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/App.tsx

@@ -1,5 +1,5 @@
 import { useState, useCallback, useEffect } from "react";
-import type { TaskDetail, TaskCreateInput, Task } from "@hai/core";
+import type { TaskDetail, TaskCreateInput, Task } from "@kb/core";
 import { fetchConfig, fetchSettings, updateSettings } from "./api";
 import { Header } from "./components/Header";
 import { Board } from "./components/Board";