feat: Route53 record mutations and change status tracking (M3.6 phase 2)

[nathanhuh]

Summary

Complete the remaining M3.6 Route53 milestone from PLAN.md. Phase 1 (read-only browsing) was implemented in #13 / PR #38. This issue covers the mutation and status tracking features.

Scope

Record Mutations

• Modify A / CNAME records (value, TTL)
• Create new DNS records
• Delete DNS records
• Type-to-confirm for destructive actions (delete) — follow updateRDSConfirm pattern

Change Status Tracking

• Show change status after mutations (PENDING → INSYNC)
• Poll for status updates using GetChange API
• Visual indicator for pending changes (similar to RDS polling pattern)

UI Polish

• Use lipgloss column-aligned styling for all Route53 views (see feat: Improve Route53 list views with column-aligned lipgloss styling #39)
• Color-code record types (A, CNAME, ALIAS, etc.)

Reference

• PLAN.md M3.6
• Existing patterns: RDS confirm dialog, RDS polling, context picker table styling