Fix: Prevent Multiple Search Icons in Command Menu

[Rithik-93]

Description:
This PR fixes an issue where clicking the search button multiple times caused multiple search icons to appear in the search bar. The issue was caused by continuously appending new items to the navigation stack instead of replacing the existing search page entry.

Before:

searchBefore.mp4

After:

searchAfter.mp4

[github-actions]

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[greptile-apps]

PR Summary

This PR modifies the command menu navigation stack logic to prevent duplicate search icons from appearing when clicking the search button multiple times.

• Added navigation stack validation in packages/twenty-front/src/modules/command-menu/hooks/useCommandMenu.ts to check for existing pages before adding new ones
• Implemented stack replacement logic when navigating to an existing page or when resetNavigationStack is true
• Fixed visual bug where multiple search icons would stack in the command menu interface

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