Cookbook: clearer tooltips on saved-config badge and GPU chip (#850)

Two small polish items in the Cookbook Serve panel.

Saved-config badge
The little count badge next to the Save button ("3 ▾" etc.) had a
generic "Saved launch configs" tooltip, so the number reads like a
notification dot. Make it spell out what it is and what clicking does:
"3 saved launch configs for <model> — click ▾ to load or delete"
(and "No saved launch configs for <model> yet — click Save to add
one" when empty). Tooltip stays in sync via _updateSavedToggleLabel
so save/delete updates both the count and the hint.

GPU chip on mixed-GPU boxes (#711)
The chip label was `${gpuCount}x ${gpu_name}`, where gpu_name is
just gpus[0].name — so a 4090 + 3060 reads as "2x RTX 4090". The
backend already emits gpu_groups (identical cards grouped, used by
the serve flow to pin CUDA_VISIBLE_DEVICES) and a per-card gpus[]
array, so use them:

- Label renders each homogeneous pool: "1× RTX 4090 + 1× RTX 3060".
  Homogeneous setups keep the existing "2× RTX 4090" form.
- Tooltip lists each GPU with its index + VRAM, useful for picking
  the right device when launching.

Refs #711.

static/js/cookbook-hwfit.js

@@ -576,8 +576,36 @@ export function _hwfitRenderHw(el, sys) {
   };
   let gpuChip;
   if (sys.gpu_name) {
-    const label = gpuCount > 1 ? `${gpuCount}x ${esc(sys.gpu_name)}` : esc(sys.gpu_name);
-    gpuChip = chip('gpu', label);
+    // Mixed-GPU boxes (#711): `${gpuCount}x ${gpu_name}` uses gpus[0].name for
+    // every card, so a 4090+3060 reads as "2x RTX 4090". Use gpu_groups (the
+    // backend already groups identical cards) to render each pool separately
+    // and put the per-card index+VRAM into the tooltip so it's actually
+    // useful for picking CUDA_VISIBLE_DEVICES.
+    const groups = Array.isArray(sys.gpu_groups) ? sys.gpu_groups : [];
+    // Shorten vendor prefixes so a mixed-GPU label fits in the chip row
+    // without overflowing. Single-GPU label still shows the full name
+    // (that's what users are used to seeing). Tooltip carries the full
+    // unmodified names regardless, so no information is lost.
+    const _shortGpuName = (n) => String(n || '')
+      .replace(/^NVIDIA\s+GeForce\s+/i, '')
+      .replace(/^NVIDIA\s+/i, '')
+      .replace(/^AMD\s+Radeon\s+/i, '')
+      .replace(/^AMD\s+/i, '')
+      .replace(/^Intel\s+/i, '');
+    let label;
+    if (groups.length > 1) {
+      // Heterogeneous: "1× RTX 4090 + 1× RTX 3060"
+      label = groups.map(g => `${g.count}× ${esc(_shortGpuName(g.name))}`).join(' + ');
+    } else if (gpuCount > 1) {
+      label = `${gpuCount}× ${esc(sys.gpu_name)}`;
+    } else {
+      label = esc(sys.gpu_name);
+    }
+    const gpus = Array.isArray(sys.gpus) ? sys.gpus : [];
+    const tip = gpus.length
+      ? gpus.map(g => `GPU ${g.index}: ${g.name} · ${(+g.vram_gb).toFixed(1)} GB`).join('\n')
+      : 'Click to toggle off (X to hide)';
+    gpuChip = chip('gpu', label, tip);
   } else if (sys.gpu_error) {
     gpuChip = _removedHwChips.has('gpu')
       ? ''

static/js/cookbookServe.js

@@ -413,10 +413,16 @@ function _rerenderCachedModels() {
       // load, × to delete) plus a "Save current config" row — see _showSavedConfigMenu.
       // Split button: "Save" saves the current config directly; the arrow opens
       // the dropdown of saved configs (load / delete). Arrow shows the count.
+      // The arrow button shows just the saved-config count next to a "▾".
+      // Spell out what the number means in the tooltip so users don't have
+      // to click it to find out the badge isn't a notification dot.
       const _arrowLabel = _modelPresets.length > 0 ? `${_modelPresets.length} ▾` : '▾';
+      const _arrowTitle = _modelPresets.length > 0
+        ? `${_modelPresets.length} saved launch config${_modelPresets.length === 1 ? '' : 's'} for ${_repoShort} — click ▾ to load or delete`
+        : `No saved launch configs for ${_repoShort} yet — click Save to add one`;
       let _slotsHtml = `<div class="cookbook-serve-slots cookbook-saved-split">`
         + `<button type="button" class="cookbook-slot-btn cookbook-saved-save" title="Save current config"><svg width="11" height="11" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M19 21H5a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h11l5 5v11a2 2 0 0 1-2 2z"/><polyline points="17 21 17 13 7 13 7 21"/><polyline points="7 3 7 8 15 8"/></svg>Save</button>`
-        + `<button type="button" class="cookbook-slot-btn cookbook-saved-arrow" title="Saved launch configs">${_arrowLabel}</button>`
+        + `<button type="button" class="cookbook-slot-btn cookbook-saved-arrow" title="${esc(_arrowTitle)}">${_arrowLabel}</button>`
         + `</div>`;
 
       let panelHtml = `<div class="hwfit-serve-panel">${_slotsHtml}`;
@@ -663,11 +669,15 @@ function _rerenderCachedModels() {
         panel.querySelector(`.cookbook-slot-btn[data-slot="${slotIdx}"]`)?.classList.add('active');
       }
 
-      // Keep the arrow button's count in sync with the stored presets.
+      // Keep the arrow button's count + tooltip in sync with stored presets.
       function _updateSavedToggleLabel() {
         const n = _presetsForModel(_loadPresets(), repo).length;
         const t = panel.querySelector('.cookbook-saved-arrow');
-        if (t) t.textContent = n > 0 ? `${n} ▾` : '▾';
+        if (!t) return;
+        t.textContent = n > 0 ? `${n} ▾` : '▾';
+        t.title = n > 0
+          ? `${n} saved launch config${n === 1 ? '' : 's'} for ${_repoShort} — click ▾ to load or delete`
+          : `No saved launch configs for ${_repoShort} yet — click Save to add one`;
       }
 
       // Save the current panel fields as a new named preset (shared by the menu's