feat: add clear queue button to complete message queueing feature

[Copilot]

Message queueing was already ~80% implemented — users could queue messages while the agent was busy, see them in the timeline with a "Queued" badge, and have them auto-send in order. The one missing acceptance criterion: no way to cancel queued messages before they sent.

What Changed

• onClearQueue handler — revokes blob preview URLs for queued optimistic messages, then removes them from optimisticUserMessages and clears queuedMessages
• "X queued" indicator → cancel button — the static text label is now a button with a × icon; turns destructive red on hover; calls onClearQueue on click

Why

Completing the last unimplemented acceptance criterion from the queueing feature: "Queue can be cancelled/cleared before messages are sent." Without this, queued messages were committed with no escape hatch.

UI Changes

Before: 2 queued (plain text, non-interactive)

After: 2 queued × (button, hovering turns red, clicking clears all queued messages and removes their optimistic timeline entries)

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

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Project	Deployment	Actions	Updated (UTC)
okcode-marketing	Ready	Preview	Mar 31, 2026 9:56pm