Decide the status from the last approved operation

[loevgaard]

Fixes robustness finding R2 of #57. Stacked on #58 (shares the pending-operation test fixture) — merge that first; this PR's own diff is the last commit.

Problem

StatusAction decided from Operations::latest() — the last operation recorded, not the last one that succeeded:

• processed + [capture 1000, refund attempt the acquirer rejected] → markUnknown(), although the 1000 is demonstrably still held (balance > 0 is already in hand at that point).
• processed + [capture, async refund still pending] → markUnknown() until the callback lands.
• new + [approved authorize, rejected capture attempt] → markFailed(), although the authorization is intact and a retry is possible.

Downstream consumers (Sylius state machines) treat unknown/failed as dead ends, so a payment holding real money fell out of the flow.

Fix

New Operations::latestApproved() returns the most recent operation with an approved status code, skipping trailing rejected/pending attempts. Both the new and processed branches of StatusAction now decide from it. The refund branch's balance logic (partial refund stays captured, zero balance is refunded) is unchanged, as is markUnknown when nothing approved exists at all.

Operations::isLatestApproved() is no longer used by the package but stays — it is public API.

Tests

Rejected-refund-stays-captured, pending-refund-stays-captured, rejected-capture-stays-authorized, new with no operations pins failed, unmodeled state string pins unknown, plus direct Operations::latestApproved() coverage.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.75%. Comparing base (5cfe38b) to head (9123481).

Additional details and impacted files

@@                             Coverage Diff                              @@
##             fix/confirm-payment-approved-authorize      #59      +/-   ##
============================================================================
+ Coverage                                     97.43%   97.75%   +0.31%     
- Complexity                                      126      129       +3     
============================================================================
  Files                                            14       14              
  Lines                                           351      356       +5     
============================================================================
+ Hits                                            342      348       +6     
+ Misses                                            9        8       -1     

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