diff --git a/.beads/issues.jsonl b/.beads/issues.jsonl
index b6b9517..ff0fe3b 100644
--- a/.beads/issues.jsonl
+++ b/.beads/issues.jsonl
@@ -104,5 +104,5 @@
 {"id":"ifcurl-vam","title":"Phase 6: Bonsai offer ifc:// URL when saving linked model reference","description":"When saving an IFCDOCUMENTREFERENCE in Bonsai, offer the option to write the location as an ifc:// URL rather than a relative path. When a relative path would traverse above the repository root, prompt the user to convert it to an ifc:// URL. Requires Phase 4 federation (ifcurl-bqt).","status":"deferred","priority":4,"issue_type":"feature","owner":"bruno@postle.net","created_at":"2026-04-23T05:49:16Z","created_by":"Bruno Postle","updated_at":"2026-04-23T06:15:13Z","defer_until":"2026-12-01T00:00:00Z","dependencies":[{"issue_id":"ifcurl-vam","depends_on_id":"ifcurl-bqt","type":"blocks","created_at":"2026-04-23T06:49:23Z","created_by":"Bruno Postle","metadata":"{}"}],"dependency_count":1,"dependent_count":0,"comment_count":0}
 {"id":"ifcurl-9k2","title":"Phase 5: IFC Viewer integration (equivalent of Phase 4)","description":"Add ifc:// OS protocol handler and 'Copy view URL' button to the IFC Viewer desktop application, equivalent to the Bonsai Phase 4 integration. Depends on Phase 4 being complete as a reference implementation.","status":"deferred","priority":4,"issue_type":"feature","owner":"bruno@postle.net","created_at":"2026-04-23T05:49:08Z","created_by":"Bruno Postle","updated_at":"2026-04-23T06:15:12Z","defer_until":"2026-12-01T00:00:00Z","dependencies":[{"issue_id":"ifcurl-9k2","depends_on_id":"ifcurl-0oj","type":"blocks","created_at":"2026-04-23T06:49:14Z","created_by":"Bruno Postle","metadata":"{}"}],"dependency_count":1,"dependent_count":0,"comment_count":0}
 {"id":"ifcurl-prc","title":"Phase 3c: 3D diff view for IFC PR merges","description":"After a PR merge completes, surface a 'View merge in 3D' button using the Phase 3b viewer. Use @thatopen/components highlighter to colour added, removed, and modified elements differently, driven by comparing the merged IFC against either parent. Requires Phase 3b viewer (ifcurl-i1s) to be working.","status":"closed","priority":4,"issue_type":"feature","owner":"bruno@postle.net","created_at":"2026-04-23T05:48:30Z","created_by":"Bruno Postle","updated_at":"2026-04-26T17:15:07Z","closed_at":"2026-04-26T17:15:07Z","close_reason":"Rendered diff already implemented in footer.tmpl Case 3; static PNG via /render_diff endpoint, not interactive 3D","dependencies":[{"issue_id":"ifcurl-prc","depends_on_id":"ifcurl-i1s","type":"blocks","created_at":"2026-04-23T06:48:36Z","created_by":"Bruno Postle","metadata":"{}"}],"dependency_count":1,"dependent_count":0,"comment_count":0}
-{"_type":"memory","key":"forgejo-build-and-deploy-procedure-go-build-c","value":"Forgejo build and deploy procedure: go build -C /home/bruno/src/forgejo -tags 'sqlite sqlite_unlock_notify' -ldflags \"-X 'forgejo.org/modules/setting.StaticRootPath=/usr/share/forgejo'\" -o /home/bruno/src/forgejo/forgejo . — then sudo cp forgejo /usr/bin/forgejo. StaticRootPath=/usr/share/forgejo. CustomPath=/var/lib/forgejo/custom. Custom templates go to /var/lib/forgejo/custom/templates/custom/ (e.g. footer.tmpl → /var/lib/forgejo/custom/templates/custom/footer.tmpl). Custom static files go to /var/lib/forgejo/custom/public/assets/ (NOT /etc/forgejo/public/assets/) and are served at /assets/*."}
 {"_type":"memory","key":"torawurl-in-viewer-url-js-must-support-github","value":"toRawUrl in viewer-url.js must support GitHub, GitLab, Forgejo/Gitea (codeberg.org, self-hosted), and localhost. Tests in forgejo/tests/viewer-url.test.js cover all four. The localhost check (http vs https) is based on host.startsWith('localhost'), so subdomain.localhost gets https."}
+{"_type":"memory","key":"forgejo-build-and-deploy-procedure-go-build-c","value":"Forgejo build and deploy procedure: go build -C /home/bruno/src/forgejo -tags 'sqlite sqlite_unlock_notify' -ldflags \"-X 'forgejo.org/modules/setting.StaticRootPath=/usr/share/forgejo'\" -o /home/bruno/src/forgejo/forgejo . — then sudo cp forgejo /usr/bin/forgejo. StaticRootPath=/usr/share/forgejo. CustomPath=/var/lib/forgejo/custom. Custom templates go to /var/lib/forgejo/custom/templates/custom/ (e.g. footer.tmpl → /var/lib/forgejo/custom/templates/custom/footer.tmpl). Custom static files go to /var/lib/forgejo/custom/public/assets/ (NOT /etc/forgejo/public/assets/) and are served at /assets/*."}
diff --git a/forgejo/custom/public/assets/ifcurl.js b/forgejo/custom/public/assets/ifcurl.js
index b95e9f5..2c2277f 100644
--- a/forgejo/custom/public/assets/ifcurl.js
+++ b/forgejo/custom/public/assets/ifcurl.js
@@ -69,10 +69,13 @@ function init() {
   // -----------------------------------------------------------------------
   const btnGroup = document.querySelector(".file-header-right .ui.buttons");
   if (btnGroup) {
-    // Permalink href or current URL when already at a commit.
-    const a = document.querySelector('a[href*="/src/commit/"]');
-    const href = a ? a.getAttribute("href") : window.location.pathname;
-    const info = parseCommitHref(href);
+    // If already at a commit URL use the pathname directly; otherwise find
+    // the Permalink anchor (present on branch/tag file views).
+    let info = parseCommitHref(window.location.pathname);
+    if (!info) {
+      const a = document.querySelector('a[href*="/src/commit/"]');
+      if (a) info = parseCommitHref(a.getAttribute("href"));
+    }
     if (info && info.treePath.toLowerCase().endsWith(".ifc")) {
       btnGroup.appendChild(makeViewerLink(info, "View in 3D"));
     }
diff --git a/forgejo/tests/viewer-util.test.js b/forgejo/tests/viewer-util.test.js
index f8572aa..91750bd 100644
--- a/forgejo/tests/viewer-util.test.js
+++ b/forgejo/tests/viewer-util.test.js
@@ -29,6 +29,16 @@ describe("parseCommitHref", () => {
     assert.equal(parseCommitHref(""), null);
   });
 
+  test("returns null for a commit directory link (no file path)", () => {
+    // Breadcrumb anchors on a file-view page link to the directory at the
+    // commit, e.g. /org/repo/src/commit/{hash} with no trailing file path.
+    // These must not be mistaken for a file permalink.
+    assert.equal(
+      parseCommitHref("/org/repo/src/commit/a1b2c3d4e5f6a1b2c3d4e5f6a1b2c3d4e5f6a1b2"),
+      null
+    );
+  });
+
   test("returns null if hash is not 40 hex chars", () => {
     assert.equal(parseCommitHref("/org/repo/src/commit/abc123/model.ifc"), null);
   });