chore: isolate E2E tests on port 3015 to avoid dev server conflicts

[mahata]

Summary

• Moves the E2E test server from port 3000 to port 3015 so it never collides with a running dev server.
• Previously, reuseExistingServer: true (the local default) would silently reuse a dev server on port 3000, which connects to the wrong database (postgres instead of test) and may lack NODE_ENV=development — causing test data leaks or auth failures.

Changes

• playwright.config.ts: Updated baseURL, webServer.url to localhost:3015, and added PORT: "3015" to webServer.env.
• e2e/auth-helpers.ts: Updated TEST_ORIGIN to http://localhost:3015.

[Copilot]

Pull request overview

This PR updates the Playwright E2E configuration to run the app server on port 3015 instead of 3000, preventing Playwright’s reuseExistingServer: true behavior from accidentally reusing a developer’s local dev server (and therefore the wrong database/env).

Changes:

• Switch Playwright baseURL and webServer.url to http://localhost:3015.
• Set PORT=3015 in Playwright webServer.env so the app actually binds to that port.
• Update E2E auth helper TEST_ORIGIN to match the new port.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
playwright.config.ts	Moves E2E server URL/baseURL to 3015 and sets PORT in the spawned server env.
e2e/auth-helpers.ts	Aligns the Origin header used by helper requests with the new E2E port.