fix(app): invalidate incompatible replica cache

Todo timeline entries gained required activity metadata in beta.1 while the persisted cache format remained unchanged. Reject version 3 snapshots so upgrades hydrate authoritative state instead of rendering legacy rows.

packages/app/src/runtime/replica-cache/index.test.ts

@@ -272,7 +272,7 @@ describe("ReplicaCache", () => {
       version: number;
       hosts: Array<{ timeline: Record<string, unknown> | null }>;
     };
-    expect(persisted.version).toBe(3);
+    expect(persisted.version).toBe(4);
     expect(Object.keys(persisted.hosts[0]?.timeline ?? {}).sort()).toEqual(["agentId", "items"]);
   });
 
@@ -331,12 +331,12 @@ describe("ReplicaCache", () => {
     expect(Object.keys(useSessionStore.getState().sessions).sort()).toEqual(["host-a", "host-c"]);
   });
 
-  it("rejects version 1 cache data and overwrites it on flush", async () => {
+  it("rejects version 3 cache data and overwrites it on flush", async () => {
     const storage = new MemoryStorage();
     storage.values.set(
       "@paseo:replica-cache",
       JSON.stringify({
-        version: 1,
+        version: 3,
         hosts: [
           {
             serverId: SERVER_ID,
@@ -361,7 +361,7 @@ describe("ReplicaCache", () => {
 
     expect(useSessionStore.getState().sessions[SERVER_ID]).toBeUndefined();
     expect(JSON.parse(storage.values.get("@paseo:replica-cache") ?? "null")).toEqual({
-      version: 3,
+      version: 4,
       hosts: [],
     });
   });

packages/app/src/runtime/replica-cache/index.ts

@@ -23,7 +23,7 @@ import { isUnreconciledLocalUserMessage, type StreamItem } from "@/types/stream"
 import { normalizeAgentSnapshot } from "@/utils/agent-snapshots";
 
 const STORAGE_KEY = "@paseo:replica-cache";
-const CACHE_VERSION = 3;
+const CACHE_VERSION = 4;
 const PERSIST_DELAY_MS = 750;
 const MAX_TIMELINE_ITEMS = 50;
 const MAX_CACHE_BYTES = 1024 * 1024;