fix: update page title and favicon badge on background unread messages

[Pratikshya32]

Resolves #136

Changes

• Implemented browser tab title updates and dynamic favicon badging to notify users of new messages in real-time when the application tab is in the background (hidden).
• Tracks unread messages count while the tab is hidden and updates the title dynamically to (count) PiperChat.
• Renders a custom red badge on the tab's favicon dynamically using HTML5 Canvas.
• Automatically resets the tab title to PiperChat and clears the favicon badge once the tab is focused or returns to visibility.

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