Cookbook UI: Ollama browser, advanced serve fold, API tokens form, diagnosis toolbar, polish

Surface a lot of accumulated cookbook + UI work as a single non-agent
commit so the agent rework lands cleanly.

Highlights:
- Ollama as a first-class backend in the Cookbook:
  * Download input accepts ollama-style names (name:tag) → backend=ollama
  * /api/cookbook/ollama/library (cached scrape of ollama.com + curated
    fallback so classic models like qwen2.5 stay reachable)
  * "Browse Ollama library" toggle below Download with size chips
  * Engine=Ollama in hwfit toolbar merges the Ollama library into the
    main scan list as per-tag rows with the same Fit/Param/Quant/VRAM
    columns; click → fills Download input
- API Tokens form added to Integrations panel (matching wired
  loadTokens()/initTokenForm() that had no HTML)
- Serve panel polish: Advanced fold tightening (-8px nudges on vLLM
  checks, Extra args, Spec row), n_cpu_moe + Split Mode controls
  pulled up 8px to align with the row's checkboxes, GGUF File dropdown
  exposed for Ollama backend, GPU re-render on Edit serve restore,
  _forceBackend flag so saved serveState wins over backend detection,
  cookbook:servers-changed CustomEvent so panels don't need refresh
- Models page redesign: Add Models row (URL + hidden API key reveal +
  Type select + Scan/Ollama/Key/Test/Add icon buttons), Probe All +
  Clear-offline buttons in Added Models toolbar, offline-pill removed
  (opacity already conveys state), Engine dropdown gains Ollama option
- _ping_endpoint probes /v1/models then base, accepts 4xx as
  reachable (vLLM returns 404 on bare /v1, fully working endpoints
  were showing offline)
- Diagnosis card: × dismiss + Copy bundle buttons restored on the
  serve error feedback card
- Orphan tmux sweep re-enabled behind a 60s rate-limit + background
  Thread (off the main event loop) so dead serves get discovered
- cookbook_routes auto-register watchdog: drops the endpoint if the
  serve session exits non-zero within the first ~3min
- ollama-rocm sidecar awareness in download wrapper (`docker exec
  ollama-rocm ollama pull` when host ollama isn't installed)
- Skill extractor sets initial_status="published" when
  auto_approve_skills pref is on (audit demotes later)
- Skill list / model list / cookbook scan misc polish

static/js/documentLibrary.js

@@ -578,13 +578,12 @@ let _libraryArchivedView = false;   // Documents tab showing archived docs?
     const pieces = [];
     if (doc.session_name) pieces.push(`<span>${_esc(doc.session_name)}</span>`);
     if (doc.language && doc.language !== 'text') {
-      const ic = langIcon(doc.language, 11, { style: 'vertical-align:-2px;flex-shrink:0;opacity:0.65;color:currentColor;' });
-      pieces.push(`<span style="display:inline-flex;align-items:center;gap:3px;">${ic}${_esc(doc.language)}</span>`);
+      // Per-language icon lives in the title row above; just the language
+      // name here keeps the meta line scannable without duplicating the icon.
+      pieces.push(`<span>${_esc(doc.language)}</span>`);
     }
     pieces.push(`<span>${_esc(libraryRelativeTime(doc.updated_at))}</span>`);
     meta.innerHTML = pieces.join('<span style="opacity:0.5;">\u00b7</span>');
-    // Strip the per-language icon from the meta line \u2014 it now sits next to the
-    // title above, so duplicating it here was redundant.
     content.appendChild(meta);
     card.appendChild(content);