What

Refine rewards copy around mobile invites and earned credits, fix the LinkedIn label, and stop requiring a pasted share URL for WhatsApp reward claims.

Why

The current copy still references specific mobile apps and internal credit-consumption details, the Chinese LinkedIn label has a typo, and WhatsApp sharing often does not produce a public URL that users can paste back into the rewards flow.

How

• update the zh-CN and en rewards copy for mobile invite and earned-credit tooltips
• rename the LinkedIn task label to the correct wording
• remove WhatsApp from the URL-proof task set and adjust related tests

Affected areas

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

Checklist

• pnpm typecheck passes (blocked in this worktree: local toolchain missing, tsc not found)
• pnpm lint passes (blocked in this worktree: biome not found)
• pnpm test passes (blocked in this worktree: vitest not found)
• 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)

Notes for reviewers

This PR intentionally does not change LinkedIn/Facebook share prefill behavior; it only tightens copy and removes the WhatsApp pasted-link requirement.