`@remotion/promo-pages`: Improve Company License pricing section (#7062)

* `@remotion/promo-pages`: Improve Company License pricing section design

- Wrap Creators/Automators sections in bordered cards (solid when active, dashed when inactive)
- Move tooltip content inline as description text for better discoverability
- Add separator line above total price for clearer visual hierarchy
- Add "Total" label and tabular-nums for stable number layout
- Make SectionCheckbox row clickable

* `@remotion/design`, `@remotion/promo-pages`: Fix a11y for pricing toggles and sliders

- Switch: change div to button with role="switch" and aria-checked
- Add aria-label to Switch and PricingSlider components
- Add inert to collapsed sections so hidden sliders don't receive focus

* `@remotion/promo-pages`: Remove unused InfoTooltip component

* Revert bordered cards and separator line

Remove the bordered card wrappers around Creators/Automators
sections and the separator line above total price, while
keeping other improvements (inline descriptions, Total label,
tabular-nums, clickable rows, aria-labels).

Made-with: Cursor

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Co-authored-by: Jonny Burger <jonathanburger11@gmail.com>