Persists device and app stores across sessions (#860)

* Persistence for device and app data

* esphemeral -> ephemeral

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* devices -> app

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Additional waypoint methods, update mock, update tests

---------

Co-authored-by: philon- <philon-@users.noreply.github.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

packages/web/src/core/services/dev-overrides.ts

@@ -7,5 +7,7 @@ if (isDev) {
   featureFlags.setOverrides({
     persistNodeDB: true,
     persistMessages: true,
+    persistDevices: true,
+    persistApp: true,
   });
 }

packages/web/src/core/services/featureFlags.ts

@@ -4,6 +4,8 @@ import { z } from "zod";
 export const FLAG_ENV = {
   persistNodeDB: "VITE_PERSIST_NODE_DB",
   persistMessages: "VITE_PERSIST_MESSAGES",
+  persistDevices: "VITE_PERSIST_DEVICES",
+  persistApp: "VITE_PERSIST_APP",
 } as const;
 
 export type FlagKey = keyof typeof FLAG_ENV;