Output/Log panel API

Current State

The editor has no dedicated output or log panel. Engine/editor log output goes to stdout/stderr only, with no filtering, categorization, or rich display in-editor.

Tasks:

• Design the log/output API (log levels, categories, structured entries)
• Implement log entry types (Info, Warning, Error, Debug)
• Implement filtering by log level, category, and text search
• Implement "merge repetitions" (collapse repeated identical messages with a count)
• Implement file:line linking (clickable references that open the source file)
• Implement brief/expanded view toggle for log entries
• Implement stack trace display for errors
• Build the Output Panel UI (dockable, clear, auto-scroll, copy)
• Support log coloring by type/level

Acceptance Criteria:

• Output Panel shows all engine/editor log messages in a dockable panel
• Messages are filterable by level (Info/Warning/Error/Debug)
• Repeated identical messages are collapsed with a repetition counter
• File:line references in log messages are clickable and open in the source editor
• Stack traces are displayed for error entries
• Brief/expanded toggle per entry
• Log can be cleared and copied
• Colors distinguish log levels

Related: