https://linear.app/unleash/issue/2-2703/align-with-ux
Timeline UI/UX improvements after sync with UX, including:
- Added some spacing between each event in the grouping tooltip
- Aligned the x events occurred header with filter dropdown
- Improved the strategy icon somewhat so it doesn't look as off center
- New timeline icon
- Improve icon position relative to timestamp on each event in the
grouping tooltip
- Changed text color in dropdowns to a lighter gray
- Removed bold formatting in tooltip
- Adjusted paddings and margins
- Added close button
- Added shadow
- Added left border
There are a few details missing, which will be tackled in separate PRs.

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Co-authored-by: Nuno Góis <github@nunogois.com>
https://linear.app/unleash/issue/2-2700/persist-timeline-state-in-local-storage
Implements persistent state management for the event timeline using
local storage.
I believe this improves UX by persisting both the timeline toggle
(visibility) state and applied filters across page refreshes.
Includes some scouting/refactoring and some workarounds to prevent the
timeline from animating on page load (in most cases).