feat(ui): move export/import features from board header to project settings

Relocate the export and import features functionality from the board header
dropdown menu to a new "Data" section in project settings for better UX.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/ui/src/components/views/project-settings-view/data-management-section.tsx

@@ -0,0 +1,110 @@
+import { useState } from 'react';
+import { cn } from '@/lib/utils';
+import { Button } from '@/components/ui/button';
+import { Database, Download, Upload } from 'lucide-react';
+import { ExportFeaturesDialog } from '../board-view/dialogs/export-features-dialog';
+import { ImportFeaturesDialog } from '../board-view/dialogs/import-features-dialog';
+import { useBoardFeatures } from '../board-view/hooks';
+import type { Project } from '@/lib/electron';
+
+interface DataManagementSectionProps {
+  project: Project;
+}
+
+export function DataManagementSection({ project }: DataManagementSectionProps) {
+  const [showExportDialog, setShowExportDialog] = useState(false);
+  const [showImportDialog, setShowImportDialog] = useState(false);
+
+  // Fetch features and persisted categories using the existing hook
+  const { features, persistedCategories, loadFeatures } = useBoardFeatures({
+    currentProject: project,
+  });
+
+  return (
+    <>
+      <div
+        className={cn(
+          'rounded-2xl overflow-hidden',
+          'border border-border/50',
+          'bg-gradient-to-br from-card/90 via-card/70 to-card/80 backdrop-blur-xl',
+          'shadow-sm shadow-black/5'
+        )}
+      >
+        <div className="p-6 border-b border-border/50 bg-gradient-to-r from-transparent via-accent/5 to-transparent">
+          <div className="flex items-center gap-3 mb-2">
+            <div className="w-9 h-9 rounded-xl bg-gradient-to-br from-brand-500/20 to-brand-600/10 flex items-center justify-center border border-brand-500/20">
+              <Database className="w-5 h-5 text-brand-500" />
+            </div>
+            <h2 className="text-lg font-semibold text-foreground tracking-tight">
+              Data Management
+            </h2>
+          </div>
+          <p className="text-sm text-muted-foreground/80 ml-12">
+            Export and import features to backup your data or share with other projects.
+          </p>
+        </div>
+        <div className="p-6 space-y-6">
+          {/* Export Section */}
+          <div className="space-y-3">
+            <div>
+              <h3 className="text-sm font-medium text-foreground">Export Features</h3>
+              <p className="text-xs text-muted-foreground mt-1">
+                Download all features as a JSON or YAML file for backup or sharing.
+              </p>
+            </div>
+            <Button
+              variant="outline"
+              onClick={() => setShowExportDialog(true)}
+              className="gap-2"
+              data-testid="export-features-button"
+            >
+              <Download className="w-4 h-4" />
+              Export Features
+            </Button>
+          </div>
+
+          {/* Separator */}
+          <div className="border-t border-border/50" />
+
+          {/* Import Section */}
+          <div className="space-y-3">
+            <div>
+              <h3 className="text-sm font-medium text-foreground">Import Features</h3>
+              <p className="text-xs text-muted-foreground mt-1">
+                Import features from a previously exported JSON or YAML file.
+              </p>
+            </div>
+            <Button
+              variant="outline"
+              onClick={() => setShowImportDialog(true)}
+              className="gap-2"
+              data-testid="import-features-button"
+            >
+              <Upload className="w-4 h-4" />
+              Import Features
+            </Button>
+          </div>
+        </div>
+      </div>
+
+      {/* Export Dialog */}
+      <ExportFeaturesDialog
+        open={showExportDialog}
+        onOpenChange={setShowExportDialog}
+        projectPath={project.path}
+        features={features}
+      />
+
+      {/* Import Dialog */}
+      <ImportFeaturesDialog
+        open={showImportDialog}
+        onOpenChange={setShowImportDialog}
+        projectPath={project.path}
+        categorySuggestions={persistedCategories}
+        onImportComplete={() => {
+          loadFeatures();
+        }}
+      />
+    </>
+  );
+}