Add HTML/RevealJS preview alongside existing PDF preview

clsi-nginx.conf: the types{} block was overriding all nginx defaults,
  leaving HTML/CSS/JS/fonts as application/octet-stream. Add the full
  set of web MIME types so RevealJS assets are served correctly. Also
  needed for X-Content-Type-Options: nosniff to pass.

CompileController.js: success was hardcoded to require output.pdf.
  Also accept output.html so a RevealJS compile is reported as
  'success' rather than 'failure'.

QuartoRunner.js: remove hardcoded --to typst --output output.pdf.
  Instead run `quarto render` without --to/--output so the YAML
  frontmatter decides the format (typst → PDF, revealjs → HTML, etc.).
  Pass --embed-resources so HTML output is self-contained (flag is
  silently ignored by the typst backend). After render, rename
  main.pdf → output.pdf or main.html → output.html so the pipeline
  finds the standard canonical filename.

output-files.ts: handleOutputFiles now falls back to output.html when
  output.pdf is absent. Download URL uses outputFile.path instead of
  the hardcoded 'output.pdf' string.

pdf-viewer.tsx: when pdfUrl contains output.html, bypass PDF.js
  entirely and render a sandboxed iframe (allow-scripts for RevealJS
  interactivity, allow-presentation for fullscreen).

Usage: set `format: revealjs` in the .qmd YAML frontmatter to get
  an HTML presentation preview; set `format: typst` for PDF.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

server-ce/nginx/clsi-nginx.conf

@@ -25,8 +25,19 @@ server {
   gzip_types text/plain;
   gzip_proxied any;
   types {
-      text/plain log blg aux stdout stderr;
-      application/pdf pdf;
+      text/html                  html htm;
+      text/css                   css;
+      application/javascript     js;
+      application/json           json;
+      image/svg+xml              svg svgz;
+      image/png                  png;
+      image/jpeg                 jpeg jpg;
+      image/gif                  gif;
+      image/webp                 webp;
+      font/woff                  woff;
+      font/woff2                 woff2;
+      application/pdf            pdf;
+      text/plain                 log blg aux stdout stderr txt;
   }
   # handle output files for specific users
   location ~ ^/project/([0-9a-f]+)/user/([0-9a-f]+)/build/([0-9a-f-]+)/output/(.+)$ {