Update `Lookup` for SLDS2

[msmx-mnakagawa]

What I did

• Lookup
  • update markups significantly
  • improve a11y
• Spinner
  • add a layout prop
  • add an x-small size
• Icon
  • add an xx-small size

Reference

https://v1.lightningdesignsystem.com/components/lookups/

[reg-suit[bot]]

reg-suit detected visual differences.

Check this report, and review them.

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What do the circles mean?

The number of circles represent the number of changed images.
:red_circle: : Changed items, :white_circle: : New items, :black_circle: : Deleted items, and :large_blue_circle: Passed items

How can I change the check status?

If reviewers approve this PR, the reg context status will be green automatically.

[msmx-mnakagawa]

@stomita

Too small icon and maybe bigger down icon of scope dropdown button, comparing to the standard multi-scope lookup

I've tried to tweak the layout as below. Could you confirm again...?

[msmx-mnakagawa]

@stomita

Scope dropdown of lookup should be keyboard navigatable (by up/down arrow, return key, esc key, and so on), like current dropdown button implementation.

I've tried to add keyboard handlers, so could you take a look again...?

[msmx-mnakagawa]

FYI, I've removed aria-labelledby in 5edc2d88, reflecting https://github.com/mashmatrix/react-lightning-design-system/pull/472#discussion_r2156145801.

[msmx-mnakagawa]

@stomita Thank you for your confirmation. I've tried to fix listHeader and listFooter in 74368a5.

[msmx-mnakagawa]

@stomita Thank you for your confirmation, and I'm sorry for my lack of confirmation...

As shown below, I tried to apply the disabled style in d15c4ec.