feat(cosmicfest): Integrate audio players and enhance UI/UX

Implements a modal for viewing V0 gallery photos and makes further
adjustments to audio player and gallery item styling based on feedback.

Key changes:
- SoundCloud Player: Adjusted to 450x450px and updated CSS for flex layout.
- V0 Gallery Photos:
    - Ensured min-height of 150px is respected (current height 200px).
    - Implemented a modal view:
        - Click on photo opens it in a full-size modal.
        - Modal can be closed with Escape key, overlay click, or close button.
        - Uses Next.js Image for optimized display within the modal.
        - Prevents background scroll when modal is open.
        - Includes accessibility attributes (ARIA, keyboard navigation).

Addresses feedback from previous commit:
- Increases the size of V0 gallery photos by adjusting grid min-width and item height.
- Updates the audio section title to "audio ~ ParVagues" and description as requested.
- Implements a flex layout for the Bandcamp and SoundCloud players:
    - Players are displayed side-by-side on screens wider than 768px.
    - Players stack vertically on screens 768px or narrower.

Integrates Bandcamp and SoundCloud players for the ParVagues live set
into the CosmicFest page.

Key changes:
- Added Bandcamp embed for track-by-track listening.
- Added SoundCloud embed for the continuous mix (downloads enabled).
- Updated "prends la prochaine vague" button to a mailto link.
- Reduced padding and font sizes for lineup tiles for a more compact look.
- Ensured lineup artist names and emojis stay on a single line with responsive font sizing.
- Improved hero section text contrast.
- Enhanced V0 gallery:
    - Improved visibility of alt text for photos.
    - Made entire video items clickable links.
    - Standardized gallery item styling.
- General mobile-first and accessibility improvements.

feat: Add YouTube to ParVagues footer and fix header booking link

- Added YouTube icon and link to the social media section in the ParVagues footer.
- Updated the header booking link to the correct mailto address.

feat: Initial landing page for cosmicfest subsite

- Modifies the focus selectors in `cosmicfest.module.css` to use `:global()` to comply with CSS Modules restrictions.
- This resolves the build failure.

- Creates basic structure for /cosmicfest.
- Implements main landing page with sections for hero, lineup, v0 (previous edition) content, countdown, CTA, and festival off teaser.
- Includes placeholders for images and video content.
- Adds styling for a light theme, reflecting the 'surfers cross techno' vibe with lowercase aesthetic.
- Countdown component implemented.
- Basic responsive design considerations included.

ParVagues overhaul