[Controls] Small visual fixes

[mbondyra]

Summary

Fixes #221140
Fixes #223579

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🏷️ Long labels no longer truncated

Label truncation was introduced sometime between versions 8.14 and 8.18:

8.14 (working):

8.18 (broken):

✅ After the fix:

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🎛️ [Controls] Options list hover background fix

The original hover style comes from EUI. Removing it entirely made the interaction feel unclear,
so I’ve reintroduced a lighter background to subtly indicate the hover state:

9.0 (broken):

✅ After the fix:

[elasticmachine]

Pinging @elastic/kibana-presentation (Team:Presentation)

[elasticmachine]

💚 Build Succeeded

• Buildkite Build
• Commit: 90d1384

Metrics [docs]

Async chunks

Total size of all lazy-loaded chunks that will be downloaded as the user navigates the app

id	before	after	diff
controls	470.3KB	470.2KB	-20.0B

[ThomThomson]

Changes LGTM! Looked through the code and ran locally, nice small cleanup!

[kibanamachine]

Starting backport for target branches: 8.19

https://github.com/elastic/kibana/actions/runs/15905805775

[kibanamachine]

💔 All backports failed

Status	Branch	Result
❌	8.19	Backport failed because of merge conflicts You might need to backport the following PRs to 8.19: - [Controls] migrate scss to emotion (#216413)

Manual backport

To create the backport manually run:

node scripts/backport --pr 225430

Questions ?

Please refer to the Backport tool documentation

[kibanamachine]

Friendly reminder: Looks like this PR hasn’t been backported yet.
To create automatically backports add a backport:* label or prevent reminders by adding the backport:skip label.
You can also create backports manually by running node scripts/backport --pr 225430 locally
cc: @mbondyra

[kibanamachine]

Friendly reminder: Looks like this PR hasn’t been backported yet.
To create automatically backports add a backport:* label or prevent reminders by adding the backport:skip label.
You can also create backports manually by running node scripts/backport --pr 225430 locally
cc: @mbondyra

[kibanamachine]

Friendly reminder: Looks like this PR hasn’t been backported yet.
To create automatically backports add a backport:* label or prevent reminders by adding the backport:skip label.
You can also create backports manually by running node scripts/backport --pr 225430 locally
cc: @mbondyra

[kibanamachine]

Friendly reminder: Looks like this PR hasn’t been backported yet.
To create automatically backports add a backport:* label or prevent reminders by adding the backport:skip label.
You can also create backports manually by running node scripts/backport --pr 225430 locally
cc: @mbondyra

[kibanamachine]

Friendly reminder: Looks like this PR hasn’t been backported yet.
To create automatically backports add a backport:* label or prevent reminders by adding the backport:skip label.
You can also create backports manually by running node scripts/backport --pr 225430 locally
cc: @mbondyra

[ThomThomson]

@mbondyra I've removed the 8.19 backport label from this, as it seems like it won't be backported.

[kibanamachine]

Friendly reminder: Looks like this PR hasn’t been backported yet.
To create automatically backports add a backport:* label or prevent reminders by adding the backport:skip label.
You can also create backports manually by running node scripts/backport --pr 225430 locally
cc: @mbondyra