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/cookbookRunning.js

@@ -1564,6 +1564,10 @@ export async function _launchServeTask(shortName, repo, cmd, fields, hostOverrid
     const payload = { repo_id: repo, remote_host: _host || undefined, ssh_port: _sp || undefined, _cmd: cmd, _fields: fields || undefined, _env: _usedEnv, _envPath: _usedEnvPath, _gpus: _usedGpus };
     _addTask(data.session_id, shortName, 'serve', payload);
     uiModule.showToast(`Serving ${shortName}...`);
+    // Auto-register may have enabled an existing (offline) endpoint for this
+    // host:port. Refresh the picker so the row is no longer dimmed, and the
+    // user doesn't see "offline" on a serve they just started.
+    try { _refreshModelsAfterEndpointChange(); } catch (_) {}
   } catch (e) {
     uiModule.showToast('Failed: ' + e.message);
   }
@@ -3032,6 +3036,11 @@ async function _reconnectTask(el, task) {
             if (info.status === 'ready' && !task._serveReady) {
               task._serveReady = true;
               _updateTask(task.sessionId, { _serveReady: true });
+              // The auto-registered endpoint was marked offline while the
+              // server was coming up. Now that it's reachable, nudge the
+              // picker to re-probe so the offline pill clears without the
+              // user having to reopen Settings or refresh the page.
+              try { _refreshModelsAfterEndpointChange(); } catch (_) {}
             }
             if (info.phase) {
               badge.textContent = info.phase;