Fix default lovelace yaml loading (#29240)

src/data/lovelace/resource.ts

@@ -1,6 +1,10 @@
 import type { Connection } from "home-assistant-js-websocket";
 import type { HomeAssistant } from "../../types";
 
+export interface LovelaceInfo {
+  resource_mode: "yaml" | "storage";
+}
+
 export interface LovelaceResource {
   id: string;
   type: "css" | "js" | "module" | "html";
@@ -42,3 +46,8 @@ export const deleteResource = (hass: HomeAssistant, id: string) =>
     type: "lovelace/resources/delete",
     resource_id: id,
   });
+
+export const fetchLovelaceInfo = (hass: HomeAssistant): Promise<LovelaceInfo> =>
+  hass.callWS({
+    type: "lovelace/info",
+  });

src/panels/config/lovelace/resources/ha-config-lovelace-resources.ts

@@ -13,10 +13,14 @@ import type {
 import "../../../../components/ha-card";
 import "../../../../components/ha-fab";
 import "../../../../components/ha-svg-icon";
-import type { LovelaceResource } from "../../../../data/lovelace/resource";
+import type {
+  LovelaceInfo,
+  LovelaceResource,
+} from "../../../../data/lovelace/resource";
 import {
   createResource,
   deleteResource,
+  fetchLovelaceInfo,
   fetchResources,
   updateResource,
 } from "../../../../data/lovelace/resource";
@@ -46,6 +50,8 @@ export class HaConfigLovelaceResources extends LitElement {
 
   @state() private _resources: LovelaceResource[] = [];
 
+  @state() private _lovelaceInfo?: LovelaceInfo;
+
   @state()
   @storage({
     storage: "sessionStorage",
@@ -197,15 +203,20 @@ export class HaConfigLovelaceResources extends LitElement {
 
   protected firstUpdated(changedProps: PropertyValues) {
     super.firstUpdated(changedProps);
-    this._getResources();
+    this._fetchData();
   }
 
-  private async _getResources() {
-    this._resources = await fetchResources(this.hass.connection);
+  private async _fetchData() {
+    const [resources, lovelaceInfo] = await Promise.all([
+      fetchResources(this.hass.connection),
+      fetchLovelaceInfo(this.hass),
+    ]);
+    this._resources = resources;
+    this._lovelaceInfo = lovelaceInfo;
   }
 
   private _editResource(ev: CustomEvent) {
-    if ((this.hass.panels.lovelace?.config as any)?.mode !== "storage") {
+    if (this._lovelaceInfo?.resource_mode !== "storage") {
       showAlertDialog(this, {
         text: this.hass!.localize(
           "ui.panel.config.lovelace.resources.cant_edit_yaml"
@@ -219,7 +230,7 @@ export class HaConfigLovelaceResources extends LitElement {
   }
 
   private _addResource() {
-    if ((this.hass.panels.lovelace?.config as any)?.mode !== "storage") {
+    if (this._lovelaceInfo?.resource_mode !== "storage") {
       showAlertDialog(this, {
         text: this.hass!.localize(
           "ui.panel.config.lovelace.resources.cant_edit_yaml"

src/panels/lovelace/ha-panel-lovelace.ts

@@ -368,13 +368,11 @@ export class LovelacePanel extends LitElement {
         this._ignoreNextUpdateEvent = true;
       }
 
-      // Keep lovelace yaml path for backward compatibility (until 2026.8)
-      const urlPath =
-        confMode === "yaml" && this.urlPath === "lovelace"
-          ? null
-          : this.urlPath;
-
-      confProm = fetchConfig(this.hass!.connection, urlPath, forceDiskRefresh);
+      confProm = fetchConfig(
+        this.hass!.connection,
+        this.urlPath,
+        forceDiskRefresh
+      );
     }
 
     try {

src/translations/en.json

@@ -4249,7 +4249,7 @@
             "confirm_delete_text": "{url} will be permanently deleted.",
             "refresh_header": "Do you want to refresh?",
             "refresh_body": "You have to refresh the page to complete the removal. Do you want to refresh now?",
-            "cant_edit_yaml": "You are using your dashboard in YAML mode, therefore you cannot manage your resources through the UI. Manage them in configuration.yaml.",
+            "cant_edit_yaml": "Your resources are in YAML mode, therefore you cannot manage them through the UI. Manage them in configuration.yaml.",
             "detail": {
               "new_resource": "Add new resource",
               "edit_resource": "Edit resource",