feat: single-file project import/export (.ocp)

fflate zip container: project.json (serialized project incl. schema
version) + media files with a manifest. Export gathers all project
media (missing blobs warn, never abort) after save-flush; import
validates everything before any write, migrates older archives through
the storage migration registry, remaps media ids, and creates a new
project with rollback on failure. Entry points: projects page
import/export, editor header menu, export-project-archive action.
29 tests incl. full round-trip.

1 files changed, 16 insertions, 0 deletions

diff --git a/apps/web/src/project/transfer/index.ts b/apps/web/src/project/transfer/index.ts
new file mode 100644
index 00000000..81d97a6a
--- /dev/null
+++ b/apps/web/src/project/transfer/index.ts
@@ -0,0 +1,16 @@
+export {
+	PROJECT_ARCHIVE_EXTENSION,
+	ProjectArchiveError,
+} from "./container";
+export type {
+	ArchivedMediaEntry,
+	ArchivedMediaMetadata,
+} from "./container";
+export {
+	exportProjectArchive,
+	importProjectArchive,
+} from "./archive";
+export type {
+	ExportProjectArchiveResult,
+	ImportProjectArchiveResult,
+} from "./archive";