fix(filters): use local time for date ranges

Summary

The time filter in Logs used UTC, while log timestamps were displayed in local time. This forced users to convert between local time and UTC whenever they filtered logs, which was confusing.

Testing

- `npm run lint` - `npm test -- --watch=false` - `npm run build` - Manually verified using America/Montevideo.

AI disclosure: OpenAI Codex assisted with investigation and implementation. I reviewed and tested the changes.

• I am respecting Sentry's proprietary Business Source License (BSL) by implementing code in a clean room environment. I have not read any BSL Sentry code. It is OK to read MIT licensed code.