feat(projects): add project creation wizard with enhanced UX

Add new project creation wizard component with improved user experience
and better input field interactions. Integrate projects API routes on
the backend to support CRUD operations for project management.

Changes include:
- Add ProjectCreationWizard component with step-by-step project setup
- Improve input hint visibility to hide when user starts typing
- Refactor project creation state management in Sidebar component
- Add ReactDOM import for portal-based wizard rendering

The wizard provides a more intuitive onboarding experience for users
creating new projects, while the enhanced input hints reduce visual
clutter during active typing.

src/components/ChatInterface.jsx

@@ -4710,13 +4710,15 @@ function ChatInterface({ selectedProject, selectedSession, ws, sendMessage, mess
             </button>
 
             {/* Hint text inside input box at bottom */}
-            <div className="absolute bottom-1 left-12 right-14 sm:right-40 text-xs text-gray-400 dark:text-gray-500 pointer-events-none hidden sm:block">
+            <div className={`absolute bottom-1 left-12 right-14 sm:right-40 text-xs text-gray-400 dark:text-gray-500 pointer-events-none hidden sm:block transition-opacity duration-200 ${
+              input.trim() ? 'opacity-0' : 'opacity-100'
+            }`}>
               {sendByCtrlEnter
                 ? "Ctrl+Enter to send • Shift+Enter for new line • Tab to change modes • / for slash commands"
                 : "Enter to send • Shift+Enter for new line • Tab to change modes • / for slash commands"}
             </div>
             <div className={`absolute bottom-1 left-12 right-14 text-xs text-gray-400 dark:text-gray-500 pointer-events-none sm:hidden transition-opacity duration-200 ${
-              isInputFocused ? 'opacity-100' : 'opacity-0'
+              isInputFocused && !input.trim() ? 'opacity-100' : 'opacity-0'
             }`}>
               {sendByCtrlEnter
                 ? "Ctrl+Enter to send • Tab for modes • / for commands"