[ dmnyc/ghostr ] Fix draft deletion sync across browsers
Track deleted draft IDs from relay to prevent deleted drafts from
reappearing when logging in from a different browser.
- loadDraftsNIP37 now returns { drafts, deletedIds }
- Empty content events are recognized as deletion markers
- mergeDrafts excludes drafts that were deleted on relay
- Deleted drafts are removed from local cache during sync

GitHub
Fix draft deletion sync across browsers · dmnyc/ghostr@335725d
Track deleted draft IDs from relay to prevent deleted drafts from
reappearing when logging in from a different browser.
- loadDraftsNIP37 now ...