refactor(ui): reuse icon button for chat file removal

[BillLeoutsakosvl346]

Summary

• Use the existing EMCN 20px icon button treatment for the floating chat attachment remove action in place of its local 16px sizing.
• Reveal the action on keyboard focus as well as hover. Keep its corner placement, accessible label, remove callback, and propagation handling.

Type of Change

• Improvement

Testing

• bun run lint, bun run lint:check, bun run type-check, bun run check:audits (47 audits), bun run docs-manifest:check, and bun run apps/sim/scripts/check-block-registry.ts origin/staging passed.
• packages/emcn: bun run test (349 tests) passed.
• Matched light/dark rest, hover, and keyboard focus screenshots plus click and propagation checks in an equivalent fixture using the actual EMCN Button, X icon, product font, and product CSS.
• Full conformance scan on staging fell from 891 to 889 findings, with the two targeted overrides removed and none added. The committed PR diff linter reported no findings.

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Relevant tests pass
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

[vercel]

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1 Skipped Deployment

Project	Deployment	Actions	Updated
docs	Skipped		Sep 23, 2026 12:46am UTC

[BillLeoutsakosvl346]

Matched before/after comparisons for the floating chat attachment remove action. Equivalent fixture with actual EMCN Button and X icon, product font and CSS, and synthetic files. The target grows from 16px to 20px; hover reveal and remove behavior remain. Keyboard focus now reveals the control.

Light theme, image hover:

Dark theme, image hover:

Document hover:

Keyboard focus on image removal:

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge, with no actionable correctness, accessibility, security, or repository-rule violations identified.

Summary

This PR standardizes the chat attachment removal control on the existing EMCN icon-button treatment.

• Replaces local 16px button sizing with the shared 20px icon size.
• Reveals the removal action on keyboard focus as well as hover.
• Preserves the accessible label, removal callback, and click-propagation handling.

_{Reviews (1) · Last reviewed commit: "refactor(ui): reuse icon button for chat..."}

[cubic-dev-ai]

No issues found across 1 file

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Re-trigger cubic}