feat: git-like project versioning (v1)

Linear per-project history per notes/project-versioning.md: named
checkpoints (thumbnail via renderer.captureFrame) plus auto-checkpoints
on save (60s throttle, ring of 20, named never rotate). Restore writes a
safety checkpoint first, then swaps the document outside undo/redo.
Media assets referenced by any version are pinned against deletion.
Migration v31-v32 stamps the schema; the version store lives in its own
IDB database with an in-memory fallback for tests. Versions popover in
the editor header for jump/rename/delete. 12 new tests.

1 files changed, 13 insertions, 0 deletions

diff --git a/apps/web/src/versions/index.ts b/apps/web/src/versions/index.ts
new file mode 100644
index 00000000..e9f69841
--- /dev/null
+++ b/apps/web/src/versions/index.ts
@@ -0,0 +1,13 @@
+export type { ProjectVersion, ProjectVersionKind } from "./types";
+export type { VersionStore } from "./store";
+export {
+	InMemoryVersionStore,
+	IndexedDBVersionStore,
+} from "./store";
+export { getReferencedMediaIds } from "./media-references";
+export {
+	AUTO_CHECKPOINT_MIN_INTERVAL_MS,
+	AUTO_CHECKPOINT_RETENTION,
+	VersionsManager,
+} from "./versions-manager";
+export { useVersionsStore } from "./versions-store";