Regression(Select): floating content components lost

Describe the bug

Select.Content has overflow-y-auto but no max-height, so it grows to the full height of its item list instead of being capped to the available viewport space. With a long list the popover runs past the bottom of the window.

Nothing scrolls it back. scrollHeight === clientHeight on the content, so overflow-y-auto never engages and the viewport inside it is never compressed, which also means SelectScrollUpButton and SelectScrollDownButton can never appear. Items below the fold are unreachable by wheel and by keyboard, and since the content is position: fixed the page cannot scroll to them either.

bits-ui publishes the value needed to bound it, on that same element. It is never read:

--bits-select-content-available-height: 764px;

max-width is none for the same reason, so long item labels also push the content wider than the window.

Bisect. select-content.svelte:

dropdown-menu-content.svelte lost max-h-(--bits-dropdown-menu-content-available-height) in the same commit. As of today no floating content component in the nova style declares a max-h: select, dropdown-menu, popover, context-menu, menubar.

Expected. Content capped to the available viewport height and scrolling internally, as it did before #2471.

I intend to submit a PR: restore max-h-(--bits-<name>-content-available-height) on the content class of each of those five components. Happy to scope it to select alone if you prefer a narrower change.

Reproduction

https://github.com/imlargo/bug-repro

Open the select. Measured on [data-slot="select-content"] at viewport 1280x800:

Logs

No console or server output. The failure is purely layout.

System Info

System:
    OS: macOS 26.3.1
    CPU: (8) arm64 Apple M3
    Memory: 164.61 MB / 16.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 25.6.1 - /opt/homebrew/bin/node
    npm: 11.9.0 - /opt/homebrew/bin/npm
    pnpm: 10.29.2 - /opt/homebrew/bin/pnpm
    bun: 1.3.9 - /Users/imlargo/.bun/bin/bun
  Browsers:
    Chrome: 152.0.7977.83
    Safari: 26.3.1
  npmPackages:
    @lucide/svelte: ^1.43.0 => 1.43.0
    @sveltejs/kit: ^2.63.0 => 2.70.3
    bits-ui: ^2.19.2 => 2.19.2
    shadcn-svelte: ^1.6.1 => 1.6.1
    svelte: ^5.56.1 => 5.57.0
    tailwindcss: ^4.3.0 => 4.3.3

Severity

annoyance