fix: repair broken catalog images and seed full crop catalog + payment ledger

[leandrogavidia]

Body:

The deployed inventory ("Mi Inventario de Cultivos") showed a broken image
and an incorrect one. Root cause: both preset crops in presetCrops.ts
pointed at bad Unsplash URLs.

• Lechuga Romana → its Unsplash photo returned HTTP 404 → broken-image icon.

• Albahaca Genovesa → loaded, but the photo was actually bananas (wrong content).

• Lechuga Romana → its Unsplash photo returned HTTP 404 → broken-image icon.

• Albahaca Genovesa → loaded, but the photo was actually bananas (wrong content).

This PR fixes the images, replaces the 2 placeholder crops with the real
catalog, hardens image loading against future dead links, and seeds the
Solana payment ledger with default records.

Changes

Crop catalog (src/presetCrops.ts)

• Replaced the 2 broken placeholders with 11 crops: Papaya, Prontoalivio,
  Aguacate (Palta), Yuca, Plátano Bizcochito, Bananito, Café, Toronjil, Yuca,
  Tomate, Caña de azúcar.
• Each entry has scientific name, full Spanish description, care level,
  sunlight/water/harvest info, prices and stock.
• All images are now Wikimedia-hosted (stable, won't 404 like Unsplash).
  Every image was downloaded and visually verified for correct content.

Resilient image loading (src/App.tsx)

• Added an onError fallback to all crop <img> tags. If any external image
  ever fails, it degrades to an inline SVG placeholder instead of a broken icon.

Solana Ledger (src/presetTransactions.ts)

• Seeded the "Registro de Pagos" with 2 default records (Café x2 = 10.8 USDC,
  Café x1 = 4.59 USDC), wired as the default state when no transactions are
  saved (mirrors the crop-preset pattern).

Notes / follow-ups

• localStorage caching: the catalog and ledger load from localStorage
  (solana_huerto_crops, solana_huerto_txs) first and only fall back to the
  presets when empty. Returning browsers must clear those keys to see the new
  data; fresh/incognito sessions see it immediately.
• Prices & stock are placeholder defaults (illegible in source screenshots);
  editable in-app.
• One crop pending: a 12th crop was cut off below the fold in the source
  screenshots and still needs to be added.
• Sales volume now reflects only the 2 seeded transactions (≈ $15.39).

[vercel]

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