feat(desktop): group projects into folders in the v2 sidebar

apps/desktop/src/renderer/lib/persisted-keys/persisted-key-registry.test-data.ts

@@ -12,6 +12,7 @@ export const PERSISTED_KEY_REGISTRY: ReadonlyArray<
 			"v2-workspace-local-state-*",
 			"v2-sidebar-projects-*",
 			"v2-sidebar-sections-*",
+			"v2-sidebar-collections-*",
 			"v2-terminal-presets-*",
 			"v2-user-preferences-*",
 			"failed-workspace-creates-*",

apps/desktop/src/renderer/lib/persisted-keys/persisted-keys.ts

@@ -39,6 +39,9 @@ export const DEAD_KEYS: DeadKey[] = [
 	{ key: "v2-available-banner-v1", match: "exact" },
 	// Bumped to v2 so updated clients republish a full 30-day leaderboard window
 	{ key: "leaderboard-auto-publish-v1", match: "exact" },
+	// Sidebar project collections were "folders" until #5981 renamed them;
+	// the rows moved to v2-sidebar-collections-* with a collectionId field.
+	{ key: "v2-sidebar-folders-", match: "prefix" },
 ];
 
 function matchesDeadKey(key: string): boolean {