Test: Cover daily transaction ledger page flows

[klondikemarlen]

Relates to:

• Web: record and manage daily transactions #8

Context

The merged daily-transaction workflow has dialog-level and multipart-transport tests, but it lacks page-level regression coverage for the ledger's account-setup, create/update, and delete orchestration.

Proposed solution

1. Mount the TransactionsPage with controlled API clients and child dialogs.
2. Cover no-account setup, saving a transaction into the grouped ledger, editing an existing entry, and confirmed deletion.
3. Keep the tests in the existing isolated test_web runner without exposing host ports.

Learner Coverage

No action — the verification gap was identified by a one-off feature review, not an OMP Learner issue.