fix: migrate workspace/project IDs to string and widen schema enums

- Change workspace id/projectId from z.number() to z.union([z.string(), z.number()]).transform(String) for backward compat
- Add "non_git" to projectKind, "local_checkout" to workspaceKind enums
- Session converts numeric IDs to strings at the descriptor boundary
- Update tests and daemon-client event types to match

packages/app/src/hooks/use-open-project.test.ts

@@ -70,8 +70,8 @@ describe("openProjectDirectly", () => {
           requestId: "request-1",
           error: null,
           workspace: {
-            id: 1,
-            projectId: 1,
+            id: "1",
+            projectId: "1",
             projectDisplayName: "project",
             projectRootPath: WORKSPACE_ID,
             workspaceDirectory: WORKSPACE_ID,