Add virtualization via Headless UI's virtual prop

[charliepark]

Headless UI added a virtual prop to easily enable virtualization, so we're using that here to virtualize our combobox lists. Scrolling in Chrome definitely feels smoother.

For manual testing, the other-project project has a lot of existing disks, so going to http://localhost:4000/projects/other-project/instances-new and setting the boot disk to the existing disks tab will get you a dropdown with a lot of disks

[vercel]

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Project	Deployment	Actions	Updated (UTC)
console	Ready	Preview	May 29, 2026 4:59am

[david-crespo]

Tested it in Firefox on the snapshot create form by making all 1000 disks in other-project snapshottable (see diff below). HUGE difference. With this change, the combobox opens instantly and filters instantly. Without it, the list takes a good second or two to open and just as long to filter when you type. Very nice.

The only issue I ran into is almost definitely fine: when I scroll as fast as I can through the list, it occasionally hits a wall and stops scrolling, presumably because it's hitting the limit of what is currently rendered. But I am scrolling really, really fast to get this.

diff --git a/app/api/util.ts b/app/api/util.ts
index f3091f865c..e0c437df75 100644
--- a/app/api/util.ts
+++ b/app/api/util.ts
@@ -225,6 +225,7 @@
   | Pick<Disk, 'state' | 'diskType' | 'readOnly'>
   | { state: DiskState; disk_type: DiskType; read_only: boolean }
 const canSnapshot = (d: SnapshotDisk) => {
+  return true
   const diskType = 'diskType' in d ? d.diskType : d.disk_type
   const readOnly = 'readOnly' in d ? d.readOnly : d.read_only
   return (