v4.0.4-beta.1

Added

• Export dimensions dropdown — scale down recordings before saving (Original, 75%, 50%, 33%, 25%). Applied at export time; recordings always capture at full resolution.
• Estimated export file size — shows estimated output size in the video editor when trim, scale, or format change would affect the result.

Fixed

• Cursor flicker after finishing a stroke — the annotation cache is now incrementally updated on commit instead of rebuilt from scratch, eliminating the frame gap.
• Video editor bottom bar overlap — left-side info gracefully hides when the window is narrow instead of overlapping action buttons.
• Timeline thumbnail seams — sub-pixel gaps between thumbnail tiles eliminated with floor/ceil rounding.

Changed

• Video editor minimum width increased to 820px to ensure all controls fit.
• ~785 lines of dead code removed — identified by Periphery static analysis across 5 cleanup batches.