feat(landing): enhance hero section and update page backgrounds

This commit introduces a significant visual overhaul to the landing page to create a more dynamic and engaging user experience.

Key changes include:
- Replaced the static mobile phone SVG in the hero section with an animated GIF, complete with a "dynamic island" overlay for a more modern look.
- Updated the main page background from a full cover image to a more subtle header background image (`header-bg.svg`).
- Added a new background layer (`bottom-bg.svg`) near the footer to create more visual depth and separation for the contact section.
- Numbered the three main feature descriptions ("1. Discover", "2. Prepare", "3. Win") for improved clarity and flow.

public/dynamic-island.svg

@@ -0,0 +1,62 @@
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