feat: replace playback speed buttons with floating speed selector (#1072)

[anjalikumari45]

PR Description

Replaced the existing cycling playback speed buttons on Article and Podcast screens with a floating speed selector menu that displays all available speeds in a compact list, improving UX with fewer taps and better visual feedback.

Type of Change

• New feature (change which adds functionality)

Select your work-area

• Frontend

Related Issue

Fixes #1072

Changes Made

• Created new FloatingSpeedSelector.tsx component supporting speeds: 0.5x, 0.75x, 1x, 1.25x, 1.5x, 1.75x, 2x
• Currently selected speed is visually highlighted in blue
• Selector dismisses on speed selection or outside tap
• Replaced handleCycleSpeed with handleSpeedSelect in PodcastPlayer.tsx
• Replaced cycling handleSpeedChange logic in ArticleScreen.tsx
• Updated PLAYBACK_SPEEDS array to include all 7 speeds
• Applied floating selector consistently on both Article and Podcast screens

Fixes

Closes #1072

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, I can't accept this PR. You are not assigned to the issue.