Add thread draft publishing

[Harrison-F]

Summary

• adds thread mode for kind 1 drafts/submissions using a ghostr-thread marker and threadPosts payload
• publishes submitted threads sequentially with NIP-10 root/reply tags and strips Ghostr-only tags
• adds publisher review/edit support for thread cards
• centralizes thread split/join helpers in src/lib/threadUtils.ts
• avoids pre-splitting regular notes that merely contain --- when switching into thread mode
• surfaces sequential publish progress and partial-publish failures in both submission publishing and direct publisher thread publishing
• keeps delegate submission notes visible to reviewers as private review metadata

Feedback addressed

• Mid-thread failure now reports how many posts went live before the error.
• Publish buttons show Publishing post N of M… during sequential publishing.
• Duplicate thread delimiter helpers were extracted into a shared util.
• Redundant re-splitting in PublishDialog was removed.
• Existing non-thread notes are no longer auto-split on thread mode switch; explicit split remains available through the split action.
• Direct publisher thread publishing now has the same partial-failure context as submission publishing.
• Delegate notes are restored in ReviewPane.

Test Plan

• git diff --check origin/main...HEAD
• npm run build

Notes

Rollback is not possible once a Nostr note is published, so partial thread failures now report which prefix of posts is already live.

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