This commit implements a series of improvements to the ParVagues subsite, addressing issues related to layout, interactivity, and content presentation.

Key changes include:

1.  **Header Redesign:**
    *   Implemented a thinner, single-row fixed header.
    *   Logo positioned top-left, navigation links centered, and "Book" button top-right.
    *   Dynamic title now appears next to the logo on scroll or non-home pages.

2.  **Interactive Section ("Potentiel/Composition/Performance"):**
    *   Added a pointer cursor for section selection.
    *   The active section is now clearly highlighted.
    *   Implemented auto-toggling between sections every 5 seconds, with timer reset on manual click.

3.  **Album Link Sorting:**
    *   Platform links for albums in the "Sorties" section are now consistently ordered: YouTube > Deezer > Spotify > Apple Music > Tidal > Amazon.

4.  **Upcoming Events ("Prochains Événements"):**
    *   Events are now sorted by increasing date (soonest first).
    *   Card styling was reviewed and confirmed to be appropriate.

5.  **Event Page Restructure:**
    *   Improved typography: Event title is H1, countdown timer is a prominent H2, and location is H3.
    *   Enhanced above-the-fold visibility of key event information and teasers.
    *   Revamped image gallery:
        *   Displays all images as fixed-size cards in a masonry layout.
        *   Images open in a modal view on click, with a close button and Esc key dismissal.
        *   Transparent images (PNGs) now have a light background for better visibility in cards and modal.

6.  **Footer Fix:**
    *   Resolved issue where footer content (especially links) could be hidden.
    *   Removed `overflow: hidden` from the footer and adjusted its internal layout (logo size, column structure) to ensure all content is visible.
    *   Confirmed main page flexbox structure correctly pushes the footer to the bottom of the viewport.

These changes collectively improve the visual appeal, usability, and information hierarchy of the ParVagues subsite.