fix: remove missing resize event listener cleanup and fix copy button aria-label

[immanuwell]

Description

Two bugs fixed:

1. window.addEventListener('resize', updatePageSize) was called inside useEffect without a cleanup in 5 components. Every time deps changed (page, alignment, data), a new listener piled on top. On a busy session that's a real leak - stale handlers keep firing and updating state on unmounted components.

2. The copy-token IconButton in developer/tokens had aria-label="delete" - copy-paste error, screen readers called it "delete".

Related Issue

No open issue found for these.

Motivation and Context

Fix 1: added return () => window.removeEventListener('resize', updatePageSize) in each effect. For schedulers/seed-peers where updatePageSize was scoped inside if (alignment === 'card'), moved it one level up so it's reachable from the cleanup (calling removeEventListener on a never-registered listener is a safe no-op).

Fix 2: changed aria-label="delete" to aria-label="copy".

How to reproduce

Leak: open the clusters or schedulers page in card view, resize the window, then navigate away and back a few times. Each render cycle adds another resize handler with no cleanup.

Aria label: inspect the copy-token button with devtools or a screen reader - it was announced as "delete".

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Checklist

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.