fix(web): parse pool total shares

[pollychen-lab]

Closes #265.

Summary

• Populate totalShares from raw.total_shares in the web pool stats transformer.
• Add focused regression coverage for the transformer parser.
• Extend the existing API parser test to assert totalShares.

Validation

• corepack pnpm --config.dangerouslyAllowAllBuilds=true --dir apps/web exec vitest run lib/transformers.test.ts
• corepack pnpm --config.dangerouslyAllowAllBuilds=true --dir apps/web exec vitest run lib/api.test.ts -t parseRawPoolStats

Note: corepack pnpm --config.dangerouslyAllowAllBuilds=true --filter @trusttrove/sdk build && corepack pnpm --config.dangerouslyAllowAllBuilds=true --filter web exec tsc --noEmit still fails on existing unrelated web type errors, including missing useTokenAllowance/initApiClientWithToken symbols and stale component/test types.

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