Add invite codes feature (#94)

* Refactor import statement in store configuration for clarity

- Combined the import of `configureStore` and `Middleware` from '@reduxjs/toolkit' into a single line for improved readability.

* Add invite codes feature with onboarding step and dedicated page

Implement frontend for the invite codes system: users get 5 invite codes
to share, can redeem codes for free credits, and new users are prompted
during onboarding (step 1) to enter an invite code.

- Add invite types, API service, and Redux slice
- Add InviteCodeStep as first onboarding step (skip-able)
- Add /invites page with redeem input and code list with copy buttons
- Add "Invite Friends" nav item to sidebar
- Update UserReferral interface to match backend PR #418

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

* Update reqwest dependency to enable HTTP/2 support and switch to rustls TLS in network requests

- Modified Cargo.toml to include the "http2" feature for reqwest.
- Updated network request implementations in bridge and ops_net modules to use rustls TLS instead of native TLS for improved security and compatibility.

* Update event loop to handle async tool calls and improve message processing

- Introduced a `PendingToolCall` struct to manage in-flight async tool calls.
- Enhanced the event loop to check for completion of async tool calls and handle timeouts.
- Updated message handling to support async tool execution, allowing the event loop to process other messages concurrently.
- Refactored `handle_tool_call` to differentiate between synchronous and asynchronous tool results.
- Modified JavaScript fetch functions to use async/await for improved readability and performance.

* Enhance skill instance with initial ping verification and job driving

- Added an immediate ping to verify the connection health during skill execution, logging the result or any errors encountered.
- Updated the event loop to drive jobs asynchronously after the initial ping check.
- Removed unnecessary logging statements from the network operations for cleaner output.

* Update subproject commit reference in skills directory

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

src/services/api/inviteApi.ts

@@ -0,0 +1,28 @@
+import type { ApiResponse } from '../../types/api';
+import type { InviteCode } from '../../types/invite';
+import { apiClient } from '../apiClient';
+
+export const inviteApi = {
+  /** GET /invite/my-codes — list user's 5 invite codes with usage history */
+  getMyInviteCodes: async (): Promise<InviteCode[]> => {
+    const response = await apiClient.get<ApiResponse<InviteCode[]>>('/invite/my-codes');
+    return response.data;
+  },
+
+  /** POST /invite/redeem — redeem an invite code */
+  redeemInviteCode: async (code: string): Promise<{ message: string }> => {
+    const response = await apiClient.post<ApiResponse<{ message: string }>>('/invite/redeem', {
+      code,
+    });
+    return response.data;
+  },
+
+  /** GET /invite/status?code=X — check if an invite code is valid (no auth required) */
+  checkInviteCode: async (code: string): Promise<{ valid: boolean }> => {
+    const response = await apiClient.get<ApiResponse<{ valid: boolean }>>(
+      `/invite/status?code=${encodeURIComponent(code)}`,
+      { requireAuth: false }
+    );
+    return response.data;
+  },
+};