Added support for watch progress for the session

[abhishek-fluidai]

Outcome

This PR is to save the watched video duration for various videos, so that they can resume playing from where they left off.
In the current implementation, I am saving time_stamps in session storage, so these persist only for the current session.
I am expecting it to make persistent in future PRs.

Demo

demo video

[user234683]

Since the persistent version would have to be done quite differently, would prefer we just do that first. I wrote out an implementation plan here if you or anyone else would like to give it a shot:
#155 (comment)

[abhishek-fluidai]

@user234683 Sorry for the delay. I forgot about this. I would like to implement it. Probably start on this weekend. I'll keep you posted. Thanks!

[CodiumAI-Agent]

PR Reviewer Guide 🔍

⏱️ Estimated effort to review: 2 🔵🔵⚪⚪⚪

🧪 No relevant tests

🔒 No security concerns identified

⚡ Key issues to review Code Robustness The extraction of video_id from the URL is fragile and may fail if the URL structure changes or includes additional parameters before the video ID. Consider using URLSearchParams for a more robust solution. Error Handling There is no error handling for cases where sessionStorage might be disabled or full, which could lead to unhandled exceptions. Code Duplication The sessionStorage.getItem(video_id) is called twice, which is inefficient. Consider storing the result in a variable and reusing it.