fix(build): validate storage availability when loading defaults

When loading var_container_storage / var_template_storage from default.vars
or app defaults, validate that the storage actually exists and is active on
the current node. In mixed clusters (e.g. LVM-Thin + ZFS hosts), saved
defaults from one node type would fail on another because the referenced
storage doesn't exist. Now invalid storage values are skipped with a
warning, allowing the normal storage selection prompt to appear.

Closes #12766

frontend/public/json/github-versions.json

@@ -1,5 +1,5 @@
 {
-  "generated": "2026-03-12T00:18:31Z",
+  "generated": "2026-03-12T06:19:33Z",
   "versions": [
     {
       "slug": "2fauth",
@@ -620,9 +620,9 @@
     {
       "slug": "jackett",
       "repo": "Jackett/Jackett",
-      "version": "v0.24.1341",
+      "version": "v0.24.1350",
       "pinned": false,
-      "date": "2026-03-11T05:55:00Z"
+      "date": "2026-03-12T06:03:33Z"
     },
     {
       "slug": "jellystat",
@@ -739,9 +739,9 @@
     {
       "slug": "leantime",
       "repo": "Leantime/leantime",
-      "version": "v3.7.1",
+      "version": "v3.7.3",
       "pinned": false,
-      "date": "2026-02-22T01:25:16Z"
+      "date": "2026-03-12T01:53:56Z"
     },
     {
       "slug": "librenms",

misc/build.func

@@ -1185,6 +1185,18 @@ load_vars_file() {
             continue
           fi
           ;;
+        var_container_storage | var_template_storage)
+          # Validate that the storage exists and is active on the current node
+          local _storage_status
+          _storage_status=$(pvesm status 2>/dev/null | awk -v s="$var_val" '$1 == s { print $3 }')
+          if [[ -z "$_storage_status" ]]; then
+            msg_warn "Storage '$var_val' from $file not found on this node, ignoring"
+            continue
+          elif [[ "$_storage_status" == "disabled" ]]; then
+            msg_warn "Storage '$var_val' from $file is disabled on this node, ignoring"
+            continue
+          fi
+          ;;
         esac
       fi