fix(ams): surface active K-profile when no slot preset is resolvable (#1689 follow-up)

Configure Slot dropped to "default 0.020" on reopen for slots that were
  physically loaded but unconfigured (tray_type="", no slot_preset_mappings
  row). The #1689 cali_idx safety net was unreachable from that path —
  matchingKProfiles early-returned [] on !selectedPresetInfo before the
  safety net ran.

  Split the early return so the cali_idx fallback survives the no-preset
  case: when selectedPresetInfo is null but slotInfo.caliIdx > 0, return
  the active profile as a single-item list (extruder-matched when known).
  Strictly additive; caliIdx == 0/null still returns [], existing matcher
  unchanged when a preset is resolvable.

frontend/src/__tests__/components/ConfigureAmsSlotModal.test.tsx

@@ -497,6 +497,45 @@ describe('ConfigureAmsSlotModal', () => {
     });
   });
 
+  it("surfaces the slot's active K-profile when no preset is resolvable (#1689 follow-up)", async () => {
+    // Repro from Spionkiller01: slot is physically loaded but unconfigured —
+    // tray_type='', tray_info_idx='', no slot_preset_mappings row — so
+    // selectedPresetInfo resolves to null. Before the patch the main matcher's
+    // early return on !selectedPresetInfo skipped past the cali_idx safety net
+    // entirely; on reopen the dropdown went back to default 0.020 even though
+    // the printer still holds the active profile at cali_idx=6.
+    (api.getKProfiles as ReturnType<typeof vi.fn>).mockResolvedValue({
+      profiles: [
+        {
+          slot_id: 6,
+          extruder_id: 0,
+          nozzle_id: 'HH00-0.4',
+          nozzle_diameter: '0.4',
+          filament_id: 'GFG98',
+          name: 'active-on-unconfigured-slot',
+          k_value: '0.030',
+          n_coef: '0',
+          ams_id: 0,
+          tray_id: 0,
+          setting_id: '',
+        },
+      ],
+    });
+    const slotInfo = {
+      ...defaultProps.slotInfo,
+      trayType: '',
+      traySubBrands: '',
+      caliIdx: 6,
+      extruderId: 0,
+      // savedPresetId intentionally omitted — no preset bound yet
+    };
+    render(<ConfigureAmsSlotModal {...defaultProps} slotInfo={slotInfo} />);
+
+    await waitFor(() => {
+      expect(screen.getByRole('option', { name: /active-on-unconfigured-slot/ })).toBeInTheDocument();
+    });
+  });
+
   it('does not include the active K-profile when caliIdx is 0 or null (#1689 guard)', async () => {
     // cali_idx == 0 / null means no profile is active (printer default 0.020).
     // The safety net only triggers for activeIdx > 0 — otherwise unrelated

frontend/src/components/ConfigureAmsSlotModal.tsx

@@ -748,7 +748,24 @@ export function ConfigureAmsSlotModal({
   }, [colorCatalog, selectedPresetInfo]);
 
   const matchingKProfiles = useMemo(() => {
-    if (!kprofilesData?.profiles || !selectedPresetInfo) return [];
+    if (!kprofilesData?.profiles) return [];
+    if (!selectedPresetInfo) {
+      // Assigned-but-unconfigured slot (filament loaded but the printer hasn't
+      // bound a preset yet: tray_type=""/tray_info_idx=""/no slot_preset_mappings
+      // row). The cali_idx safety net further down lives past the main name+id
+      // matcher and never runs from here, so surface the slot's currently-active
+      // K-profile directly so Configure Slot keeps showing it across reopen
+      // instead of dropping to default 0.020 (#1689 follow-up).
+      const activeIdx = slotInfo.caliIdx;
+      if (activeIdx != null && activeIdx > 0) {
+        const active = kprofilesData.profiles.find(
+          p => p.slot_id === activeIdx
+            && (slotInfo.extruderId === undefined || p.extruder_id === slotInfo.extruderId),
+        );
+        if (active) return [active];
+      }
+      return [];
+    }
 
     const { fullName, material, brand, filamentId } = selectedPresetInfo;
     const upperFullName = fullName.toUpperCase();

static/index.html

@@ -26,7 +26,7 @@
 
     <!-- Splash screens for iOS -->
     <link rel="apple-touch-startup-image" href="/img/android-chrome-512x512.png" />
-    <script type="module" crossorigin src="/assets/index-kb-CgWpZ.js"></script>
+    <script type="module" crossorigin src="/assets/index-QVjYxA_R.js"></script>
     <link rel="stylesheet" crossorigin href="/assets/index-7s3X35pi.css">
   </head>
   <body>