[feat]: Add functional mail search to filter emails based on subject and body

[sumamakhan761]

Feature description

Currently, the search bar in the Mail component UI is only present visually, but it doesn’t perform any actual filtering of emails based on user input

When a user starts typing in the search input, mail list should dynamically update in real-time. It should filter and display only the mails where the subject or body text includes the search query (case insensitive).

this is a very standard user expectation.

below is the issue video 👇

Additional Context

Screen Record of Issue

Screen.Recording.2025-04-06.204717.mp4

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• I've made research efforts and searched the documentation
• I've searched for existing issues and PRs