fix(editor): Close Find popup when Replace is triggered (Fixes #3428)

[LalitNarayanYadav]

Description

This PR resolves issue #3428 where the Replace popup would fail to open when the Find popup was active. The fix ensures smooth switching between Find and Replace dialogs.

Changes

• Modified showReplace() to close active Find dialog before opening Replace
• Updated keyboard shortcut handlers in extraKeys configuration
• Ensured consistent behavior for both UI buttons and keyboard shortcuts

Testing

Verified Scenarios

✅ Find (Ctrl+F) → Replace (Ctrl+H)
✅ Click Find → Click Replace
✅ Mixed usage (shortcuts + UI buttons)
✅ Persistent search highlights during switches
✅ No regression in core search functionality

Checklist

• My code follows the project's style guidelines
• I have tested my changes thoroughly
• I have referenced the relevant issue (Replace Popup Doesn’t Open When Find Popup is Active (via UI or Shortcut) #3428)
• My changes generate no new warnings/errors

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[LalitNarayanYadav]

Hi @therewasaguy @limzykenneth, could you please review this fix for #3428 when you have time?
This resolves the Find/Replace popup conflict. Thank you!