[Refactor] Fix timestamp links in comments seeking in internal player

[Ecomont]

What is it?

• Bugfix (user facing)
• Feature (user facing) ⚠️ Your PR must target the refactor branch
• Codebase improvement (dev facing)
• Meta improvement to the project (dev facing)

Description of the changes in your PR

• Add timestamp click handling to DescriptionText in Compose.
• Detect timestamp patterns in comment text and convert them into clickable timestamp links.
• Pass an onTimestampClick callback from the comments UI down to the text component.
• Make timestamp clicks in comments seek the currently opened video instead of opening an external browser or app.
• Keep normal non-timestamp links handled as regular links.
• Reuse the existing timestamp parsing logic instead of introducing a separate parser.

Before/After Screenshots/Screen Record

• Before:

bugVideo.mp4

• After:

afterVideo.mp4

Fixes the following issue(s)

• Fixes [Refactor] Timestamp links in comments open external browser instead of seeking video #13414

APK testing

The APK can be found by going to the "Checks" tab below the title. On the left pane, click on "CI", scroll down to "artifacts" and click "app" to download the zip file which contains the debug APK of this PR. You can find more info and a video demonstration on this wiki page.

Due diligence

• I read the contribution guidelines.
• The proposed changes follow the AI policy.
• I tested the changes using an emulator or a physical device.