Cannot select recurrence option with keyboard

Where did this happen?

Local code with an up-to-date main branch, Hosted (app.compasscalendar.com)

Expected Behavior

When changing a recurring event from the week view, Compass prompts the user to select between applying this change to This Event, This and Following Events, and All Events, in addition to cancelling the change.

When the user is presented with these options, they should be able to select the desired option using just their keyboard by typing TAB, SHIFT+TAB, SPACE, and ENTER.

The option that is currently selected (focused) should also have different styles, so that the user can identify which option they have selected. This also applies to when the user has focused on the Cancel / Save button.

Current Behavior

When the user is presented with these options and attempts to use their keyboard to make a selection, nothing happens

<img width="831" height="650" alt="Image" src="https://github.com/user-attachments/assets/0a03e30f-1019-4fb9-97b6-22de91509723" />

Steps to Reproduce

1. Create a recurring event
2. Click save from the form
3. The modal will appear
4. Try typing TAB or ENTER
5. Nothing will happen

Possible Solution

No response

Context

When fixing, ensure to

• re-use existing tailwind styles for the focus color (reference the day view)
• use floating-ui for the modal pattern. They have a11y built-in
• Write tests to protect this a11y use-case and ensure we don't regress
• Use the axe DevTools Chrome extension or similar to audit your changes

<!-- upstream-issue: SwitchbackTech/compass#1326 -->