T11a: Skeleton loading fade-out fixes

- Remove duplicate @keyframes shimmer (CSS conflict resolution)
- Remove dead .skeleton/.shimmer-stat/.shimmer-bar CSS classes
- Add hideSkeletons() fade-out to renderAssetList, renderCustList, renderActivity
- Dashboard and reports already had restore*Content() fade-out

static/index.html

@@ -4568,7 +4568,7 @@
           headers: { 'Content-Type': 'application/json' },
           body: JSON.stringify(payload),
         });
-        showToast('Asset created!');
+        showSuccessFeedback('Asset created!');
         document.getElementById('ocrCreateCard').style.display = 'none';
         document.getElementById('ocrResult').style.display = 'none';
         setOcrStatus('Ready — take another photo', 'success');
@@ -4874,7 +4874,7 @@
           headers: { 'Content-Type': 'application/json' },
           body: JSON.stringify(payload),
         });
-        showToast('Asset created!');
+        showSuccessFeedback('Asset created!');
         clearDraft();
         AppState.currentAssetId = asset.id;
         autoCheckin(asset.id);
@@ -6056,7 +6056,7 @@
           headers: { 'Content-Type': 'application/json' },
           body: JSON.stringify(payload),
         });
-        showToast('Asset updated!');
+        showSuccessFeedback('Asset updated!');
         viewAsset(AppState.currentAssetId);
       } catch (e) {
         showToast(e.message, true);