Add classification dropdown in Missing Data edit panel

src/components/MissingDataView.tsx

@@ -390,18 +390,21 @@ export function MissingDataView({ data, headers, onSaveRow, onCaptureState }: Mi
             <div className="flex-1 overflow-auto p-6 space-y-5">
               <div className="flex flex-col gap-1.5">
                 <label className="text-xs font-medium text-slate-400 uppercase tracking-wider">Classification</label>
-                <input
-                  type="text"
+                <select
                   value={editing.classification}
                   onChange={e => setEditing(prev => prev ? { ...prev, classification: e.target.value } : prev)}
-                  placeholder="e.g. CORE, OOC..."
                   className={cn(
                     "w-full bg-slate-900 border rounded-md px-3 py-2.5 text-sm text-white focus:outline-none focus:ring-1 transition-colors",
                     editing.classification !== String(editingRow[COLUMNS.CLASSIFICATION] || '')
                       ? "border-blue-500 focus:ring-blue-500"
                       : "border-slate-700 focus:border-slate-500 focus:ring-slate-500"
                   )}
-                />
+                >
+                  <option value="">Select classification...</option>
+                  {getUniqueValues(COLUMNS.CLASSIFICATION).map(val => (
+                    <option key={val} value={val}>{val}</option>
+                  ))}
+                </select>
               </div>
 
               {launchDateCol >= 0 && (