Chat search (#1224)

Based on https://github.com/dyad-sh/dyad/pull/1116
    
<!-- This is an auto-generated description by cubic. -->
---

## Summary by cubic
Adds a fast chat search dialog (Command Palette) to find and jump
between chats. Open via the sidebar button or Ctrl/Cmd+K, with title and
message text search plus inline snippets.

- New Features
  - Command palette using cmdk with keyboard shortcut (Ctrl/Cmd+K).
- Searches within the selected app across chat titles and message
content via a new IPC route (search-chats).
- Debounced queries (150ms) with React Query; results de-duplicated and
sorted by newest.
- Snippet preview with highlighted matches and custom ranking; selecting
a result navigates and closes the dialog.
- Search button added to ChatList; basic e2e tests added (currently
skipped).

- Dependencies
  - Added cmdk@1.1.1.
- Bumped @radix-ui/react-dialog to ^1.1.15 and updated Dialog to support
an optional close button.

<!-- End of auto-generated description by cubic. -->

---------

Co-authored-by: Evans Obeng <iamevansobeng@outlook.com>
Co-authored-by: Evans Obeng <60653146+iamevansobeng@users.noreply.github.com>

src/ipc/handlers/chat_handlers.ts

@@ -1,8 +1,8 @@
 import { ipcMain } from "electron";
 import { db } from "../../db";
 import { apps, chats, messages } from "../../db/schema";
-import { desc, eq } from "drizzle-orm";
-import type { ChatSummary } from "../../lib/schemas";
+import { desc, eq, and, like } from "drizzle-orm";
+import type { ChatSearchResult, ChatSummary } from "../../lib/schemas";
 import * as git from "isomorphic-git";
 import * as fs from "fs";
 import { createLoggedHandler } from "./safe_handle";
@@ -115,4 +115,61 @@ export function registerChatHandlers() {
   handle("delete-messages", async (_, chatId: number): Promise<void> => {
     await db.delete(messages).where(eq(messages.chatId, chatId));
   });
+
+  handle(
+    "search-chats",
+    async (_, appId: number, query: string): Promise<ChatSearchResult[]> => {
+      // 1) Find chats by title and map to ChatSearchResult with no matched message
+      const chatTitleMatches = await db
+        .select({
+          id: chats.id,
+          appId: chats.appId,
+          title: chats.title,
+          createdAt: chats.createdAt,
+        })
+        .from(chats)
+        .where(and(eq(chats.appId, appId), like(chats.title, `%${query}%`)))
+        .orderBy(desc(chats.createdAt))
+        .limit(10);
+
+      const titleResults: ChatSearchResult[] = chatTitleMatches.map((c) => ({
+        id: c.id,
+        appId: c.appId,
+        title: c.title,
+        createdAt: c.createdAt,
+        matchedMessageContent: null,
+      }));
+
+      // 2) Find messages that match and join to chats to build one result per message
+      const messageResults = await db
+        .select({
+          id: chats.id,
+          appId: chats.appId,
+          title: chats.title,
+          createdAt: chats.createdAt,
+          matchedMessageContent: messages.content,
+        })
+        .from(messages)
+        .innerJoin(chats, eq(messages.chatId, chats.id))
+        .where(
+          and(eq(chats.appId, appId), like(messages.content, `%${query}%`)),
+        )
+        .orderBy(desc(chats.createdAt))
+        .limit(10);
+
+      // Combine: keep title matches and per-message matches
+      const combined: ChatSearchResult[] = [...titleResults, ...messageResults];
+      const uniqueChats = Array.from(
+        new Map(combined.map((item) => [item.id, item])).values(),
+      );
+
+      // Sort newest chats first
+      uniqueChats.sort(
+        (a, b) =>
+          new Date(b.createdAt).getTime() - new Date(a.createdAt).getTime(),
+      );
+
+      return uniqueChats;
+    },
+  );
 }

src/ipc/ipc_client.ts

@@ -4,6 +4,7 @@ import {
   ChatSummariesSchema,
   type UserSettings,
   type ContextPathResults,
+  ChatSearchResultsSchema,
 } from "../lib/schemas";
 import type {
   AppOutput,
@@ -63,7 +64,11 @@ import type {
   UpdatePromptParamsDto,
 } from "./ipc_types";
 import type { Template } from "../shared/templates";
-import type { AppChatContext, ProposalResult } from "@/lib/schemas";
+import type {
+  AppChatContext,
+  ChatSearchResult,
+  ProposalResult,
+} from "@/lib/schemas";
 import { showError } from "@/lib/toast";
 
 export interface ChatStreamCallbacks {
@@ -288,6 +293,20 @@ export class IpcClient {
     }
   }
 
+  // search for chats
+  public async searchChats(
+    appId: number,
+    query: string,
+  ): Promise<ChatSearchResult[]> {
+    try {
+      const data = await this.ipcRenderer.invoke("search-chats", appId, query);
+      return ChatSearchResultsSchema.parse(data);
+    } catch (error) {
+      showError(error);
+      throw error;
+    }
+  }
+
   // Get all apps
   public async listApps(): Promise<ListAppsResponse> {
     return this.ipcRenderer.invoke("list-apps");