feat: journal dashboard widgets, agent polish, and edit-mode live previews

Journal dashboard widgets and quick-add; rich-text quick-add dialogs.

Dashboard draft sync for live edit previews; assistant bubble + API tools.

Journal UX: stress slider, mood grid, query cap fix.

tests/unit/assistant-chat-storage.test.ts

@@ -0,0 +1,52 @@
+import assert from "node:assert/strict";
+import { describe, it } from "node:test";
+import {
+  clearAssistantChat,
+  loadAssistantChat,
+  saveAssistantChat,
+} from "../../src/modules/agent/assistant-chat-storage";
+
+const storage = new Map<string, string>();
+
+Object.defineProperty(globalThis, "localStorage", {
+  value: {
+    getItem: (key: string) => storage.get(key) ?? null,
+    setItem: (key: string, value: string) => {
+      storage.set(key, value);
+    },
+    removeItem: (key: string) => {
+      storage.delete(key);
+    },
+  },
+  configurable: true,
+});
+
+describe("assistant chat storage", () => {
+  it("round-trips messages per user", () => {
+    storage.clear();
+    const userId = "user-a";
+    const messages = [
+      { role: "user" as const, content: "hello" },
+      { role: "assistant" as const, content: "hi there" },
+    ];
+
+    saveAssistantChat(userId, messages);
+    assert.deepEqual(loadAssistantChat(userId), messages);
+  });
+
+  it("keeps sessions isolated by user id", () => {
+    storage.clear();
+    saveAssistantChat("user-a", [{ role: "user", content: "for a" }]);
+    saveAssistantChat("user-b", [{ role: "user", content: "for b" }]);
+
+    assert.deepEqual(loadAssistantChat("user-a"), [{ role: "user", content: "for a" }]);
+    assert.deepEqual(loadAssistantChat("user-b"), [{ role: "user", content: "for b" }]);
+  });
+
+  it("clears stored chat", () => {
+    storage.clear();
+    saveAssistantChat("user-a", [{ role: "user", content: "hello" }]);
+    clearAssistantChat("user-a");
+    assert.deepEqual(loadAssistantChat("user-a"), []);
+  });
+});