refactor alert dialog styles, use vscode theme

[cannuri]

Context

The alert dialogs were not reflecting the currently set VS Code Theme.
I fixed the styles and also changed the button naming from "No/Yes" to "Cancel / Discard changes" to follow design principles for better User Experience.
This fixes #1469
This fixes also the alert dialog popping up when deleting tasks in history.

Implementation

The alert dialogs weren't using vscode css styles. I added them.

Screenshots

How to Test

Settings Page: Change settings in the settings page and move click on another menu item like "prompts" without saving before.
Task History: Click on the delete icon of a task in the task history

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Important

Refactor alert dialog styles to use VS Code theme and improve button labels for better UX.

• Styles:
  • Updated alert dialog styles in alert-dialog.tsx to use VS Code theme colors and styles.
  • Changed dialog layout to have consistent spacing and alignment.
• Behavior:
  • Updated button labels in SettingsView.tsx from "Yes/No" to "Discard changes/Cancel" for clarity.
  • Fixed issue with alert dialog appearing when deleting tasks in history.
• Components:
  • Added AlertTriangle icon to AlertDialogTitle in SettingsView.tsx for visual emphasis.
  • Adjusted AlertDialogFooter layout in alert-dialog.tsx for better button alignment.

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[cte]

Thank you!