Finalize governance widget component boundaries

[eldwin-easynet-world]

Summary

• Split the governance widget implementation into focused component, primitive, type, and utility modules while preserving the public exports.
• Replaced the browser-only voter avatar <img> rendering with React Native Image, and declared the React Native / React Native Web peer/dev dependencies needed for native and Storybook web targets.
• Kept the governance package boundary intact; no wallet, contract, subgraph, or runtime integration was added.

Validation

Run from a clean /tmp/goodwidget-income checkout with this branch patch applied:

• corepack pnpm install --store-dir /Users/boqiang.liang/.pnpm-store
• corepack pnpm --filter @goodwidget/storybook... build
• STORYBOOK_DISABLE_TELEMETRY=1 corepack pnpm --filter @goodwidget/storybook build-storybook
• pnpm test:demo tests/widgets/governance-widget — 11 passed
• git diff --check
• rg -n "<img|governanceComponents|from './governanceComponents'" packages/governance-widget examples/storybook/src/stories/governance-widget tests/widgets/governance-widget — no matches

Notes:

• The first isolated @goodwidget/storybook build-storybook attempt failed until workspace dependencies such as @goodwidget/core and @goodwidget/citizen-claim-widget were built; pnpm --filter @goodwidget/storybook... build resolves that dependency-order issue.
• Playwright initially needed a local Chromium cache fix on this machine; after the executable was available, the governance widget suite passed 11/11.

Relates to #50, #46, and #47.

[boqiang]

Closing this from my side to respect the GoodBounties assignment flow. Since #50 is assigned to @edehvictor, I don't want this PR to compete with or distract from the assigned implementation. Thanks for the clarification on the contributor process.