Description:
This PR enhances the election system by allowing election owners to upload candidate videos and images for a better user experience. The uploaded files are stored on IPFS using Pinata, ensuring decentralized and reliable storage. Additionally, tests have been updated to check for the presence of ipfsHash.

Changes:

• Integrated Pinata for uploading candidate videos and images to IPFS.
• Updated the frontend UI to support file uploads.
• Modified the smart contract (if applicable) to store ipfsHash for candidates.
• Updated the test cases to validate the IPFS integration.

Testing:

• Verified that videos and images are successfully uploaded to IPFS.
• Checked that the ipfsHash is correctly stored and retrieved.
• Ensured that the election creation and candidate registration flow remains functional.

Notes:

• Requires an API key for Pinata (documented in the README if needed).
• Open to suggestions for improving file size handling or optimizing upload performance.

Screenshots:

Related Issue:

Closes #48