feat: create 'Siddh Archive' for completed spiritual goals

[nitishchaubeyy]

📝 Problem Statement

Currently, once a Sankalp reaches 100%, it stays on the dashboard or has to be deleted. There is no way to celebrate or look back at past spiritual achievements.

🚀 Proposed Solution

Create a separate section/page called "Siddh Archive" (Wall of Fame) where completed sankalps are moved.

Key Changes:

• Database: Update sankalps table to handle a status (e.g., 'active', 'siddh', 'archived').
• Logic: Add an "Archive" button when a sankalp hits 100% progress.
• UI: Create an ArchivePage to display cards of completed goals with their completion dates.

✅ Acceptance Criteria

• The Main Dashboard stays clean, showing only active goals.
• Users can view their full history of "Siddh" goals.
• Each archived card shows a "Siddh" badge with the date of achievement.