Add playwright end-to-end tests for syncing

[p-sw]

Integrate Playwright for end-to-end syncing tests and automate their execution via GitHub Actions on frontend PRs.

These tests verify key sync behaviors, including joining an existing key, server-to-client and client-to-server data propagation, and multi-client updates, by simulating real user interactions and data changes.

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[cursor]

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Status	Name	Latest Commit	Updated (UTC)
✅ Deployment successful! View logs	psw-chat	befddd3	Oct 25 2025, 03:09 AM

[p-sw]

@cursor erase existing test cases in the current test and add new one that:

• Tests if creating new sync key is working
• Tests if joining existing sync key is working
• After joining, tests if successfully synced all data in localStorage

[cursor]

Done. I replaced the existing E2E with a single, focused test that:

• Tests creating a new sync key via the UI.
• Tests joining an existing sync key via the UI on a second client.
• After joining, asserts that all pre-seeded localStorage data synced to the second client.

How it works

• Seeds two localStorage keys before app scripts run.
• Uses “Generate New Key” to create and enable sync.
• Verifies the server contains the seeded keys.
• Opens a second browser context, “Use Key” to join.
• Verifies both seeded keys exist in client 2 localStorage.

You can run it locally:

• From packages/frontend: bun run test:e2e -g "sync:"

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[p-sw]

@cursor add sync.db and test_results in frontend's .gitignore and remove it from git

[cursor]

Added ignores and removed from git:

• Updated packages/frontend/.gitignore to include:
  • test-results/
  • sync.db
• Untracked any existing files:
  • Removed packages/frontend/sync.db and packages/frontend/test-results/.last-run.json from the index.

Committed the change.

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