### Requirement: Loading skeleton on main routes
The application SHALL display a skeleton loading state during navigation to `/sessions` and `/users` routes, activated by Next.js App Router streaming via `loading.tsx` files.

#### Scenario: Navigation to sessions page shows skeleton
- **WHEN** a user navigates to `/sessions`
- **THEN** a loading skeleton SHALL be displayed immediately while the page data loads

#### Scenario: Navigation to users page shows skeleton
- **WHEN** a user navigates to `/users`
- **THEN** a loading skeleton SHALL be displayed immediately while the page data loads

### Requirement: Modal lazy loading
Heavy modal components (ShareModal) SHALL be loaded lazily via `next/dynamic` to reduce the initial JS bundle size.

#### Scenario: ShareModal not in initial bundle
- **WHEN** a page loads that contains a ShareModal trigger
- **THEN** the ShareModal component code SHALL NOT be included in the initial JS bundle
- **THEN** the ShareModal code SHALL be fetched only when first needed