This commit makes drafts persistent.
It does so by:
1. Converting `DraftsArtifacts` into Nostr events
2. Wrapping those Nostr events into NIP-37 notes
3. Saving those NIP-37 notes into NostrDB
4. Loading those same notes at startup
5. Unwrapping NIP-37 notes into Nostr events
6. Parsing that into `DraftsArtifacts`, loaded into DamusState
7. PostView can then load these drafts
Furthermore, a UX indicator was added to show when a draft has been
saved.
Limitations:
1. No encoding/decoding roundtrip guarantees. That would require
extensive and heavy refactoring which is out of the scope of this
commit.
2. We rely on `UserSettings` to keep track of note ids, while we do not
have Ndb query capabilities
3. No NIP-37 relay sync support has been added yet, as that adds
important privacy and sync conflict considerations which are out of
the scope of this ticket, which is ensuring people don't lose their
progress while writing notes.
4. The main use cases and scenarios have been tested. Because of (1),
there may be some small inconsistencies on the stored version of the
draft, but care was taken to keep the substantial portions of the
content intact.
Closes: https://github.com/damus-io/damus/issues/1862
Changelog-Added: Added local persistence of note drafts
Signed-off-by: Daniel D’Aquino <daniel@daquino.me>
