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, 3 insertions, 1 deletions

diff --git a/apps/web/src/services/storage/migrations/index.ts b/apps/web/src/services/storage/migrations/index.ts
index cbc35bb3..f3f2a22c 100644
--- a/apps/web/src/services/storage/migrations/index.ts
+++ b/apps/web/src/services/storage/migrations/index.ts
@@ -30,10 +30,11 @@ import { V27toV28Migration } from "./v27-to-v28";
 import { V28toV29Migration } from "./v28-to-v29";
 import { V29toV30Migration } from "./v29-to-v30";
 import { V30toV31Migration } from "./v30-to-v31";
+import { V31toV32Migration } from "./v31-to-v32";
 export { runStorageMigrations } from "./runner";
 export type { MigrationProgress } from "./runner";
 
-export const CURRENT_PROJECT_VERSION = 31;
+export const CURRENT_PROJECT_VERSION = 32;
 
 export const migrations = [
 	new V0toV1Migration(),
@@ -67,4 +68,5 @@ export const migrations = [
 	new V28toV29Migration(),
 	new V29toV30Migration(),
 	new V30toV31Migration(),
+	new V31toV32Migration(),
 ];