feat(icons): migration to phosphor icons

[hazre]

Description

Fixes #

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

AI disclosure:

• Partially AI assisted (clarify which code was AI assisted and briefly explain what it does).
• Fully AI generated (explain what all the generated code does in moderate detail).

[github-actions]

⚠️ Missing changeset

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How to add a changeset:

1. Run pnpm run document-change (interactive) and commit the generated file, or
2. Manually create .changeset/<descriptive-name>.md:

---
default: patch
---

Short user-facing summary of the change.

Replace patch with major, minor, patch, docs, or note as appropriate.

📖 Read more in CONTRIBUTING.md.

If this PR is internal/maintenance with no user-facing impact, a maintainer can add the internal label to skip this check.

[github-actions]

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Status	Preview URL	Commit	Alias	Updated (UTC)
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