 
 import * as api from './api.js';
-import { h, clear, spinner, confirm, menuCard, ssoBadge, SSO_MANAGED } from './ui.js';
+import { h, clear, spinner, confirm, menuCard, ssoBadge, SSO_MANAGED, fadeOnOverflow } from './ui.js';
 import { state, myID } from './state.js';
 
 const view = () => document.getElementById('view-admin');
@@ -111,6 +111,7 @@ function subnav() {
     })));
   // On a phone the strip overflows; bring the open section into view so a
   // tab past the edge (Sources, Switches) is never the one that is hidden.
+  fadeOnOverflow(nav);
   requestAnimationFrame(() => nav.querySelector('[aria-current]')
     ?.scrollIntoView({ inline: 'center', block: 'nearest' }));
   return nav;

internal/web/static/js/queue.js

@@ -1,7 +1,7 @@
 // The incident queue: filter chips and a list of incident rows.
 
 import * as api from './api.js';
-import { h, clear, badge, severityBadge, emptyState, spinner } from './ui.js';
+import { h, clear, badge, severityBadge, emptyState, spinner, fadeOnOverflow } from './ui.js';
 import { ago, until, isFuture, severityClass, labelSummary } from './format.js';
 import { state, myID, onTeamChange } from './state.js';
 import * as onboarding from './onboarding.js';
@@ -118,6 +118,10 @@ function chipCount(id) {
   return null;
 }
 
+// Set the first time the chips are drawn: the strip element is the same one
+// for the life of the page, so one scroll listener and one observer will do.
+let chipsFade;
+
 function renderChips() {
   const el = document.getElementById('queue-filters');
   const chips = FILTERS.map((f) => {
@@ -135,9 +139,9 @@ function renderChips() {
   // There are no team chips here: the team selector in the sidebar (and in the
   // phone's top bar) is the one place the team is chosen, and chips for it
   // would be the same choice offered twice.
-  chips.push(h('span', { class: 'chips-fade', 'aria-hidden': 'true' }));
-
   clear(el, chips);
+  chipsFade ??= fadeOnOverflow(el);
+  chipsFade();
 }
 
 function renderList() {

internal/web/static/js/team.js

@@ -18,7 +18,7 @@
 // than no form, but it is not the thing enforcing anything.
 
 import * as api from './api.js';
-import { h, clear, spinner, confirm, icon, openSheet, closeSheet, menuCard, badge, labelChip, ssoBadge, SSO_MANAGED } from './ui.js';
+import { h, clear, spinner, confirm, icon, openSheet, closeSheet, menuCard, badge, labelChip, ssoBadge, SSO_MANAGED, fadeOnOverflow } from './ui.js';
 import { state, currentTeam, onTeamChange, users as allUsers, myID } from './state.js';
 import { isoDate, addDays, mondayOf, isoWeek, initial, ago, when, duration } from './format.js';
 
@@ -177,6 +177,7 @@ function subnav() {
     })));
   // On a phone the strip overflows; bring the open section into view so a
   // tab past the edge (Sources, Switches) is never the one that is hidden.
+  fadeOnOverflow(nav);
   requestAnimationFrame(() => nav.querySelector('[aria-current]')
     ?.scrollIntoView({ inline: 'center', block: 'nearest' }));
   return nav;

internal/web/static/js/ui.js

@@ -32,6 +32,21 @@ export function clear(el, ...children) {
   return el;
 }
 
+// Marks a horizontally scrolling strip with data-more while there is more of it
+// to the right, which the CSS turns into a fade on that edge. The fade is a
+// mask on the strip itself, so it stays put at the edge of the screen: a fade
+// drawn as a child of the scroller scrolls away with the content. Returns the
+// update function, for a strip whose contents change under it.
+export function fadeOnOverflow(el) {
+  const update = () => {
+    el.toggleAttribute('data-more', el.scrollLeft + el.clientWidth < el.scrollWidth - 1);
+  };
+  el.addEventListener('scroll', update, { passive: true });
+  if (typeof ResizeObserver === 'function') new ResizeObserver(update).observe(el);
+  update();
+  return update;
+}
+
 // Stroke icons, 24×24. Built as SVG nodes so the CSP needs no inline anything.
 const ICONS = {
   alertTriangle: ['M12 4l9.5 16.5h-19z', 'M12 10v4.5', 'M12 17.5h.01'],