Homepage: share your month (recap cards)

[xuelink]

The app now lets every page of the monthly recap be shared as its own picture (langx/langx#1731). This adds a fifth chapter to the homepage story, share your month.: the six cards (intro, messages, corrections, Echo, streak, the summary) shown as a fanned hand that deals out when the chapter scrolls into view. A card under the pointer lifts.

• The images are real renders from the API's card code for the example account (@sofia, her sample portrait, September), story-shaped, downscaled to 540×960 WebP (18–31 KB each), and lazy-loaded.
• Reduced motion: the hand is shown already fanned, with no transition.
• Copy stays short and has no numbers to explain, as on the rest of the homepage.

Verified

• npm run check: 0 errors. The two warnings are pre-existing. npx vite build passes, and the chapter is in the prerendered index.html. npm run lint lists the same pre-existing Prettier warnings as main; Story.svelte is not among them.
• Looked at it on the built site: desktop light and dark, and a 375 px phone, where the hand stays inside the screen with no horizontal scroll.

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