Export CSV based on currently visible columns instead of hardcoded list

- CSV export now respects column visibility settings, exporting only the
  columns the user has toggled on
- Boolean fields export as "Yes"/"No", arrays as comma-separated values
- Toast message shows row and column counts for confirmation

Made-with: Cursor

src/components/cards/dashboard-content.tsx

@@ -6,7 +6,7 @@ import { toast } from "sonner";
 
 import { StatCards, type StatFilter } from "./stat-cards";
 import { Filters } from "./filters";
-import { DataTable, getDefaultColumnVisibility } from "./data-table";
+import { DataTable, getDefaultColumnVisibility, ALL_TOGGLEABLE_COLUMNS } from "./data-table";
 import { SelectionToolbar } from "./selection-toolbar";
 import { UploadModal, type UploadingFile } from "./upload-modal";
 import { createColumns, COPYABLE_FIELDS, type ResponseCard } from "./columns";
@@ -173,17 +173,25 @@ export function DashboardContent() {
       return;
     }
 
-    const headers = [
-      "Name", "Email", "Phone", "City", "State", "Gender",
-      "Visit Type", "Attendance", "Service", "OCR Status", "Review Status",
-      "Confidence",
-    ];
-    const rows = data.map((c) => [
-      c.name || "", c.email || "", c.cellPhone || "", c.city || "",
-      c.state || "", c.gender || "", c.visitType || "",
-      c.attendanceDuration || "", c.serviceAttended || "", c.ocrStatus,
-      c.reviewStatus, c.ocrConfidence?.toString() || "",
-    ]);
+    const visibleCols = ALL_TOGGLEABLE_COLUMNS.filter(
+      (col) => columnVisibility[col.id] !== false
+    );
+
+    if (visibleCols.length === 0) {
+      toast.error("No columns visible to export");
+      return;
+    }
+
+    const headers = visibleCols.map((c) => c.label);
+    const rows = data.map((card) =>
+      visibleCols.map((col) => {
+        const val = (card as Record<string, unknown>)[col.id];
+        if (val == null) return "";
+        if (typeof val === "boolean") return val ? "Yes" : "No";
+        if (Array.isArray(val)) return val.filter(Boolean).join(", ");
+        return String(val);
+      })
+    );
 
     const csv = [headers, ...rows]
       .map((r) => r.map((v) => `"${v.replace(/"/g, '""')}"`).join(","))
@@ -196,7 +204,7 @@ export function DashboardContent() {
     a.download = `response-cards-${new Date().toISOString().split("T")[0]}.csv`;
     a.click();
     URL.revokeObjectURL(url);
-    toast.success("CSV exported");
+    toast.success(`Exported ${data.length} rows × ${visibleCols.length} columns`);
   };
 
   const columns = React.useMemo(