[codex] Address creator list stability, filters, and hook docs

[BigDella]

Summary

• Add creatorListKey(creatorId) and use it for creator card list keys.
• Add min/max price filters with clear behavior that re-fetches the unfiltered creator list.
• Show a readable error toast plus an inline fallback notice when creator list loading fails.
• Document shared hook folder conventions, naming, and test expectations.

Tests

• pnpm vitest run src/utils/__tests__/creatorListKey.utils.test.ts src/pages/__tests__/LandingPage.priceFilters.integration.test.tsx src/pages/__tests__/LandingPage.apiErrorToast.integration.test.tsx
• pnpm build
• pnpm lint (passes with existing CreatorCard.tsx exhaustive-deps warning)

Notes

• Full pnpm test currently has unrelated existing failures in LandingPage.keyboard.test.tsx, ConnectWalletButton.test.tsx, and TradeDialog tests; the focused tests for this PR pass.

Closes #492.
Closes #493.
Closes #494.
Closes #495.

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