feat(catalog): supplier catalog cleanup, fuzzy matching, and navigation fixes

- Cleaned 137+ fake engine-displacement models from supplier imports
  (v3/v4 scripts: Chevrolet, Ford, Chrysler, Dodge, Jeep, Nissan, etc.)
- Removed 1,251+ corrupted models (INT. prefixes, year-suffix, torque specs,
  empty names, trailing-year variants)
- Migrated supplier tables to master DB (supplier_catalog,
  supplier_catalog_compat, supplier_catalog_interchange)
- Fixed _get_mye_ids_with_parts() to query supplier_catalog_compat from
  master DB so supplier-only vehicles appear for all tenants
- Added fuzzy model matcher with parenthesis stripping, noise suffix removal,
  compact matching, prefix/substring fallback, model aliases, and ±3 year
  proximity
- Matched compat rows: KEEP GREEN +14,152, KNADIAN +3,021, VAZLO +127,500,
  LUK +477, RAYBESTOS +1,743
- Added KNADIAN catalog importer with year-range expansion and future-year
  filtering
- Added VAZLO catalog importer with position parsing and SKU-in-model cleanup
- Added Keep Green, LUK, Yokomitsu, Raybestos catalog importers
- Cache clearing after cleanups (_classify_cache_*, nexus:mye_ids:*,
  nexus:brand_mye_counts:*)

Final match rates:
- KEEP GREEN: 90.3%
- VAZLO: 93.6%
- YOKOMITSU: 100.0%
- KNADIAN: 57.4%
- LUK: 51.0%
- RAYBESTOS: 55.9%

pos/static/js/dashboard-stats.js

@@ -8,6 +8,9 @@
   const token = localStorage.getItem('pos_token') || '';
   if (!token) return;
 
+  let hourlyChart = null;
+  let topProductsChart = null;
+
   function headers() {
     return { 'Authorization': 'Bearer ' + token, 'Content-Type': 'application/json' };
   }
@@ -31,10 +34,11 @@
   function renderHourlyChart(hourly) {
     const ctx = document.getElementById('hourlySalesChart');
     if (!ctx) return;
+    if (hourlyChart) { hourlyChart.destroy(); hourlyChart = null; }
     const labels = hourly.map(function (h) { return h.hour + ':00'; });
     const totals = hourly.map(function (h) { return h.total; });
 
-    new Chart(ctx, {
+    hourlyChart = new Chart(ctx, {
       type: 'bar',
       data: {
         labels: labels,
@@ -62,10 +66,38 @@
   function renderTopProductsChart(topProducts) {
     const ctx = document.getElementById('topProductsChart');
     if (!ctx) return;
+    if (topProductsChart) { topProductsChart.destroy(); topProductsChart = null; }
+    if (!topProducts || topProducts.length === 0) {
+      // No sales today — render a friendly empty-state mini chart so the canvas
+      // doesn't collapse or leave a blank hole.
+      topProductsChart = new Chart(ctx, {
+        type: 'doughnut',
+        data: {
+          labels: ['Sin ventas hoy'],
+          datasets: [{
+            data: [1],
+            backgroundColor: ['rgba(136, 136, 136, 0.25)'],
+            borderWidth: 0,
+          }]
+        },
+        options: {
+          responsive: true,
+          maintainAspectRatio: false,
+          plugins: {
+            legend: {
+              position: 'right',
+              labels: { color: '#888', font: { size: 10 }, boxWidth: 10 }
+            }
+          }
+        }
+      });
+      return;
+    }
+
     const labels = topProducts.map(function (p) { return p.name.substring(0, 20); });
     const revenues = topProducts.map(function (p) { return p.revenue; });
 
-    new Chart(ctx, {
+    topProductsChart = new Chart(ctx, {
       type: 'doughnut',
       data: {
         labels: labels,