feat: add empty state component for offline podcasts screen (#1078)

[anjalikumari45]

PR Description

Added a dedicated empty state component for the Offline Podcasts screen when no podcasts have been downloaded, replacing the blank screen with meaningful feedback and a call-to-action button.

Type of Change

• New feature (change which adds functionality)

Select your work-area

• Frontend

Related Issue

Fixes #1078

Changes Made

• Added NoOfflinePodcastState component in EmptyStates.tsx
• Title: "No Offline Podcasts Yet"
• Description: "Download podcasts to listen anytime, even without an internet connection."
• Added "Browse Podcasts" CTA button that navigates users to the Podcast discovery screen
• Replaced blank empty screen with dedicated empty state in OfflinePodcastList.tsx
• Follows existing empty state design patterns with animation support
• Supports both light and dark themes

Fixes

Closes #1078

Checklist

• I have updated my branch and synced it with the project's develop branch before making this PR.
• I have optimized the file changes.
• I have made a PR to the project's develop branch.

Undertaking

• My code follows the style guidelines of this project.
• I have performed a self-review of my code.
• I have checked for plagiarism and assure its authenticity.
• I have read and followed the code of conduct for this repository. I understand that violation of this undertaking may have legal consequences.
• I Agree

[github-actions]

Thank you @, for creating the PR and contributing to our UltimateHealth project 💗.
Our team will review the PR and will reach out to you soon! 😇
Make sure that you have marked all the tasks that you are done with ✅.
Thank you for your patience! 😀

[SB2318]

Sorry @anjalikumari45, you are not assigned to the issue. Your previous commenter has no active issues on their head.