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/hooks/useTasks.ts

@@ -1,5 +1,5 @@
 import { useState, useEffect, useCallback, useRef } from "react";
-import type { Task, Column, TaskCreateInput, MergeResult } from "@hai/core";
+import type { Task, Column, TaskCreateInput, MergeResult } from "@kb/core";
 import * as api from "../api";
 
 export function useTasks() {