Support copying and deleting old-format bookmarks

[SnowCait]

Summary

• Copy all public and private old-format bookmarks into the standard kind: 10003 bookmark list.
• Preserve the old-format event during copy, including its encrypted content.
• Add an independent NIP-09 deletion request for 30001:<pubkey>:bookmark using a and k tags.
• Hide old-format bookmarks and clear their local cache only after at least one relay accepts the deletion request.
• Add English and Japanese UI copy, confirmation, progress states, and result notifications.

Validation

• npm test — 31 test files, 314 tests passed
• npm run check — 0 errors and 0 warnings
• npm run lint — passed
• npm run build — passed

Closes #2309

Parent: #2282

[cloudflare-workers-and-pages]

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	nostter	923bfd9	Commit Preview URL Branch Preview URL	Aug 19 2026, 04:48 PM