Timeline fixes and export handles

[hawkeye217]

• Fix tap events on mobile - specifically on the motion review timeline, having every segment clickable/tappable would interfere with scrolling
• Slightly adjust some colors
• Prevent timeline elements from falsely triggering things on mobile
• Implement timeline export handles (see example in playground - enable the bars, drag, then click Export)
• Revamp draggable element hook to be more generic
• Remove unneeded code and rename useEventUtils hook to useTimelineUtils
• Remove commas in tailwind color vars
• Probably other small cool things that I forgot

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