Fix tooltip icon z-index below form footer

[Copilot]

Summary

Tooltip icons in LabeledSelect and other form components were rendering behind the CruResourceFooter when windows were collapsed, obscuring critical UI hints.

Occurred changes and/or fixed issues

• Added tooltipIcon: 20 to z-index hierarchy in _variables.scss
• Updated LabeledTooltip component to use new constant instead of hoverOverContent (z-index 3)
• Tooltip icons now render above footer (z-index 19) but below modals/overlays (z-index 51+)

Technical notes summary

Previous z-index of 3 (hoverOverContent) placed tooltip icons below most UI chrome. New value of 20 positions them correctly in the visual hierarchy between footer and modal layers.

Affected components using LabeledTooltip:

• LabeledSelect
• Select
• KeyValue
• LabeledInput

Areas or cases that should be tested

• Navigate to local cluster → Apps → Charts → Rancher Backup
• Collapse browser window height so footer overlaps with "Install into Project" field
• Verify tooltip icon appears above footer, not behind it
• Test with both light and dark themes
• Verify tooltip icons in other form components (LabeledInput, Select, KeyValue) still render correctly

Areas which could experience regressions

• Components using LabeledTooltip in forms with sticky/fixed footers
• Tooltip positioning in modals or overlays (should remain unchanged, modals are z-index 53+)
• Tooltip icons near table headers (z-index 11) or main header (z-index 14)

Screenshot/Video

Before: Tooltip icon hidden behind footer when window collapsed
After: Tooltip icon visible above footer

Checklist

• The PR is linked to an issue and the linked issue has a Milestone, or no issue is needed
• The PR has a Milestone
• The PR template has been filled out
• The PR has been self reviewed
• The PR has a reviewer assigned
• The PR has automated tests or clear instructions for manual tests and the linked issue has appropriate QA labels, or tests are not needed
• The PR has reviewed with UX and tested in light and dark mode, or there are no UX changes
• The PR has been reviewed in terms of Accessibility
• The PR has considered, and if applicable tested with, the three Global Roles Admin, Standard User and User Base

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Original prompt

---

This section details on the original issue you should resolve

<issue_title>Select component's tooltip icon appears above form footer</issue_title>
<issue_description><!--------- For bugs and general issues --------->
Setup

• Rancher version: 2.9

Describe the bug

• LabelSelect tootlip appears above crufooter

To Reproduce

• Nav to local cluster (this is important) --> Clusters --> Tools --> Rancher Backup (only visible in local cluster)
• Collapse the height of the window such that the foot with 'next' in abboves over the Install into Project select component

Result

Expected Result

• tooltip icon goes under the footer

Additional context

• Not vue3 related, reproducible in 2.9
  </issue_description>

<agent_instructions>Make sure the fixes comment in the PR references issue 12302</agent_instructions>

Comments on the Issue (you are @copilot in this section)

@codyrancher Closing, as of 2.13 this is no longer an issue.

https://github.com/user-attachments/assets/69ef9459-8239-45bd-817e-29770134c63f</comment_new>
<comment_new>@richard-cox
This one is still reproducible. Note that it's the labelledselect component. Interestingly we no longer show the same disabled project input field for installed charts, but it is reproducible elsewhere

</comment_new>

• Fixes Select component's tooltip icon appears above form footer #12302

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