Add helper for confirm dialog interactions in browser tests

[coderabbitai]

Context

During review of PR #8510, it was identified that test code could benefit from a dedicated helper for interacting with confirm dialogs and similar modal dialogs.

Current Situation

Tests currently interact with confirm dialogs using combinations of:

• getByRole('dialog', { name: '...' })
• .locator('..') chains
• .getByRole('button', { name: 'Confirm' }) for confirmation

Proposed Enhancement

Create a reusable helper class or utility function to simplify confirm dialog interactions in browser tests, similar to existing helpers like BaseDialog, ContextMenu, etc.

References

• PR: test(browser): refactor browser tests for reliability and maintainability #8510
• Comment: test(browser): refactor browser tests for reliability and maintainability #8510 (comment)
• Requested by: @christian-byrne

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[christian-byrne]

Closing: ConfirmDialog helper already exists in browser_tests/fixtures/ComfyPage.ts (class ConfirmDialog, line 114). It provides click() method for confirm/delete/overwrite/cancel actions and is available as comfyPage.confirmDialog in tests. The nodeLibrary tests at browser_tests/tests/sidebar/nodeLibrary.spec.ts could be updated to use this helper, but the helper itself is already implemented.