Improve log readability with Unicode symbols and indentation
- Replace underscore separators with Unicode box-drawing characters
- Add symbols for different log levels (✓ INFO, ⚠ WARNING, ✗ ERROR, etc.)
- Add contextual symbols for different panel types (▶ mentions, ◆ reasoning, ⚙ tools, ✎ posts)
- Indent panel content for better visual hierarchy
- Maintain --simple-logs compatibility for plain text format
- Use vertical bar separators in log timestamps for cleaner alignment
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Co-Authored-By: Claude <noreply@anthropic.com>