fix(webapp): enforce keyboard interaction safeguards (#4702)

## Summary

Enable keyboard-event and static-element interaction safeguards across
the dashboard.

Earlier stack changes move actionable behavior to native controls. This
final enforcement keeps narrowly documented exceptions for focus
forwarding, scoped Escape handling, CodeMirror focus, and pointer-driven
table column resizing.

`jsx-a11y/no-autofocus` remains disabled.

Base: [#4701](https://github.com/triggerdotdev/trigger.dev/pull/4701)