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, 14 insertions, 0 deletions

diff --git a/apps/web/src/services/storage/migrations/v31-to-v32.ts b/apps/web/src/services/storage/migrations/v31-to-v32.ts
new file mode 100644
index 00000000..0b6da324
--- /dev/null
+++ b/apps/web/src/services/storage/migrations/v31-to-v32.ts
@@ -0,0 +1,14 @@
+import { StorageMigration, type StorageMigrationRunArgs } from "./base";
+import type { MigrationResult, ProjectRecord } from "./transformers/types";
+import { transformProjectV31ToV32 } from "./transformers/v31-to-v32";
+
+export class V31toV32Migration extends StorageMigration {
+	from = 31;
+	to = 32;
+
+	async run({
+		project,
+	}: StorageMigrationRunArgs): Promise<MigrationResult<ProjectRecord>> {
+		return transformProjectV31ToV32({ project });
+	}
+}