Allow cancel and approve transitions from any ticket state

Tinker

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Description

## Problem

Currently `cancel` and `approve` transitions are only available from specific states. This prevents Product Owners from directly cancelling or approving tickets regardless of their current status.

## States Affected

Current limitations:
- `cancel` not available from: `pending_approval`, `done`, etc.
- `approve` only available from: `pending_approval`

A PO should be able to:
- Cancel any ticket from any state (e.g., stale tickets stuck in workflow)
- Approve any ticket from any state (e.g., fast-track approved work)

## Solution

Update the ticket state machine to allow `cancel` and `approve` transitions from **all** states. These are PO override commands and should bypass normal workflow constraints.

## Files to Modify

- `app/models/ticket.rb` - Update state machine transitions
- Add tests for new global transitions

## Acceptance Criteria

- `cancel` transition available from all ticket states
- `approve` transition available from all ticket states  
- Tests added for global cancel/approve
- No breaking changes to existing workflow