feat(ui): US-22 becomes a side-effect-free draft correction; add US-24 S3 deletion

US-22: the PocketBase UI edits one field at a time with no preview of
the final name, so a field edit now persists the values with no template
evaluation, no re-filing and no status change; the corrected event carries
the field diff alone. The full correction (all fields, dry-run, re-filing,
validation) moves to the custom dashboard (US-3x).
US-24: deleting a documents record deletes the S3 object at file_key first;
the cascade delete removes the history. Spec, hooks, E2E updated together.

archivist/main.go

@@ -121,7 +121,7 @@ func main() {
 		app.Logger().Warn(s3.StartupWarning, "bucket", envCfg.S3Bucket)
 	}
 
-	// US-22 / US-23 / US-04: request hooks on documents and document_events.
+	// US-04 / US-22 / US-23 / US-24: request hooks on documents and document_events.
 	pbapp.BindHooks(app, cfg, s3)
 
 	// Manual poll pass: a superuser-only route used by the E2E gate and the