DEV: Remove the legacy widget code (#94)

Remove deprecated discourse.post-stream-widget-overrides and associated legacy widget customizations.

This cleanup reduces technical debt, ensures future maintainability, and aligns with the latest framework improvements.

.discourse-compatibility

@@ -1,3 +1,4 @@
+< 2025.12.0-latest: a8a305227da023ff1ce7ac4d702fc2204d9b5e2f
 < 3.6.0.beta1-dev: 7d6b0623ec27e986182b2e245bfaf886b7faecb1
 < 3.5.0.beta8-dev: c0d69bd03fb2ec0c0169965464d5ba138ad28414
 < 3.5.0.beta5-dev: 9834dba01aff6644bd2fb9d1ed700854394a4bdf

assets/javascripts/discourse/initializers/extend-for-signatures.js

@@ -1,58 +1,11 @@
 import { action } from "@ember/object";
-import { isEmpty } from "@ember/utils";
-import { withSilencedDeprecations } from "discourse/lib/deprecated";
 import { withPluginApi } from "discourse/lib/plugin-api";
-import RawHtml from "discourse/widgets/raw-html";
 import PostSignature from "../components/post-signature";
 
-function customizePost(api, siteSettings) {
+function customizePost(api) {
   api.addTrackedPostProperties("user_signature");
 
   api.renderAfterWrapperOutlet("post-content-cooked-html", PostSignature);
-
-  withSilencedDeprecations("discourse.post-stream-widget-overrides", () =>
-    customizeWidgetPost(api, siteSettings)
-  );
-}
-
-function customizeWidgetPost(api, siteSettings) {
-  api.decorateWidget("post-contents:after-cooked", (dec) => {
-    const attrs = dec.attrs;
-    if (isEmpty(attrs.user_signature)) {
-      return;
-    }
-
-    const currentUser = api.getCurrentUser();
-    let enabled;
-
-    if (currentUser) {
-      enabled =
-        currentUser.get("custom_fields.see_signatures") ??
-        siteSettings.signatures_visible_by_default;
-    } else {
-      enabled = siteSettings.signatures_visible_by_default;
-    }
-    if (enabled) {
-      if (siteSettings.signatures_advanced_mode) {
-        return [
-          dec.h("hr"),
-          dec.h(
-            "div",
-            new RawHtml({
-              html: `<div class='user-signature'>${attrs.user_signature}</div>`,
-            })
-          ),
-        ];
-      } else {
-        return [
-          dec.h("hr"),
-          dec.h("img.signature-img", {
-            attributes: { src: attrs.user_signature },
-          }),
-        ];
-      }
-    }
-  });
 }
 
 function addSetting(api) {
@@ -79,8 +32,8 @@ export default {
     const siteSettings = container.lookup("service:site-settings");
     if (siteSettings.signatures_enabled) {
       withPluginApi((api) => {
-        customizePost(api, siteSettings);
-        addSetting(api, siteSettings);
+        customizePost(api);
+        addSetting(api);
       });
     }
   },