Resolve doc cross-links by real filename as a fallback

The new concept docs (and their "See also" reciprocal links) reference
each other by real filename -- "concepts-accounts.html" -- which is the
correct, working URL on the Jekyll/GitHub Pages build (a page's URL there
IS its filename stem), but doesn't match this viewer's own short slugs
(DOCS keys, e.g. "accounts" -> /docs/accounts), so fixDocLinks() left
those links unrewritten and 404ing in-app.

Rather than rewrite the docs to two different link forms depending on
target, resolve by filename as a fallback when the slug lookup misses --
one link written in a doc now works correctly on both targets.

Bumps to v1.1.13.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KDEx8ghuZR61pqPXc6da9C

nodejs/package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "t42-sso-manager",
-  "version": "1.1.12",
+  "version": "1.1.13",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "t42-sso-manager",
-      "version": "1.1.12",
+      "version": "1.1.13",
       "license": "MIT",
       "dependencies": {
         "@fortawesome/fontawesome-free": "^7.3.0",

nodejs/package.json

@@ -1,6 +1,6 @@
 {
   "name": "t42-sso-manager",
-  "version": "1.1.12",
+  "version": "1.1.13",
   "private": true,
   "author": [
     {

nodejs/routes/docs.js

@@ -60,10 +60,22 @@ function fixImagePaths(html) {
 // at /docs/<slug> with no .html suffix. Rewrite known doc links to the
 // in-app route, same idea as fixImagePaths() above. Only touches slugs that
 // actually exist, so an unrelated "foo.html" link is left alone.
+// Docs are also linked by their real filename stem (e.g. "concepts-accounts.html"
+// for docs/concepts-accounts.md) -- the correct, working link on the Jekyll/
+// GitHub Pages build, where the URL IS the filename stem. That doesn't match
+// this viewer's own short slugs (DOCS keys, e.g. "accounts"), so also resolve
+// by filename as a fallback -- one link written in a doc works correctly on
+// both targets, rather than needing two different link forms.
+const slugByFilename = Object.fromEntries(
+	Object.entries(DOCS).map(([slug, d]) => [path.basename(d.file, '.md'), slug])
+);
 function fixDocLinks(html) {
 	return html
 		.replace(/href="index\.html"/g, 'href="/docs"')
-		.replace(/href="([a-z0-9-]+)\.html"/g, (match, slug) => DOCS[slug] ? `href="/docs/${slug}"` : match);
+		.replace(/href="([a-z0-9-]+)\.html"/g, (match, name) => {
+			const slug = DOCS[name] ? name : slugByFilename[name];
+			return slug ? `href="/docs/${slug}"` : match;
+		});
 }
 
 // docs/*.md files (not the repo-root README/CHANGELOG/API.md) carry Jekyll