fix(dao): document-totals recompute refreshes expression-calculated header fields (#6519)

[delchev]

Closes #6519.

Live failure: an issued, unpaid invoice printed an empty "TOTAL DUE" — Paid/Balance were NULL. The settlement rollup writes them only on allocation events, and expression-calculated fields were re-evaluated only on an explicit header save — while the totals they derive from move on every line change.

recalculate() (the targeted document-totals recompute that line repositories call after every item write) now additionally re-evaluates the header's expression-calculated calculatedOnUpdate fields via the shared Calc evaluator (null inputs read as 0 per its contract) and includes them in the same targeted updateProperties write — so balance = Total - Paid follows the totals from the first line onward and stays correct between allocations. Calculated actions are deliberately excluded: a server call-out may mint or mutate state and belongs to the explicit save/update paths only (documented in-code).

Authoring note (suite side): paid defaults to 0 and balance declares calculatedOnCreate/OnUpdate: "Total - Paid" — Calc identifiers are the PascalCase property names.

Test: IntentEmissionCoverageIT — the coverage document gains balanceDue calculated from its aggregate Amount; asserts the emitted repository persists the refreshed value in the recompute's targeted write, and at runtime posting a line makes the header's BalanceDue equal the line total immediately, with no header save in between. Full fixture compile+publish, 1/1 green locally.

Template-only — reaches deployed apps on regeneration.

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