feat(e2e): migrate to CrabNebula tauri-e2e-tests for macOS support

[devin-ai-integration]

feat(e2e): migrate to CrabNebula tauri-e2e-tests for macOS support

Summary

This PR migrates the e2e testing infrastructure to use CrabNebula's @crabnebula/tauri-driver package, which provides macOS support for Tauri e2e tests via their webdriver implementation.

Key changes:

• Added CrabNebula packages (@crabnebula/tauri-driver, @crabnebula/test-runner-backend, @crabnebula/webdriverio-cloud-reporter) to e2e/blackbox
• Updated wdio config to use waitTauriDriverReady() for proper driver initialization and added macOS-specific onPrepare hook that starts test-runner-backend when CN_API_KEY is set
• Added tauri-plugin-automation as an optional dependency with automation feature flag for macOS e2e testing support
• Changed tauri-driver invocation from direct binary path to pnpm tauri-driver

Updates since last revision

• Fixed timing issue with tauri-driver startup by increasing connectionRetryCount from 0 to 3
• Verified e2e tests pass on Linux locally (3 passing tests in 15s)

Review & Testing Checklist for Human

• Test on macOS: Run the e2e tests on macOS with CN_API_KEY set to verify the CrabNebula integration works
• Test the automation feature flag: Build with --features automation and verify the plugin is registered correctly on macOS

Recommended test plan for macOS:

# Build with automation feature
pnpm -F desktop tauri build --features automation

# Run e2e tests
cd e2e/blackbox
CN_API_KEY=cn_OUz3WLKsYgrO1TcXy19C9cYcefoJebiSIetkQS_kHbLh14NeI_kavhKRW81U5ILbBn3PphRBPGrQk8M7cJHRDw pnpm test

Notes

• The automation feature flag approach was chosen per user request for better control in the build pipeline (similar to how devtools feature is used)
• Linux e2e tests verified locally: all 3 tests passing
• Reference docs: https://docs.crabnebula.dev/plugins/tauri-e2e-tests/#macos-support

Link to Devin run: https://app.devin.ai/sessions/865b1b66e8684f248af03374dca5314f
Requested by: yujonglee (@yujonglee)

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