Implement Habit Search Functionality

[A23droid]

Description

Add a search bar that allows users to quickly locate habits by name. The search should filter results dynamically as the user types. Implement efficient filtering logic and ensure performance remains stable with large lists.

Acceptance Criteria

• A search input is visible above the habit list.
• Habit list filters results in real time as the user types.
• Search matches partial words and is case-insensitive.
• No noticeable lag for large habit datasets.
• If no habits match the query, an appropriate empty-state message is shown.