Add Confirmation Dialog System

[google-labs-jules]

Implemented a global Confirmation Dialog system to replace native window.confirm.

Changes:

• Created web/contexts/ConfirmContext.tsx exposing a useConfirm hook.
• Created web/components/ui/ConfirmDialog.tsx with dual-theme support (Glassmorphism & Neobrutalism) and accessibility features (focus management, ARIA roles).
• Integrated ConfirmProvider in web/App.tsx.
• Refactored web/pages/GroupDetails.tsx to use useConfirm for destructive actions (Delete Group, Delete Expense, Leave Group, Remove Member).

Verification:

• Verified with Playwright automated tests (interaction, visibility, API interception).
• Verified dual-theme consistency.
• Updated tracking files.

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PR created automatically by Jules for task 10059190214259524718 started by @Devasy23

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