Cookbook polish: auto-reconnect, ctx slider fixes, scoring, lots of UI

Backend (services/hwfit + routes):
- VRAM column sort now shows global highest first (was special-cased to
  ascending then truncated top-N, which made "highest VRAM" mathematically
  unreachable). Every column path uses reverse=True for the truncation.
- Hardware probe cache TTL 30min -> 24h so changing filters doesn't keep
  re-probing the rig during a session; Rescan button still forces fresh.
- Multi-GPU rigs filter GGUF Q*/IQ quants (vLLM/SGLang can't serve them);
  default non-prequantized to BF16 on 2+ GPUs.
- AWQ / AWQ-8bit / GPTQ-8bit get a -1.0 quality penalty so FP8 wins ties.
- Version-aware tiebreaker (parse Mn.n / Vn) — MiniMax-M2.7 ranks above M2.5.
- hf_models.json: zai-org/GLM-5.1 added; zai-org/GLM-5 quantization flipped
  Q4_K_M -> BF16. DeepSeek-V4-Flash / -Pro + their -Base variants registered
  with new FP4-MoE-Mixed / FP8-Mixed quant keys (calibrated BPP from the
  actual 156 GB / 284 GB disk footprints).
- New FP4-MoE-Mixed + FP8-Mixed entries in QUANT_BPP / QUANT_SPEED_MULT /
  QUANT_QUALITY_PENALTY / QUANT_BYTES_PER_PARAM / PREQUANTIZED_PREFIXES.

Frontend — Scan/Download:
- Engine + Quant swapped in the toolbar; Quant defaults to "All".
- Ctx (range slider) ported from origin/main: 8k/16k/32k/50k/128k/Max. Drag
  re-sorts by vram ascending (smallest fitting first); back to Max → score.
- Ctx slider rail now visible — was background:transparent in a duplicate
  later-cascade rule. Hardcoded grey + !important.
- Search input moved to the far right of the toolbar.
- Type/Standard default; "Context" not uppercased; Search placeholder dimmed.
- Engine "?" + Quant "?" inline help chips inside their dropdown boxes.
- Fit-column dot toggles fit-only filter; un-toggling re-sorts by VRAM desc.
- Quant column truncates to 9 chars + ellipsis ("FP4-MoE-M..."), full in
  tooltip. Smart title-suffix strips the parts already in the repo name
  (QuantTrio/MiniMax-M2-AWQ + quant AWQ-4bit -> just "(4bit)").
- Conditional warning for safetensors models on non-GPU rigs only.
- Dependency Install / Installed / Installed▾ / N/A all 75.85px wide.
- Rebuild llama.cpp moved into the llama_cpp dep row, styled as a tag.
- Foldable Download admin-card (h2 chevron); line under h2 only when folded.
- HF token save gets a green ✓ + "Saved" flash.
- Cached scan no longer counts stalled rows as downloaded.
- Footer: "Request it →" link with GitHub mark to the public discussion
  (#1962) for model-add requests.

Frontend — Running tab:
- Strict download-finish check (DOWNLOAD_OK or /snapshots/, not bare
  "Download complete"). True overall % for multi-shard downloads:
  ((N-1)+frac)/total instead of hf_transfer's per-shard aggregate.
- ETA in the uptime ticker: "downloading: 12m 34s · ETA 1h 23m".
- Clear button kills the tmux session too; if the output still shows a
  live shard line, the pill is hidden + relabels as "reconnect" + revives
  on click.
- Self-heal: on cookbook open AND every bg-monitor cycle (10s, throttled
  to 8s), scan persisted done/error/crashed downloads and probe their
  tmux session — if alive, flip status back to running and reattach.
- Per-launch zombie probe: clicking Download on a model whose persisted
  state is done but tmux is still alive revives the existing task and
  refuses to start a duplicate.
- Pre-launch GPU probe: vllm / sglang / diffusers serve check
  /api/cookbook/gpus first; warns + confirms if no GPU is visible.
- Server-side state guard: rejects "done" POSTs for downloads lacking
  DOWNLOAD_OK / DOWNLOAD_FAILED / /snapshots/ when the last-mentioned
  shard is N<total — stale tabs can't poison persisted state any more.
- Running count includes tasks whose output looks active even if persisted
  status got stuck. Dir text on the running row, font matched to uptime.

Serve panel:
- Ctx text input always resets to model max on open (default 20000 when
  metadata is missing).
- Max Seqs default 8 -> 4. KV Cache dtype select 32px tall.
- Lightning icon on Launch (same as Action toggle).
- Diagnosis card simplified (no fold/copy/dismiss), suggestion font
  matches body; action buttons get icons on the left (Retry/Copy/Edit/
  Install/Kill/Switch/etc.).
- Incomplete-download serve warning when model status is
  downloading / stalled / has_incomplete.
- MTP "?" tooltip ("supported on a few model families … up to ~3× faster").

static/js/cookbookDownload.js

@@ -535,6 +535,42 @@ export async function _runModelDownload(panel, model, backend, hostOverride) {
     uiModule.showToast(`${shortName} is already ${duplicate.status === 'queued' ? 'queued' : 'downloading'}`);
     return;
   }
+  // Also catch zombie "done" tasks — the cookbook may have lost track of a
+  // download (server restart, stale state) while its tmux session is still
+  // alive on the host. Probe it; if alive, flip back to running + treat as
+  // duplicate so we don't kick off a second concurrent download writing to
+  // the same target dir.
+  const zombieCandidate = tasks.find(t => sameDownload(t)
+    && ['done', 'error', 'crashed', 'stopped'].includes(t.status)
+    && t.sessionId && !String(t.sessionId).startsWith('queue-'));
+  if (zombieCandidate) {
+    try {
+      const _zh = zombieCandidate.remoteHost || '';
+      const _zPort = (_envState.servers || []).find(s => s.host === _zh)?.port;
+      const _sshPf = _zh ? `ssh ${_zPort && _zPort !== '22' ? `-p ${_zPort} ` : ''}${_zh} '` : '';
+      const _sshSf = _zh ? `'` : '';
+      const _probeCmd = `${_sshPf}tmux has-session -t ${zombieCandidate.sessionId} 2>/dev/null${_sshSf}`;
+      const _r = await fetch('/api/shell/exec', {
+        method: 'POST', credentials: 'same-origin',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ command: _probeCmd, timeout: 5 }),
+      });
+      const _d = await _r.json();
+      if (_d.exit_code === 0) {
+        // tmux still alive → not actually done. Revive + tell the user.
+        const _fresh = _loadTasks();
+        const _ft = _fresh.find(t => t.sessionId === zombieCandidate.sessionId);
+        if (_ft) {
+          _ft.status = 'running';
+          _ft._selfHealed = true;
+          _saveTasks(_fresh);
+        }
+        _renderRunningTab();
+        uiModule.showToast(`${shortName} is still downloading (was marked finished after a restart — revived)`);
+        return;
+      }
+    } catch { /* probe failed — fall through and let the user launch */ }
+  }
   const activeOnHost = tasks.find(t => t.type === 'download' && (t.status === 'running' || t.status === 'queued') && (t.remoteHost || 'local') === targetHost);
 
   if (activeOnHost) {