refactor(board-view): reorganize into modular folder structure

- Extract board-view into organized subfolders following new pattern:
  - components/: kanban-card, kanban-column
  - dialogs/: all dialog and modal components (8 files)
  - hooks/: all board-specific hooks (10 files)
  - shared/: reusable components between dialogs (model-selector, etc.)
- Rename all files to kebab-case convention
- Add barrel exports (index.ts) for clean imports
- Add docs/folder-pattern.md documenting the folder structure
- Reduce board-view.tsx from ~3600 lines to ~490 lines

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

apps/app/src/components/views/board-view/dialogs/delete-all-verified-dialog.tsx

@@ -0,0 +1,54 @@
+"use client";
+
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogFooter,
+  DialogHeader,
+  DialogTitle,
+} from "@/components/ui/dialog";
+import { Button } from "@/components/ui/button";
+import { Trash2 } from "lucide-react";
+
+interface DeleteAllVerifiedDialogProps {
+  open: boolean;
+  onOpenChange: (open: boolean) => void;
+  verifiedCount: number;
+  onConfirm: () => void;
+}
+
+export function DeleteAllVerifiedDialog({
+  open,
+  onOpenChange,
+  verifiedCount,
+  onConfirm,
+}: DeleteAllVerifiedDialogProps) {
+  return (
+    <Dialog open={open} onOpenChange={onOpenChange}>
+      <DialogContent data-testid="delete-all-verified-dialog">
+        <DialogHeader>
+          <DialogTitle>Delete All Verified Features</DialogTitle>
+          <DialogDescription>
+            Are you sure you want to delete all verified features? This action
+            cannot be undone.
+            {verifiedCount > 0 && (
+              <span className="block mt-2 text-yellow-500">
+                {verifiedCount} feature(s) will be deleted.
+              </span>
+            )}
+          </DialogDescription>
+        </DialogHeader>
+        <DialogFooter>
+          <Button variant="ghost" onClick={() => onOpenChange(false)}>
+            Cancel
+          </Button>
+          <Button variant="destructive" onClick={onConfirm} data-testid="confirm-delete-all-verified">
+            <Trash2 className="w-4 h-4 mr-2" />
+            Delete All
+          </Button>
+        </DialogFooter>
+      </DialogContent>
+    </Dialog>
+  );
+}