[explorer] make explorer ui more kumo compatible

[emily-shen]

1. use phosphor-icons
2. use tailwind css

these are both used by kumo and lays the foundation for migrating to kumo.

---

• Tests
  • Tests included/updated
  • Automated tests not possible - manual testing has been completed as follows: had a look at the ui and it looks the same as before
  • Additional testing not necessary because:
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: wip experimental

A picture of a cute animal (not mandatory, but encouraged)

[changeset-bot]

⚠️ No Changeset found

Latest commit: cd2e199

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 4 additional findings.

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commit: cd2e199

[devin-ai-integration]

Devin Review found 1 new potential issue.

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