Add user-configurable timezone and 12/24-hour preferences, then wire them through settings, runtime snapshots, scheduler payloads, wait handling, notifications, backups, memory, plugin metadata, and frontend formatters.
Keep UTC as the boundary for absolute instants while serializing user-facing dates in the configured or browser-resolved timezone. Preserve scheduler wall-clock inputs in the selected timezone, propagate TZ into desktop/runtime process environments, and restart active desktop sessions when the runtime timezone changes.
Cover the risky paths with timezone regression tests for settings normalization, auto and fixed timezone resolution, scheduler round-trips, memory timestamp conversion, and desktop timezone sync.
Detect stalled automatic history compression so the prompt-prep wait loop cannot spin forever when no further reduction is possible.
Split large manual chat compaction input by verified token budget instead of line midpoint, covering single-line 85k+ character histories.
Add regression tests for stalled compression, max-pass bailout, and large single-line compaction chunking.
