[TESTING] Expand Playwright E2E tests to cover critical user flows

[itigges22]

Description

Current State

There's only 1 E2E test file (e2e/project-page-permissions.spec.ts) covering permission-based access. Critical user flows are untested:

• Project creation and editing
• Task management (Kanban drag-drop)
• Workflow execution (multi-step approval flows)
• Time tracking (clock in/out, logging entries)
• User role assignment
• Analytics page loading

The existing test structure is good — we just need more coverage.

Desired Outcome

Expand to cover:

e2e/
  auth/
    login.spec.ts
    signup.spec.ts
  projects/
    project-crud.spec.ts
    project-assignments.spec.ts
  tasks/
    task-kanban.spec.ts
    task-gantt.spec.ts
  workflows/
    workflow-creation.spec.ts
    workflow-execution.spec.ts
  time-tracking/
    clock-session.spec.ts
    time-entry-crud.spec.ts

Priority tests

1. Login/logout flow
2. Project CRUD with permission checks
3. Workflow execution (start → complete)
4. Time entry creation

How to get started

1. Review existing test in e2e/project-page-permissions.spec.ts for patterns
2. Set up test users via npm run setup:test-roles
3. Start with login flow test (simplest)
4. Build up to workflow execution (complex)

Testing infrastructure notes

• Playwright is configured in playwright.config.ts
• Run with npm run test:playwright
• Tests need Supabase running (npm run docker:start)

Acceptance Criteria

• 5+ new E2E test files
• Auth flow tested
• Project CRUD tested
• At least one workflow test
• All tests pass in CI