fix: Forge iframe height uses 82vh (bypasses flex parent issue)

height:100% doesn't work when parent uses flex height. position:absolute collapses the parent. 82vh = 90vh modal - header. Also set bodyEl overflow:hidden.

frontend/app.js

@@ -3302,7 +3302,7 @@
       var iframe = document.createElement("iframe");
       iframe.id = "forge-iframe";
       iframe.src = "/editor-poc?vault=" + encodeURIComponent(data.vault) + "&path=" + encodeURIComponent(data.path);
-      iframe.style.cssText = "position:absolute;top:0;left:0;width:100%;height:100%;border:none;";
+      iframe.style.cssText = "width:100%;height:82vh;border:none;display:block;";
       bodyEl.appendChild(iframe);
       modal.classList.add("active");
       safeCreateIcons();

frontend/js/viewer.js

@@ -504,10 +504,11 @@ export function renderFile(data) {
     var bodyEl = document.getElementById("editor-body");
     titleEl.textContent = "Forge: " + data.path.split("/").pop();
     bodyEl.innerHTML = "";
+    bodyEl.style.overflow = "hidden";
     var iframe = document.createElement("iframe");
     iframe.id = "forge-iframe";
     iframe.src = "/editor-poc?vault=" + encodeURIComponent(data.vault) + "&path=" + encodeURIComponent(data.path);
-    iframe.style.cssText = "position:absolute;top:0;left:0;width:100%;height:100%;border:none;";
+    iframe.style.cssText = "width:100%;height:82vh;border:none;display:block;";
     bodyEl.appendChild(iframe);
     modal.classList.add("active");
     safeCreateIcons();