Standardize URL Building Using urlBuilders Utility

[coderabbitai]

There are inconsistencies in how URLs are constructed across the codebase.

Files using direct string concatenation:

• apps/masterbots.ai/components/layout/header/user-menu.tsx
• apps/masterbots.ai/components/layout/profile/profile-page-sidebar.tsx
• apps/masterbots.ai/components/layout/sidebar/profile-sidebar.tsx
• apps/masterbots.ai/lib/hooks/use-sidebar.tsx
• apps/masterbots.ai/lib/threads.ts

Files using the urlBuilders utility:

• sidebar-link.tsx
• browse-list-item.tsx
• chat-accordion.tsx

To improve maintainability and consistency, all URL construction should utilize the urlBuilders utility.

Backlinks:

• PR: Fix browse category navigation #316
• Comment: Fix browse category navigation #316 (comment)

@AndlerRL