refactor(HAI-116): rename kb to hai across all packages, CLI, and docs

- Rename npm packages from @kb/* to @hai/* and update all workspace references
- Rename CLI binary from kb to hai and config directory from .kb to .hai
- Update dashboard UI branding, titles, and references from kb to hai
- Update all test files, CI workflows, and documentation to reflect new naming
- Run comprehensive grep verification to ensure no stale kb references remain

packages/dashboard/app/components/__tests__/Board.test.tsx

@@ -1,7 +1,7 @@
 import { describe, it, expect, vi } from "vitest";
 import { render, screen } from "@testing-library/react";
 import { Board } from "../Board";
-import { COLUMNS } from "@hai/core";
+import { COLUMNS } from "@kb/core";
 
 // Mock child components so we only test Board's own rendering
 vi.mock("../Column", () => ({