Improve timeline ruler and bars
Starting a draft to improve the timeline ruler and bars visuals. The changes include:
Increasing the size of the time zone.
Move the new effect zone bar above the ruler.
Move the render zone bar above the effect zone bar.
Move marker guides from timeline to above render zone bar.
Add resize handles and move marker (square) to the bars and make them only appear on mouse hover.
Add more categories to guides and change colors.
Guide color proposal (based on breeze):