webui: surface confd inference in the advanced tree editor

confd infers Infix-suggested values (DHCP option lists, related leaves,
normalised values) into the candidate when a change is written, but the
tree editor's write handlers only wrote — SaveLeaf echoed the typed value
back, SaveGroup returned 204 — so the inferred values never appeared
until a manual page reload.

After a save (cfgSaved) re-fetch the current tree page from the now
up-to-date candidate and re-render it, so inference surfaces wherever it
landed on the page.  SaveLeaf now emits cfgSaved + 204 like SaveGroup
(its form uses hx-swap="none") instead of echoing the raw input.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

src/webui/internal/handlers/yang_tree.go

@@ -1227,17 +1227,17 @@ func (h *TreeHandler) SaveLeaf(w http.ResponseWriter, r *http.Request) {
 	}
 
 	body := map[string]any{qualName: coerceLeafValue(rawValue, node)}
-	data := &nodeDetailData{Node: node}
 
+	// Emit cfgSaved/cfgError like SaveGroup and let the client re-fetch the
+	// whole current page from the fresh candidate (so confd inference and
+	// normalisation surface) — don't echo the raw input back, which hid it.
 	if putErr := h.RC.Put(r.Context(), candidateDS+path, body); putErr != nil {
-		data.Error = putErr.Error()
-		data.CurrentValue = rawValue
-	} else {
-		data.SavedOK = true
-		data.CurrentValue = rawValue
+		w.Header().Set("HX-Trigger", `{"cfgError":"`+node.Name+": "+putErr.Error()+`"}`)
+		w.WriteHeader(http.StatusUnprocessableEntity)
+		return
 	}
-
-	h.FragTmpl.ExecuteTemplate(w, "yang-node-detail", data)
+	w.Header().Set("HX-Trigger", `{"cfgSaved":"Saved `+node.Name+` to candidate"}`)
+	w.WriteHeader(http.StatusNoContent)
 }
 
 // DeleteLeaf serves DELETE /configure/tree/node?path=...

src/webui/static/js/app.js

@@ -2121,6 +2121,22 @@ function renderCfgLog() {
         span.classList.remove('saved');
       }, 3000);
     }
+
+    // Re-render the whole current tree page from the (now fresh) candidate.
+    // The save handlers only WRITE — they don't echo back what confd
+    // inferred from the change (DHCP option lists, related leaves,
+    // normalised values), and inference can land outside the edited node.
+    // Re-fetching the page the user is on surfaces all of it.  Guarded on
+    // #yang-detail so curated pages that also emit cfgSaved are unaffected.
+    var detail = document.getElementById('yang-detail');
+    if (detail && window.htmx) {
+      var node = (history.state && history.state.yangDetailPath) ||
+                 new URLSearchParams(window.location.search).get('node');
+      if (node) {
+        htmx.ajax('GET', '/configure/tree/node?path=' + encodeURIComponent(node),
+          { target: '#yang-detail', swap: 'innerHTML' });
+      }
+    }
   });
 })();
 

src/webui/templates/fragments/yang-node-detail.html

@@ -21,10 +21,12 @@
 
   {{/* ── Edit form — only for writable leaves in non-ReadOnly mode ── */}}
   {{if and (not .ReadOnly) .Config (or (eq .Kind "leaf") (eq .Kind "leaf-list"))}}
+  {{/* hx-swap="none": SaveLeaf returns 204 + a cfgSaved trigger, and the
+       cfgSaved handler re-fetches the whole current tree page from the
+       fresh candidate so confd-inferred values surface. */}}
   <form class="yt-edit-form"
         hx-put="/configure/tree/node?path={{.Path | urlquery}}"
-        hx-target="#yang-detail"
-        hx-swap="innerHTML">
+        hx-swap="none">
     <div class="cfg-card-footer">
       <label class="yt-value-label">
         {{if .UsingDefault -}}