jobq-graph: re-add per-node cancel button

Fixes #3067.

<hive-jobq-graph> gains a `cancellable` attribute: any non-terminal
node (Pending/Running/Finishing) gets a small cancel button, and a
click dispatches `hive-jobq-graph-cancel` (`detail: { id }`) rather
than POSTing anything itself -- which endpoint actually cancels a
node is the host's domain concept, same "push data out, host decides"
shape `hive-jobq-graph-update` already uses.

builds.js turns it on for R3BU1LD QU3U3, confirms via themedConfirm,
then POSTs the existing `/api/rebuild-queue/{id}/cancel` endpoint.
No manual refresh needed -- cancelling flips node state, which
already fires rebuild_queue_changed over SSE, and the page's existing
handler for that tick already calls jobqGraphEl.refresh().

Also removed ~130 lines of dead `.rqe-*` CSS in system-sections.css
left over from the bespoke pre-<hive-jobq-graph> queue renderer
(confirmed zero JS references before deleting each rule; kept the
still-used `.rqe-kind`/`.rqe-agent`/`.rqe-source*`).

docs/web-ui/dashboard.md's R3BU1LD QU3U3 section updated to match
current behaviour (cancel button, waits-on text instead of the old
"no per-node actions" note, sibling order no longer implies anything
since deps render as text not a reordered rail).

docs/web-ui/dashboard.md

@@ -232,21 +232,28 @@ dashboard pages treat the tick as a pure refetch trigger).
 
 Each row is one root graph node (`parent: null`); a multi-step op's
 per-agent subgraphs and sub-steps render as nodes within that one
-entry (structural `parent` edges define the tree, `deps` edges order
+entry (structural `parent` edges define the tree; sibling order is
-siblings). A row shows a state glyph (`⏸` pending / `▶` running /
+array order, unchanged from the wire). A row shows a state glyph (`⏸`
-`◐` finishing — own work done, a sub-node still running / `✔` done /
+pending / `▶` running / `◐` finishing — own work done, a sub-node
-`✖` failed / `⊘` cancelled / `·` skipped) and each step's own
+still running / `✔` done / `✖` failed / `⊘` cancelled / `·` skipped)
-label/agent. **No source chip, kind label, cancel button, timing, or
+and each step's own label/agent. A `Node`-kind dep on a sibling shows
-build-log deep-link on rows** — the generic component has no
+as a plain "waits on: `<label>`" text line under the row — an earlier
-per-node action affordances or entry-level metadata (no equivalent of
+gutter-rail version was reverted (it broke visually whenever a nested
-the old `DagView`'s `source`/`reason`/`created_at`, which were
+subtree sat between the two related rows; text has no such gap).
-`NodeKind::Dag`-specific fields the generic wire doesn't carry); per
+`builds.js` mounts the element with `cancellable` set, which turns on
-mara's steer on hyperhive#2812 ("dont feel constrained by what the ui
+a per-node cancel button (`✕`) on any non-terminal row — the button
-does currently"), the first cut presents what the endpoint actually
+dispatches `hive-jobq-graph-cancel`, and the page does the actual
-gives rather than reconstructing the old per-row chrome. Settled
+`POST /api/rebuild-queue/{id}/cancel`, matching the wire event as its
-entries render their **full step tree**, not just a bare summary —
+own domain concept (the component knows nothing about that endpoint).
-unlike the old `DagView` projection, this wire does not filter `Done`
+**Still no source chip, kind label, timing, or build-log deep-link on
-nodes out.
+rows** — no equivalent of the old `DagView`'s `source`/`reason`/
+`created_at`, which were `NodeKind::Dag`-specific fields the generic
+wire doesn't carry; per mara's original steer ("dont feel constrained
+by what the ui does currently"), rows present what the endpoint
+actually gives rather than reconstructing the old per-row chrome.
+Settled entries render their **full step tree**, not just a bare
+summary — unlike the old `DagView` projection, this wire does not
+filter `Done` nodes out.
 
 Below the queue, a **live build-log panel** (`#rebuild-live-log`,
 `renderRebuildLiveLog`) shows the currently-running rebuild's output

frontend/packages/dashboard/src/builds.js

@@ -13,6 +13,7 @@
 import { $, fmtAgeSecs, openStream, openBuildLogStream, initServerWarnings } from './common.js';
 import { el } from '@hive/shared/dom.js';
 import { bindAsyncForms } from '@hive/shared/forms.js';
+import { themedConfirm } from '@hive/shared/modal.js';
 import { fmtAgo, fmtDuration, truncate } from './util.js';
 import '@hive/shared/hive-tab-strip.js';
 import '@hive/shared/jobq-graph.js';
@@ -128,25 +129,46 @@ function renderMetaInputs(s) {
 
 // ─── rebuild queue ────────────────────────────────────────────────────────────
 // R3BU1LD QU3U3 is <hive-jobq-graph> directly (mara: "replace the build
-// queue tab with this component") — no hand-rolled
+// queue tab with this component") — no hand-rolled tree/roll-up rendering
-// tree/roll-up/cancel-button rendering here anymore. The component owns
+// here anymore. The component owns fetching GET /api/jobq/graph and its
-// fetching GET /api/jobq/graph and its own refresh(); this page just
+// own refresh(); this page just listens for its `hive-jobq-graph-update`
-// listens for its `hive-jobq-graph-update` event to keep `jobqNodes` (the
+// event to keep `jobqNodes` (the flat array) in sync for the two things
-// flat array) in sync for the two things the generic view doesn't render:
+// the generic view doesn't render itself: the count-pill and the live-log
-// the count-pill and the live-log panel below. No cancel button or
+// panel below.
-// build-log deep-link on rows either — the generic component has no
+//
-// per-node action affordances; per "dont feel constrained by what the ui
+// Cancel is the one action this page *does* wire up: the
-// does currently," not reinventing those here for the first cut.
+// `cancellable` attribute turns on the component's own per-node cancel
+// button, which dispatches `hive-jobq-graph-cancel` rather than posting
+// anything — the endpoint (`/api/rebuild-queue/{id}/cancel`) is this
+// page's domain concept, not the generic component's.
 function mountJobqGraph() {
   const root = $('rebuild-queue-section');
   if (!root) return;
   root.replaceChildren();
-  jobqGraphEl = el('hive-jobq-graph', { endpoint: '/api/jobq/graph' });
+  jobqGraphEl = el('hive-jobq-graph', { endpoint: '/api/jobq/graph', cancellable: '' });
   jobqGraphEl.addEventListener('hive-jobq-graph-update', (e) => {
     jobqNodes = e.detail.nodes || [];
     renderRebuildLiveLog();
     updateRebuildCount();
   });
+  jobqGraphEl.addEventListener('hive-jobq-graph-cancel', async (e) => {
+    const { id } = e.detail;
+    const node = jobqNodes.find((n) => n.id === id);
+    const label = node ? node.payload.label : 'node ' + id;
+    if (!(await themedConfirm({
+      message: `cancel ${label}? a group root cancels the whole subtree; a mid-tree node cancels just that branch.`,
+      danger: true, confirmLabel: '✕ cancel',
+    }))) return;
+    try {
+      const r = await fetch('/api/rebuild-queue/' + id + '/cancel', { method: 'POST' });
+      if (!r.ok) throw new Error('http ' + r.status);
+      // No manual refresh: cancel flips node state, which fires
+      // rebuild_queue_changed over SSE — the existing handler below
+      // already calls jobqGraphEl.refresh() on that tick.
+    } catch (err) {
+      console.error('cancel failed', err);
+    }
+  });
   root.append(jobqGraphEl);
 }
 

frontend/packages/dashboard/src/system-sections.css

@@ -105,15 +105,6 @@
   align-items: baseline;
   gap: 0.4em;
 }
-.rebuild-queue-entry.rqe-running {
-  border-color: var(--purple);
-  background: color-mix(in srgb, var(--purple) 12%, transparent);
-  animation: badge-pulse 1.6s ease-in-out infinite;
-}
-.rebuild-queue-entry.rqe-failed { border-color: var(--red); color: var(--red); }
-.rebuild-queue-entry.rqe-cancelled { opacity: 0.6; }
-.rebuild-queue-entry.rqe-done { opacity: 0.7; color: var(--green); }
-.rqe-state { font-weight: bold; min-width: 1.2em; text-align: center; }
 .rqe-kind { color: var(--cyan); }
 .rqe-agent { color: var(--amber); font-weight: bold; }
 .rqe-source {
@@ -130,134 +121,6 @@
 .rqe-source-auto_update { color: var(--muted); }
 .rqe-source-crash_recover { color: var(--amber); border-color: var(--amber); }
 .rqe-source-approval { color: var(--green); border-color: var(--green); }
-.rqe-when { color: var(--muted); font-size: 0.85em; }
-.rqe-reason { color: var(--muted); font-size: 0.85em; flex: 1 1 auto; }
-/* Per-node DAG chain: one chip per primitive node, dependency order. */
-.rqe-nodes {
-  flex-basis: 100%;
-  margin: 0.15em 0 0 1.8em;
-  font-size: 0.85em;
-  display: flex;
-  flex-wrap: wrap;
-  align-items: baseline;
-  gap: 0.15em;
-}
-/* ─── jobq node tree (replaces .rqe-nodes for tree-structured payloads) ──── */
-.rqe-nodes-tree {
-  flex-basis: 100%;
-  margin: 0.25em 0 0 1.8em;
-  font-size: 0.85em;
-  display: flex;
-  flex-direction: column;
-  gap: 3px;
-}
-.rqe-tree-row {
-  display: flex;
-  align-items: center;
-  gap: 0;
-  min-height: 1.6em;
-}
-/* Guide column: fixed-width spacer that optionally draws a vertical guide
-   line through rows where a sibling of an ancestor continues below. */
-.rqe-tree-guide,
-.rqe-tree-connector {
-  flex-shrink: 0;
-  width: 1.1em;
-  align-self: stretch;
-  position: relative;
-}
-.rqe-tree-guide-line::before {
-  content: '';
-  position: absolute;
-  left: 50%;
-  top: 0;
-  bottom: 0;
-  border-left: 1px solid var(--border);
-}
-/* Connector: vertical stem from top, horizontal spur to the right.
-   Last child (└): stem goes top→center. Mid child (├): stem is full height. */
-.rqe-tree-connector::before {
-  content: '';
-  position: absolute;
-  left: 50%;
-  top: 0;
-  bottom: 50%;
-  border-left: 1px solid var(--border);
-}
-.rqe-tree-connector-mid::before {
-  bottom: 0;
-}
-.rqe-tree-connector::after {
-  content: '';
-  position: absolute;
-  top: 50%;
-  left: 50%;
-  right: 0;
-  border-top: 1px solid var(--border);
-}
-.rqe-node {
-  padding: 0.05em 0.45em;
-  border: 1px solid var(--border);
-  border-radius: 0.7em;
-  color: var(--muted);
-  white-space: nowrap;
-}
-.rqe-node-running {
-  color: var(--purple);
-  border-color: var(--purple);
-  animation: badge-pulse 1.6s ease-in-out infinite;
-}
-.rqe-node-done { color: var(--green); border-color: color-mix(in srgb, var(--green) 45%, transparent); }
-.rqe-node-failed { color: var(--red); border-color: var(--red); }
-.rqe-node-cancelled { opacity: 0.55; text-decoration: line-through; }
-/* Not-taken outcome branch — expected, quiet, distinct from cancelled
-   (dimmed only, no strikethrough: this wasn't dropped mid-flight, it was
-   never going to run). */
-.rqe-node-skipped { opacity: 0.5; }
-.rqe-node-arrow { color: var(--muted); }
-.rqe-node-log { margin-left: 0.1em; text-decoration: none; }
-
-.rqe-error {
-  flex-basis: 100%;
-  margin: 0.3em 0 0;
-  padding: 0.3em 0.5em;
-  background: color-mix(in srgb, var(--red) 10%, transparent);
-  border-left: 2px solid var(--red);
-  color: var(--red);
-  font-size: 0.8em;
-  white-space: pre-wrap;
-}
-.rqe-cancel {
-  margin-left: auto;
-}
-.rqe-cancel-btn {
-  background: transparent;
-  border: 1px solid var(--purple-dim);
-  color: var(--muted);
-  border-radius: 999px;
-  width: 1.6em;
-  height: 1.6em;
-  font-size: 0.85em;
-  line-height: 1;
-  padding: 0;
-  cursor: pointer;
-  display: inline-flex;
-  align-items: center;
-  justify-content: center;
-  transition: color 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
-}
-.rqe-cancel-btn:hover:not(:disabled),
-.rqe-cancel-btn:focus-visible {
-  color: var(--red);
-  border-color: var(--red);
-  box-shadow: 0 0 8px -2px var(--red);
-  outline: none;
-}
-.rqe-cancel-btn:disabled {
-  opacity: 0.5;
-  cursor: default;
-}
-
 /* ─── running-rebuild live log (renderRebuildLiveLog in builds.js) ──────────
    Streams the currently-running rebuild's build log inline under the queue.
    Hidden (native `hidden` attr) when nothing is building. Used on

frontend/packages/shared/src/jobq-graph/hive-jobq-graph.css

@@ -53,6 +53,30 @@
   color: var(--fg);
 }
 
+.jg-cancel-btn {
+  margin-left: auto;
+  background: transparent;
+  border: 1px solid var(--muted);
+  color: var(--muted);
+  border-radius: 999px;
+  width: 1.4em;
+  height: 1.4em;
+  font-size: 0.8em;
+  line-height: 1;
+  padding: 0;
+  cursor: pointer;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  transition: color 0.15s ease, border-color 0.15s ease;
+}
+.jg-cancel-btn:hover,
+.jg-cancel-btn:focus-visible {
+  color: var(--red);
+  border-color: var(--red);
+  outline: none;
+}
+
 .jg-data {
   margin: 0.1em 0 0 1.6em;
   font-size: 0.85em;

frontend/packages/shared/src/jobq-graph/hive-jobq-graph.js

@@ -10,19 +10,19 @@
 // a build-log link, ...) does its own thing on top; this is the generic
 // floor every jobq gets for free.
 //
-// `Node`-kind dep edges get a plain "waits on: <label>" line under the
+// `Node`-kind dep edges get a plain "waits on: <label>" text line — see
-// dependent node — see `buildTree`'s `_waitsOn` resolution below. (A
+// `buildTree`'s `_waitsOn` resolution. `cancellable` attribute adds a
-// gutter rail was tried first; dropped since it spans by sibling-array
+// per-node cancel button dispatching `hive-jobq-graph-cancel` instead of
-// position, and a nested subtree between two siblings breaks that into
+// POSTing anything itself — see `CANCELLABLE_STATES` + the click-delegate
-// disconnected ticks. Text has no such gap.)
+// in `connectedCallback` below for both.
 //
 // Usage: <hive-jobq-graph endpoint="/api/jobq/graph"></hive-jobq-graph> —
-// self-fetches on connect. `.refresh()` (public) re-fetches + re-renders;
+// self-fetches on connect. `.refresh()` re-fetches + re-renders;
-// `.render(nodes)` (public) renders host-pushed data directly, no fetch.
+// `.render(nodes)` renders host-pushed data directly, no fetch. Every
-// Every render dispatches a bubbling/composed `hive-jobq-graph-update`
+// render dispatches a bubbling/composed `hive-jobq-graph-update` event
-// event (`detail: { nodes }`) so a host needing the raw list for
+// (`detail: { nodes }`) so a host needing the raw list for something the
-// something the tree doesn't show (a count badge, a live-log panel)
+// tree doesn't show (a count badge, a live-log panel) listens instead of
-// listens instead of running its own parallel fetch.
+// running its own parallel fetch.
 //
 // Shadow DOM + own styles, per instruction — unlike light-DOM
 // <hive-tab-strip>, this renders a whole subtree nothing else needs to
@@ -43,6 +43,11 @@ const STATE_GLYPH = {
   Skipped: '·',
 };
 
+// Non-terminal states a cancel button makes sense on. Finishing is
+// included — "own logic done, children still running" is still a subtree
+// worth stopping early.
+const CANCELLABLE_STATES = new Set(['Pending', 'Running', 'Finishing']);
+
 // Build a parent/child tree from the flat wire array. `parent` (structural
 // grouping) defines tree shape. Sibling order follows array order, which is
 // already root-then-subtree per root per `GraphWire::wire_snapshot`'s own
@@ -94,8 +99,9 @@ function renderDataList(data) {
   return dl;
 }
 
-function renderNode(n) {
+function renderNode(n, cancellable) {
   const glyph = STATE_GLYPH[n.state] || '?';
+  const showCancel = cancellable && CANCELLABLE_STATES.has(n.state);
   const row = el('div', { class: 'jg-row' },
     el('span', {
       class: 'jg-state jg-state-' + n.state.toLowerCase(),
@@ -103,6 +109,12 @@ function renderNode(n) {
     }, glyph),
     ' ',
     el('span', { class: 'jg-label' }, n.payload.label),
+    showCancel
+      ? el('button', {
+        type: 'button', class: 'jg-cancel-btn', 'data-cancel-id': String(n.id),
+        title: 'cancel ' + n.payload.label,
+      }, '✕')
+      : null,
   );
   const wrap = el('div', { class: 'jg-node' }, row);
   if (n._waitsOn && n._waitsOn.length) {
@@ -111,7 +123,7 @@ function renderNode(n) {
   const data = renderDataList(n.payload.data);
   if (data) wrap.append(data);
   if (n.error) wrap.append(el('pre', { class: 'jg-error' }, n.error));
-  for (const child of n._children) wrap.append(renderNode(child));
+  for (const child of n._children) wrap.append(renderNode(child, cancellable));
   return wrap;
 }
 
@@ -124,6 +136,18 @@ class HiveJobqGraph extends HTMLElement {
     this._root = attachShadowCss(this, graphCss);
     this._body = el('div', { class: 'jg-body' });
     this._root.append(this._body);
+    // One delegated listener rather than a per-button one — cancel buttons
+    // come and go on every re-render, a delegated listener on the stable
+    // container doesn't need rebinding.
+    this._body.addEventListener('click', (e) => {
+      const btn = e.target.closest('.jg-cancel-btn');
+      if (!btn) return;
+      this.dispatchEvent(new CustomEvent('hive-jobq-graph-cancel', {
+        detail: { id: Number(btn.dataset.cancelId) },
+        bubbles: true,
+        composed: true,
+      }));
+    });
     this.refresh();
   }
 
@@ -154,7 +178,8 @@ class HiveJobqGraph extends HTMLElement {
       this._body.append(el('p', { class: 'jg-empty' }, 'empty'));
     } else {
       const roots = buildTree(nodes);
-      for (const root of roots) this._body.append(renderNode(root));
+      const cancellable = this.hasAttribute('cancellable');
+      for (const root of roots) this._body.append(renderNode(root, cancellable));
     }
     this.dispatchEvent(new CustomEvent('hive-jobq-graph-update', {
       detail: { nodes: nodes || [] },