Add comprehensive automated test coverage

[SagiEv]

Add comprehensive automated test coverage

Goal

Establish automated testing across the full JobPilot stack.

Backend

Add unit tests covering:

• Business logic
• Application status transitions
• Event chronology
• Email parsing
• Company matching
• Role matching
• Analytics
• Export functionality
• AI-service integrations/mocks

AI Service

Add tests for:

• Classification
• Structured output
• JSON schema validation
• Role-fit analysis
• Email classification
• Confidence handling
• Hallucination/ambiguous-result safeguards

AI tests should use deterministic mocks/fixtures where appropriate.

Integration tests

Test:

• API ↔ database
• Application lifecycle
• Email processing → application matching → status update
• Export flows
• MCP data access

Frontend tests

Test:

• Components
• Forms
• Status update UI
• Native notifications/dialogs
• Application list/detail loading
• Analytics rendering
• CV rendering

E2E tests

Cover critical user journeys:

• Create application
• Update application status
• Add historical event
• Add interview
• Process incoming email
• Open application details
• Export data
• Tailor CV
• View analytics

Lint

Add linting to the automated pipeline.

Acceptance Criteria

• Backend unit tests are established.
• AI service tests are established.
• Integration tests are established.
• Frontend tests are established.
• E2E tests cover critical flows.
• Lint runs automatically.
• Test commands are documented.
• CI fails when tests or lint fail.