feat: CodePilot - desktop GUI for Claude Code

Full-featured desktop application built with Next.js + Electron:
- Streaming chat with Claude Code via Agent SDK
- Session management with SQLite persistence
- Project file tree and file preview
- MCP server and custom skills management
- Permission controls with Code/Plan/Ask modes
- Dark/light theme, token tracking
- macOS DMG packaging with electron-builder

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/app/api/tasks/[id]/route.ts

@@ -0,0 +1,59 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { updateTask, deleteTask, getTask } from '@/lib/db';
+import type { TaskResponse, ErrorResponse, UpdateTaskRequest } from '@/types';
+
+interface RouteContext {
+  params: Promise<{ id: string }>;
+}
+
+export async function PATCH(request: NextRequest, context: RouteContext) {
+  const { id } = await context.params;
+
+  try {
+    const body: UpdateTaskRequest = await request.json();
+    const existing = getTask(id);
+
+    if (!existing) {
+      return NextResponse.json<ErrorResponse>(
+        { error: 'Task not found' },
+        { status: 404 }
+      );
+    }
+
+    const updated = updateTask(id, body);
+    if (!updated) {
+      return NextResponse.json<ErrorResponse>(
+        { error: 'Failed to update task' },
+        { status: 500 }
+      );
+    }
+
+    return NextResponse.json<TaskResponse>({ task: updated });
+  } catch (error) {
+    return NextResponse.json<ErrorResponse>(
+      { error: error instanceof Error ? error.message : 'Failed to update task' },
+      { status: 500 }
+    );
+  }
+}
+
+export async function DELETE(_request: NextRequest, context: RouteContext) {
+  const { id } = await context.params;
+
+  try {
+    const deleted = deleteTask(id);
+    if (!deleted) {
+      return NextResponse.json<ErrorResponse>(
+        { error: 'Task not found' },
+        { status: 404 }
+      );
+    }
+
+    return NextResponse.json({ success: true });
+  } catch (error) {
+    return NextResponse.json<ErrorResponse>(
+      { error: error instanceof Error ? error.message : 'Failed to delete task' },
+      { status: 500 }
+    );
+  }
+}

src/app/api/tasks/route.ts

@@ -0,0 +1,46 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { getTasksBySession, createTask } from '@/lib/db';
+import type { TasksResponse, TaskResponse, ErrorResponse, CreateTaskRequest } from '@/types';
+
+export async function GET(request: NextRequest) {
+  const { searchParams } = request.nextUrl;
+  const sessionId = searchParams.get('session_id');
+
+  if (!sessionId) {
+    return NextResponse.json<ErrorResponse>(
+      { error: 'Missing session_id parameter' },
+      { status: 400 }
+    );
+  }
+
+  try {
+    const tasks = getTasksBySession(sessionId);
+    return NextResponse.json<TasksResponse>({ tasks });
+  } catch (error) {
+    return NextResponse.json<ErrorResponse>(
+      { error: error instanceof Error ? error.message : 'Failed to get tasks' },
+      { status: 500 }
+    );
+  }
+}
+
+export async function POST(request: NextRequest) {
+  try {
+    const body: CreateTaskRequest = await request.json();
+
+    if (!body.session_id || !body.title) {
+      return NextResponse.json<ErrorResponse>(
+        { error: 'Missing session_id or title' },
+        { status: 400 }
+      );
+    }
+
+    const task = createTask(body.session_id, body.title, body.description);
+    return NextResponse.json<TaskResponse>({ task }, { status: 201 });
+  } catch (error) {
+    return NextResponse.json<ErrorResponse>(
+      { error: error instanceof Error ? error.message : 'Failed to create task' },
+      { status: 500 }
+    );
+  }
+}