Create Profile Page Skeleton

## Overview
Create a profile page with account management and runners section for authenticated users.

## Acceptance Criteria
- [ ] /profile route with two sections:
- Account: name, email, role badge; Edit modal → PUT /api/v1/users/me
- My Runners: empty state text + "Create Runner" button
- [ ] Toasts: success and error; API errors shown plainly
- [ ] Profile renders from /api/v1/users/me; edits persist; user feedback is clear

## Test Notes
- Test profile page loads with user data
- Test account edit functionality
- Test error handling for API failures
- Test responsive design on mobile

## Implementation Notes
- Use existing API endpoints for user data
- Implement proper form validation
- Add loading states and error handling
- Ensure proper user feedback for all actions

Start at the existing frontend route structure and API client, then trace /api/v1/users/me and the PUT endpoint. Build and test the /profile page against the listed account, runner, loading, validation, toast, error, persistence, and responsive criteria; done means authenticated users can view and edit their profile and see the empty runners state.

Written by the indexing model from the issue text.