Update chrono-node from 2.9.1 to 2.10.1

[Amato21]

Summary

Dependency update. Our own parser (parser.ts) only falls back to chrono-node for expressions it doesn't have dedicated regex handling for, so upstream locale fixes land automatically for anything routed through that fallback.

Relevant upstream changes for languages we support (verified against the actual chrono-node release notes for 2.9.2/2.10.0/2.10.1, not just the changelog summary):

• fr: standard month name abbreviations + accented variants (e.g. "15 déc. 2026")
• it: new relative-time and timezone-offset support
• de/fr/it: casual-time meridiem preserved when merged with an explicit time
• uk: fixed a forwardDate regex missing the unicode flag
• zh: past-tense relative expressions (e.g. "1小时前")
• DST resolution now based on UTC instead of system time (all languages)

No breaking changes upstream.

Verification

• Smoke-tested the French/Italian fixes directly against chrono-node to confirm they're reachable through our fallback path.
• 723/723 tests passing (unchanged — this is a dependency bump, not a behavior change on our side), tsc, eslint, and npm run build all clean.
• Bonus: the pre-existing "circular dependency" build warning for the Italian locale is gone, likely a side effect of chrono-node 2.10.0's package restructuring.

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