chore(ui): replace ArrowUUpLeft with PencilSimple icon in queued message

[MattPua]

Problem

The queued message view was using a non intuitive icon (ArrowUUpLeft) for the "return to editor" action. A pencil icon better represents the editing action.

Changes

Before

After:

• Replaced ArrowUUpLeft icon import with PencilSimple from @phosphor-icons/react
• Updated the icon rendered in the queued message editor button from <ArrowUUpLeft size={12} /> to <PencilSimple size={12} />
• The button's tooltip and functionality remain unchanged ("Return to editor")

How did you test this?

Visual inspection of the icon change in the queued message component.

Automatic notifications

• Publish to changelog?
• Alert Sales and Marketing teams?

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Created with PostHog Code

[trunk-io]

😎 Merged manually by @MattPua - details.

[github-actions]

React Doctor found no issues in the changed files. 🎉

_{Reviewed by React Doctor for commit 7ce5536.}

[greptile-apps]

_{Reviews (1): Last reviewed commit: "fix(ui): replace ArrowUUpLeft with Penci..." | Re-trigger Greptile}

[github-actions]

Trivial icon substitution in a UI component — no logic, API, or data model changes.