Upgrade all web/default dependencies to their latest versions and refresh the Bun lockfile. Add dependency overrides for vulnerable transitive packages so bun audit reports no known vulnerabilities.
Update TypeScript configuration for TypeScript 6 by removing deprecated baseUrl usage and explicitly enabling Node types where needed. Adapt the calendar component to react-day-picker v10 by replacing the removed table class key with month_grid.
Validation:
- bun outdated: no outdated dependencies
- bun audit: no vulnerabilities found
- bun run typecheck: passed
- bun run build: passed
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