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Browser timezone is now synced to user_settings["user_timezone"] on every login/page load (App.vue). The briefing scheduler and LLM context both read from this single source, falling back to the legacy briefing_config.timezone for existing users during migration. - App.vue: PUT /api/settings with browser IANA timezone on startAppServices - routes/chat.py: fall back to stored user_timezone when not sent in request - briefing_scheduler: read user_timezone setting; briefing_config.timezone kept as fallback only - routes/briefing.py: pass tz_override from user_timezone to live-patched scheduler - Remove timezone field from BriefingConfig interface and all briefing UI Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>