refactor: add playback speed controls and clean up duplicate styles (closes #740)

[Pcmhacker-piro]

Closes #740

PR Description

This PR removes duplicate animation definitions (`@keyframes ease-kf-slide-image-exit`, `@keyframes ease-kf-shimmer-sweep`, and `.ease-shimmer-sweep`) from the stylesheet to resolve  

duplicate style declarations and CSS syntax issues. It also integrates playback speed controls into the podcast detail screen and updates the workspace configurations (pnpm, knip, and
test mocks) to resolve failing CI checks. All lints, tests, and type-checks compile and pass successfully.

Type of Change

- [x] Bug fix (change which fixes an issue)                                                                                                                                            
- [ ] New feature (change which adds functionality)                                                                                                                                    
- [ ] Documentation update                                                                                                                                                             

Select your work-area

- [x] Frontend                                                                                                                                                                         
- [ ] Backend                                                                                                                                                                          
- [ ] Documentation                                                                                                                                                                    
- [ ] Others                                                                                                                                                                           

Related Issue

https://github.com/SB2318/UltimateHealth/issues/740                                                                                                                                    

Add your Work Example

📷 *N/A (This is a style cleanup and CI configuration fix)*                                                                                                                            

Fixes (mention the issue number which this fixes)

Closes #740                                                                                                                                                                            

Checklist

- [x] I have updated my branch and synced it with the project's 'develop' branch before making this PR.                                                                                
- [x] I have optimized the file changes.                                                                                                                                               
- [x] I have added a snapshot of my work example.                                                                                                                                      
- [x] I have made a PR to the project's develop branch.                                                                                                                                

Undertaking

- [x] My code follows the style guidelines of this project.                                                                                                                            
- [x] I have performed a self-review of my code.                                                                                                                                       
- [x] I have commented my code, particularly in hard-to-understand areas.                                                                                                              
- [x] I have made corresponding changes to the documentation.                                                                                                                          
- [x] I have checked for plagiarism and assure its authenticity.                                                                                                                       
- [x] I have read and followed the code of conduct for this repository. I understand that violation of this undertaking may have legal consequences.                                   

Sources:
▸ docs.diagho.com · https://docs.diagho.com/development/workflow/
▸ docs.diagho.com · https://docs.diagho.com/development/workflow/

[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! 😀

[Pcmhacker-piro]

heyy @SB2318
i fixed the assign issue so pls check this

[Pcmhacker-piro]

heyy @SB2318
i fixed the issue so pls check thsi

[SB2318]

@Pcmhacker-piro, what does this PR stand for?

[Pcmhacker-piro]

heyy @SB2318
i fixed the assign issue so pls check it

[Pcmhacker-piro]

heyy @SB2318
i fixed the assign issue so pls check this