dashboard: queue log link opens BUILD L0GS tab instead of downloading

Fixes hyperhive#2895. The rebuild-queue tree's per-node log icon (the
printer-glyph "open" affordance next to each node in the R3BU1LD
QU3U3 tab) linked directly to the raw-text download endpoint
(/api/build-log/<node_id>/raw, which sets Content-Disposition:
attachment server-side) -- surprising, since nothing about that icon
signals "this leaves the app", unlike the other two explicit
"download raw"/"raw" links elsewhere on the page.

Point it at the existing ?id=N#buildlogs deep-link into the BUILD
L0GS tab instead (builds.js's fetchBuild already auto-expands +
scrolls to the matching row there). That deep-link's id is the
build-log history row id -- a different id space than the queue
tree's NodeId, and wasn't exposed to the frontend before (only a
derived has_log bool was). Added NodeView.build_log_id: Option<i64>
to the wire type alongside the existing has_log (kept, since
findLiveBuild's separate live-log-panel gate still needs a plain
bool), threaded through job_queue::mod.rs, updated hivectl's NodeView
test-helper literal.

The raw download is still one click away once on that row's BUILD
L0GS detail (the two already-explicit raw-download links are
untouched). cargo build/clippy/test clean across the three touched
crates (hive-c0re, hive-host-sock, hivectl); nix fmt clean; frontend
build verified (grep for build_log_id in the built builds.js bundle).

frontend/packages/dashboard/src/builds.js

@@ -376,12 +376,17 @@ function renderQueueEntry(entry) {
         chip.append(el('span', { class: 'rqe-node-agent' }, ' · ' + n.agent));
       }
       row.append(chip);
-      if (n.has_log) {
+      if (n.build_log_id != null) {
+        // Deep-links into the BUILD L0GS tab's rich view (auto-expands +
+        // scrolls to this row there, see fetchBuild's `?id=N` handling)
+        // rather than the raw-text download endpoint — a plain download
+        // is surprising here since nothing about a printer-glyph icon
+        // says "this leaves the app".  The raw download is still one
+        // click away once on that row.
         row.append(el('a', {
           class: 'rqe-log-link rqe-node-log',
-          href: '/api/build-log/' + n.id + '/raw',
-          target: '_blank',
-          title: 'download build log for ' + n.kind + ' node',
+          href: '/builds.html?id=' + n.build_log_id + '#buildlogs',
+          title: 'view build log for ' + n.kind + ' node',
         }, '⎙'));
       }
       treeRoot.append(row);

hive-c0re/src/job_queue/mod.rs

@@ -559,7 +559,8 @@ impl QueueInner {
             } else {
                 Vec::new()
             };
-            let has_log = self.node_rt.get(&id).and_then(|r| r.build_log_id).is_some();
+            let build_log_id = self.node_rt.get(&id).and_then(|r| r.build_log_id);
+            let has_log = build_log_id.is_some();
             // `node.parent` is the structural jobq parent. Top-level nodes
             // have `parent == Some(container)` (direct children of the Dag
             // container); those become `parent: None` on the wire since the
@@ -581,6 +582,7 @@ impl QueueInner {
                 approval_id,
                 inputs,
                 has_log,
+                build_log_id,
                 parent,
             });
         }

hive-host-sock/src/jobs.rs

@@ -111,6 +111,12 @@ pub struct NodeView {
     /// store-only nodes don't render a link that 404s.
     #[serde(default)]
     pub has_log: bool,
+    /// The underlying build-log history row id, when this node has a
+    /// captured log (`Some` iff `has_log`). Lets the client deep-link to the
+    /// rich BUILD L0GS tab view (`/builds.html?id=<id>#buildlogs`) instead of
+    /// only the raw-text download endpoint.
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub build_log_id: Option<i64>,
     /// Structural parent in the jobq tree — `None` for top-level nodes
     /// (direct children of the DAG container). Sub-nodes carry the id of
     /// their containing parent node. The client uses this to render the

hivectl/src/dag_progress.rs

@@ -343,6 +343,7 @@ mod tests {
             approval_id: None,
             inputs: vec![],
             has_log: false,
+            build_log_id: None,
         }
     }