Promote shared BIM links through launcher

frontend/dcViewer.js

@@ -184,6 +184,7 @@ const AUTH_SESSION_API = "/api/auth/session";
 const SHARES_API = "/api/shares";
 const COMMENTS_API = "/api/comments";
 const UPLOAD_VERSIONS_API = "/api/uploads/versions";
+const SHARE_PROMOTION_TIMEOUT_MS = 4500;
 
 const acceptByType = {
   xkt: ".xkt",
@@ -620,6 +621,60 @@ const getShareTokenFromPath = () => {
   return match ? decodeURIComponent(match[1]) : null;
 };
 
+const getCurrentReturnPath = () => `${window.location.pathname}${window.location.search || ""}${window.location.hash || ""}`;
+
+const getShareTopLevelPromotionUrl = () => {
+  const promoteUrl = startupSharePayload?.promoteUrl;
+  return typeof promoteUrl === "string" && promoteUrl.trim() ? promoteUrl : "";
+};
+
+const scheduleShareSessionPromotion = (shareToken) => {
+  const silentPromoteUrl = startupSharePayload?.silentPromoteUrl;
+  if (!shareToken || viewerMode !== "guest" || runtimeSessionInfo.authenticated || typeof silentPromoteUrl !== "string" || !silentPromoteUrl.trim()) {
+    return;
+  }
+  let storageKey = "";
+  try {
+    storageKey = `bimdc-share-promote:${shareToken}`;
+    if (sessionStorage.getItem(storageKey)) {
+      return;
+    }
+    sessionStorage.setItem(storageKey, String(Date.now()));
+  } catch (_) {
+    storageKey = "";
+  }
+
+  const iframe = document.createElement("iframe");
+  iframe.title = "BIM share auth promotion";
+  iframe.tabIndex = -1;
+  iframe.setAttribute("aria-hidden", "true");
+  iframe.style.cssText = "position:fixed;width:1px;height:1px;left:-10000px;top:-10000px;border:0;opacity:0;pointer-events:none;";
+
+  let done = false;
+  let timeoutId = null;
+  const cleanup = () => {
+    window.removeEventListener("message", onMessage);
+    if (timeoutId) window.clearTimeout(timeoutId);
+    iframe.remove();
+  };
+  const onMessage = (event) => {
+    if (event.origin !== window.location.origin) return;
+    const payload = event.data || {};
+    if (payload.type !== "nodedc:bim-share-promoted") return;
+    done = true;
+    cleanup();
+    window.location.replace(payload.nextPath || getCurrentReturnPath());
+  };
+
+  window.addEventListener("message", onMessage);
+  timeoutId = window.setTimeout(() => {
+    if (done) return;
+    cleanup();
+  }, SHARE_PROMOTION_TIMEOUT_MS);
+  iframe.src = silentPromoteUrl;
+  document.body.appendChild(iframe);
+};
+
 const COMMENT_TARGET_ICON = `
   <svg viewBox="0 0 24 24" aria-hidden="true">
     <path d="M6.5 4.75h11A3.25 3.25 0 0 1 20.75 8v6.25a3.25 3.25 0 0 1-3.25 3.25h-5.26l-5.29 3.82V17.5H6.5a3.25 3.25 0 0 1-3.25-3.25V8A3.25 3.25 0 0 1 6.5 4.75Z"></path>
@@ -1794,6 +1849,9 @@ const initializeRuntimeMode = async () => {
   }
 
   applyRuntimeMode();
+  if (shareToken && viewerMode === "guest") {
+    scheduleShareSessionPromotion(shareToken);
+  }
 };
 
 const getShareableModelPayload = () => {
@@ -6525,7 +6583,8 @@ const loadProjectSnapshot = async (project) => {
   });
 
   homeButton.addEventListener("click", () => {
-    window.location.assign(getLauncherUrl());
+    const sharePromoteUrl = getShareTokenFromPath() && isGuestMode() ? getShareTopLevelPromotionUrl() : "";
+    window.location.assign(sharePromoteUrl || getLauncherUrl());
   });
 
   if (saveProjectButton) {

frontend/index.html

@@ -292,7 +292,7 @@
               <div class="inspector-select-host" id="displayModeSelect"></div>
             </div>
             <div class="inspector-control-row inspector-control-row--half hidden" id="customDisplayColorRow">
-              <div class="inspector-control-label">Цвет кастома</div>
+              <div class="inspector-control-label">Цвет</div>
               <div class="inspector-color-host" id="customDisplayColorControl"></div>
             </div>
             <div class="inspector-control-row inspector-control-row--half" id="lightingModeControl">