feat: add Excel-like column filters and License/Classification columns to Product Descriptions

- Added per-column filter popover (Excel-style) with search, multi-select checkboxes, and clear button
- Filter icon appears on hover for each column header; turns blue when active
- "Clear All Column Filters" button appears in toolbar when any column filter is active
- Added License and Classification columns to the table with OOC badge styling

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/components/ProductDescriptions.tsx

@@ -1,6 +1,6 @@
 import React, { useState, useMemo } from 'react';
 import { ExcelRow, COLUMNS } from '../types';
-import { Search, Filter, Edit2, ChevronDown, ChevronUp } from 'lucide-react';
+import { Search, Filter, Edit2, ChevronDown, ChevronUp, X, Check } from 'lucide-react';
 import { cn } from '../lib/utils';
 
 interface ProductDescriptionsProps {
@@ -19,6 +19,8 @@ export function ProductDescriptions({ data, onEdit }: ProductDescriptionsProps)
   const [sortDesc, setSortDesc] = useState(false);
   const [pageSize, setPageSize] = useState(25);
   const [page, setPage] = useState(1);
+  const [columnFilters, setColumnFilters] = useState<Record<number, string[]>>({});
+  const [openFilterCol, setOpenFilterCol] = useState<number | null>(null);
 
   const lines = useMemo(() => Array.from(new Set(data.map(r => r[COLUMNS.LINE]).filter(Boolean))), [data]);
   const licenses = useMemo(() => Array.from(new Set(data.map(r => r[COLUMNS.LICENSE]).filter(Boolean))), [data]);
@@ -56,6 +58,14 @@ export function ProductDescriptions({ data, onEdit }: ProductDescriptionsProps)
     if (lineFilter) result = result.filter(r => r.row[COLUMNS.LINE] === lineFilter);
     if (licenseFilter) result = result.filter(r => r.row[COLUMNS.LICENSE] === licenseFilter);
 
+    // Column-specific filters (Excel-like)
+    Object.entries(columnFilters).forEach(([colIdx, selectedValues]) => {
+      const vals = selectedValues as string[];
+      if (vals.length > 0) {
+        result = result.filter(r => vals.includes(String(r.row[Number(colIdx)] || '')));
+      }
+    });
+
     // Sorting
     if (sortCol !== null) {
       result.sort((a, b) => {
@@ -84,6 +94,22 @@ export function ProductDescriptions({ data, onEdit }: ProductDescriptionsProps)
     }
   };
 
+  const getUniqueValues = (col: number) => {
+    const values = data.map(r => String(r[col] || ''));
+    return Array.from(new Set(values)).sort();
+  };
+
+  const toggleColumnFilter = (col: number, value: string) => {
+    setColumnFilters(prev => {
+      const current = prev[col] || [];
+      const next = current.includes(value)
+        ? current.filter(v => v !== value)
+        : [...current, value];
+      return { ...prev, [col]: next };
+    });
+    setPage(1);
+  };
+
   const getRowColor = (row: ExcelRow) => {
     // EOL Rule: OOC Classification and 0 or negative stock (Item Available)
     const classification = String(row[COLUMNS.CLASSIFICATION] || '').toUpperCase().trim();
@@ -159,6 +185,18 @@ export function ProductDescriptions({ data, onEdit }: ProductDescriptionsProps)
             className="w-full pl-9 pr-4 py-2 bg-slate-900 border border-slate-700 rounded-md text-sm text-white focus:outline-none focus:border-blue-500 focus:ring-1 focus:ring-blue-500"
           />
         </div>
+        {(Object.values(columnFilters) as string[][]).some(v => v.length > 0) && (
+          <button
+            onClick={() => {
+              setColumnFilters({});
+              setPage(1);
+            }}
+            className="flex items-center gap-2 px-4 py-2 bg-red-600/10 text-red-400 hover:bg-red-600 hover:text-white rounded-md text-sm font-medium transition-colors border border-red-600/20"
+          >
+            <X className="w-4 h-4" />
+            Clear All Column Filters
+          </button>
+        )}
         <select
           value={lineFilter}
           onChange={e => { setLineFilter(e.target.value); setPage(1); }}
@@ -186,6 +224,8 @@ export function ProductDescriptions({ data, onEdit }: ProductDescriptionsProps)
                   { col: COLUMNS.ARTICLE_NO, label: 'Article No.' },
                   { col: COLUMNS.ARTICLE_NAME, label: 'Article Name' },
                   { col: COLUMNS.LINE, label: 'Line' },
+                  { col: COLUMNS.LICENSE, label: 'License' },
+                  { col: COLUMNS.CLASSIFICATION, label: 'Classification' },
                   { col: COLUMNS.LONG_DE, label: 'Long DE' },
                   { col: COLUMNS.LONG_EN, label: 'Long EN' },
                   { col: COLUMNS.SHORT_DE, label: 'Short DE' },
@@ -193,15 +233,45 @@ export function ProductDescriptions({ data, onEdit }: ProductDescriptionsProps)
                 ].map(({ col, label }) => (
                   <th 
                     key={col} 
-                    className="px-4 py-3 font-medium cursor-pointer hover:text-white transition-colors select-none"
+                    className="px-4 py-3 font-medium transition-colors select-none group relative"
-                    onClick={() => handleSort(col)}
                   >
-                    <div className="flex items-center gap-1">
+                    <div className="flex items-center justify-between gap-1">
-                      {label}
+                      <div className="flex items-center gap-1 cursor-pointer hover:text-white" onClick={() => handleSort(col)}>
-                      {sortCol === col && (
+                        {label}
-                        sortDesc ? <ChevronDown className="w-4 h-4" /> : <ChevronUp className="w-4 h-4" />
+                        {sortCol === col && (
-                      )}
+                          sortDesc ? <ChevronDown className="w-4 h-4" /> : <ChevronUp className="w-4 h-4" />
+                        )}
+                      </div>
+                      <button
+                        onClick={(e) => {
+                          e.stopPropagation();
+                          setOpenFilterCol(openFilterCol === col ? null : col);
+                        }}
+                        className={cn(
+                          "p-1 rounded hover:bg-slate-700 transition-colors",
+                          (columnFilters[col]?.length || 0) > 0 ? "text-blue-400 bg-blue-400/10" : "text-slate-500 opacity-0 group-hover:opacity-100"
+                        )}
+                      >
+                        <Filter className="w-3.5 h-3.5" />
+                      </button>
                     </div>
+
+                    {openFilterCol === col && (
+                      <ColumnFilterPopover
+                        uniqueValues={getUniqueValues(col)}
+                        selectedValues={columnFilters[col] || []}
+                        onToggle={(val) => toggleColumnFilter(col, val)}
+                        onClear={() => {
+                          setColumnFilters(prev => {
+                            const next = { ...prev };
+                            delete next[col];
+                            return next;
+                          });
+                          setOpenFilterCol(null);
+                        }}
+                        onClose={() => setOpenFilterCol(null)}
+                      />
+                    )}
                   </th>
                 ))}
                 <th className="px-4 py-3 font-medium text-right">Actions</th>
@@ -213,6 +283,17 @@ export function ProductDescriptions({ data, onEdit }: ProductDescriptionsProps)
                   <td className="px-4 py-3 font-mono text-slate-300 text-xs">{row[COLUMNS.ARTICLE_NO]}</td>
                   <td className="px-4 py-3 font-medium text-white max-w-[200px] truncate" title={row[COLUMNS.ARTICLE_NAME]}>{row[COLUMNS.ARTICLE_NAME]}</td>
                   <td className="px-4 py-3 text-slate-300 text-xs">{row[COLUMNS.LINE]}</td>
+                  <td className="px-4 py-3 text-slate-300 text-xs truncate max-w-[120px]" title={row[COLUMNS.LICENSE]}>{row[COLUMNS.LICENSE] || '—'}</td>
+                  <td className="px-4 py-3">
+                    <span className={cn(
+                      "px-2 py-0.5 rounded text-[10px] font-bold border",
+                      String(row[COLUMNS.CLASSIFICATION]).includes('OOC') 
+                        ? "bg-amber-500/10 text-amber-500 border-amber-500/20" 
+                        : "bg-slate-700/50 text-slate-400 border-slate-600/50"
+                    )}>
+                      {row[COLUMNS.CLASSIFICATION] || '—'}
+                    </span>
+                  </td>
                   <td className="px-4 py-3"><Badge content={row[COLUMNS.LONG_DE]} row={row} /></td>
                   <td className="px-4 py-3"><Badge content={row[COLUMNS.LONG_EN]} row={row} /></td>
                   <td className="px-4 py-3"><Badge content={row[COLUMNS.SHORT_DE]} row={row} /></td>
@@ -274,3 +355,73 @@ export function ProductDescriptions({ data, onEdit }: ProductDescriptionsProps)
     </div>
   );
 }
+
+interface ColumnFilterPopoverProps {
+  uniqueValues: string[];
+  selectedValues: string[];
+  onToggle: (val: string) => void;
+  onClear: () => void;
+  onClose: () => void;
+}
+
+function ColumnFilterPopover({ uniqueValues, selectedValues, onToggle, onClear, onClose }: ColumnFilterPopoverProps) {
+  const [search, setSearch] = useState('');
+  
+  const filteredValues = useMemo(() => {
+    return uniqueValues.filter(v => v.toLowerCase().includes(search.toLowerCase()));
+  }, [uniqueValues, search]);
+
+  return (
+    <div className="absolute top-full left-0 mt-1 w-64 bg-slate-800 border border-slate-700 rounded-lg shadow-2xl z-50 p-3 flex flex-col gap-3 animate-in fade-in zoom-in-95 duration-100">
+      <div className="relative">
+        <Search className="absolute left-2 top-1/2 -translate-y-1/2 w-3.5 h-3.5 text-slate-500" />
+        <input
+          type="text"
+          placeholder="Filter values..."
+          value={search}
+          onChange={e => setSearch(e.target.value)}
+          className="w-full bg-slate-900 border border-slate-700 rounded p-1.5 pl-8 text-xs text-white focus:outline-none focus:border-blue-500"
+          autoFocus
+        />
+      </div>
+
+      <div className="max-h-48 overflow-y-auto space-y-1 pr-1 custom-scrollbar">
+        {filteredValues.map(val => (
+          <label key={val} className="flex items-center gap-2 p-1.5 hover:bg-slate-700/50 rounded cursor-pointer group">
+            <div className={cn(
+              "w-4 h-4 rounded border flex items-center justify-center transition-colors",
+              selectedValues.includes(val) ? "bg-blue-600 border-blue-600" : "border-slate-600 bg-slate-900 group-hover:border-slate-500"
+            )}>
+              {selectedValues.includes(val) && <Check className="w-3 h-3 text-white" />}
+            </div>
+            <input
+              type="checkbox"
+              className="hidden"
+              checked={selectedValues.includes(val)}
+              onChange={() => onToggle(val)}
+            />
+            <span className="text-xs text-slate-300 truncate" title={val}>{val || '(Empty)'}</span>
+          </label>
+        ))}
+        {filteredValues.length === 0 && (
+          <div className="text-[10px] text-slate-500 text-center py-2">No values found</div>
+        )}
+      </div>
+
+      <div className="flex items-center justify-between pt-2 border-t border-slate-700 mt-1">
+        <button
+          onClick={onClear}
+          className="text-[10px] font-medium text-slate-400 hover:text-white transition-colors"
+        >
+          Clear Current
+        </button>
+        <button
+          onClick={onClose}
+          className="px-3 py-1 bg-blue-600 hover:bg-blue-700 text-white text-[10px] font-bold rounded transition-colors shadow-sm"
+        >
+          OK
+        </button>
+      </div>
+    </div>
+  );
+}