feat(frontend/builder): add confirmation dialog for workspace file removal

[Abhi1992002]

Summary

• Add a confirmation dialog when users remove a workspace-uploaded file from a file input in the builder
• File deletion from workspace is non-reversible, so users must confirm before proceeding
• Only applies to workspace upload mode (onDeleteFile provided); base64/local mode clears immediately as before
• Uses the existing Dialog molecule with "Remove file" title, cancel/remove buttons
• Works for both default and compact FileInput variants

Changes

• FileInput.tsx: Added showDeleteConfirm state, requestClear() gate function, and a reusable deleteConfirmDialog element rendered in both variant branches

Test plan

• Upload a file in workspace mode in the builder, click the remove/trash button — confirm dialog appears
• Click "Cancel" — dialog closes, file remains
• Click "Remove" — file is deleted from workspace and cleared from input
• Upload a file in base64 mode — clicking remove should clear immediately with no dialog
• Test both default and compact FileInput variants

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• Create PR with unit tests
• Commit unit tests in branch feat/file-input-remove-confirmation

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