feat: fix Game End && Timer logic

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Fixes : #240

Fixed Changes

1. Players will be notified about the winner's name, instead of an undefined alert in the console.
2. Fixed timer logic, so that it does n't run after 00:00

Screencast

Screencast from 27-04-24 12:41:27 PM IST.webm

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@hkirat can you check this out!!

[hkirat]

Ending logic handled in https://github.com/code100x/chess/pull/269