Fix deploy: save Void platform connection before void deploy

[Copilot]

The Deploy to Void job on main has failed since the Void 0.26 upgrade. The build succeeds, then void deploy aborts with platform: No connection to https://api.void.cloud. Run void connect … first. Void 0.26 expects a saved platform connection in every fresh CI environment, and the workflow never created one.

Changes

• .github/workflows/ci.yml (deploy job)
  • New Connect to Void platform step runs before deploy. --no-login records the verified connection without authenticating, so GitHub OIDC still supplies the credentials.
  • The deploy command now passes --platform void, as the 0.26 CI docs show.
  • The "Single step" comment above the deploy step is reworded because deploy is now two steps.

- name: Connect to Void platform
  run: npx void connect "$VOID_API_URL" --no-login

- name: Deploy
  run: npx void deploy --platform void --project "$VOID_PROJECT" --skip-build

Notes for review

• The change follows the 0.26 docs (guide/deployment.md, reference/cli/deploy.md). It only runs on push to main, so it hasn't been run against the real OIDC exchange. The first main run after merge will confirm it.
• VOID_API_URL already comes from the job env, so no new secrets or repo variables are needed.

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