chore: add draftlog for issue #5616 fix

Author: yqtian-se

draftlogs/5616_fix.md

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+## Fix colorbar editType for map traces
+
+### Bug
+Setting `marker.colorbar` properties (e.g., `tickfont.textcase='normal'`) during scattermap/scattergeo/scattermapbox initialization would cause the map to blank on initial render.
+
+### Root Cause
+Map traces had `marker.colorbar` properties with `editType='calc'` instead of `editType='colorbars'`. This caused the entire plot to recalculate on colorbar property changes, breaking map rendering during initialization.
+
+### Fix
+- Added `restoreColorbarEditTypes()` function to restore correct editType for all colorbar properties
+- Applied to scattermap, scattergeo, and scattermapbox trace types
+- Regenerated test/plot-schema.json with corrected editTypes
+
+### Impact
+- Fixes #5616: Scattermap no longer blanks when colorbar properties are set on initial render
+- Brings map trace behavior in line with non-map traces like scatter
+- No breaking changes, full backward compatibility