fix: sync desktop rewards gift balance from cloud credits

[nettee]

What

Use the cloud credits summary as the source of truth for desktop rewards gift balance, and show that value in the workspace sidebar.

Why

The desktop rewards UI could show an incorrect gift balance because it relied on rewards status data that does not carry the full credit balance shape. This keeps the displayed balance aligned with the cloud credits API and preserves a usable fallback when rewards status cannot be fetched.

How

• fetch /api/v1/credits/summary alongside rewards status and reward claim flows, then map its balance payload into desktop rewards status
• extend shared reward/credit schemas and generated web API types so giftBalance is available end to end, while preserving fallback behavior when the credits summary call fails
• update the workspace sidebar to read giftBalance from cloudBalance, add focused tests, and reset the local profile authSource when switching cloud profiles

Affected areas

• Desktop app (Electron shell)
• Controller (backend / API)
• Web dashboard (React UI)
• OpenClaw runtime
• Skills
• Shared schemas / packages
• Build / CI / Tooling

Checklist

• pnpm typecheck passes
• pnpm lint passes
• pnpm test passes
• pnpm generate-types run (if API routes/schemas changed)
• No credentials or tokens in code or logs
• No any types introduced (use unknown with narrowing)

[sentry]

Codecov Report

❌ Patch coverage is 47.24409% with 67 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
apps/controller/src/store/nexu-config-store.ts	46.87%	34 Missing ⚠️
...ps/controller/src/services/cloud-reward-service.ts	36.58%	26 Missing ⚠️
apps/web/src/layouts/workspace-layout.tsx	66.66%	5 Missing ⚠️
apps/web/src/i18n/locales/en.ts	0.00%	2 Missing ⚠️

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