fix(Dropdown): keep items at full height when the menu scrolls

[ariser]

Description

• Dropdown.Item now has flex-shrink: 0, so it keeps its full height when the menu is taller than the space available. The menu scrolls instead.
• Cause: the content panel is a flex column (display: flex from GenericMenuPanel, flex-direction: column from .dropdown-menu-content) with max-height: var(--radix-dropdown-menu-content-available-height) and overflow-y: auto. The items kept the default flex-shrink: 1, so items taller than one line (for example with a description) shrank toward their 32px min-height before the panel started to scroll.

Links and tickets

CUI-324. History: #535 (for #533, long lists) added min-height: 32px to Dropdown.Item "to make sure it does not get compressed". That was the same shrinking: the minimum only stops the items at 32px. This PR removes the cause.

Good to know

• Select does not have this problem: its options sit inside a block element with overflow: auto, and that element is the flex item, so the options are not flex items. Wrapping the Dropdown items in the same way was an alternative; this PR uses the smaller change.
• Items that fit the menu look the same as before. The change is visible only when the menu has to scroll.

Tests

No unit test: this is layout, and jsdom does no layout. No new visual test case was added.

Checklist

• Breaking changes? (add migration notes in changesets)
• Visual changes? (specify in changesets)
• Design review needed?

Contribution

• Sufficient research before PR
• Self-reviewed the PR
• Manually tested the changes (when applies - visual confirmation in Storybook)
• build and build-storybook work locally
• Tests and Stories are aligned with the changes

Accessibility

Skipped: no markup, behavior or ARIA changed. One layout declaration was added.

Screenshots

TODO: before/after of a scrolling menu with multi-line items.

🤖 Generated with Claude Code

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🦋 Changeset detected

Latest commit: 15334da

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@clickhouse/click-ui	Patch

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