ui: Redesign the visualisation toolbar

[yomete]

Redesigned the visualisation toolbar and moved some buttons around.

• We renamed “More” to be “Preferences” and moved it to the right side of the toolbar
• Moved the Group by labels and Invert Call Stack buttons to be top level button on the toolbar
• Added a new Levels dropdown to be inside the Preferences dropdown.
• Moved most of the items in the original preferences modal dialog/settings page to now be in the dropdown.

[alwaysmeticulous]

✅ Meticulous spotted visual differences in 609 of 621 screens tested, but all differences have already been approved: view differences detected.

Meticulous evaluated ~4 hours of user flows against your PR.

_{Last updated for commit 124892e. This comment will update as new commits are pushed.}