Task: Scaffold story: Codegen support for view groups (Qt detail-dialog tabs)

Scaffold the story's documents (story, tasks, test scenarios), wire it into the sprint, and raise the initial scaffold PR — so the substantive implementation tasks start with the docs skeleton and PR already in place.

• [X] Story and its three tasks scaffolded with compass add, wired into sprint.org.
• [X] Pre-codegen currency tab grouping recovered from git history and written into the story's Acceptance and the tasks' Plans.
• [X] Scaffold PR (#1488) raised.

(Implementation strategy. Written when work starts; key decisions are distilled into the parent story's * Decisions at close, but the plan itself stays — it is the historical record of what we did.)

Manual QA scenarios (scaffolded via compass add test_scenario, run through the QA Validation Runner panel) that verify this task. Link new ones here as they're created; the scenario doc itself links back via its "Verifies task" field.

Story scaffolded with three substantive tasks (codegen schema/template work, currency pilot, manual update). Investigated the pre-codegen CurrencyDetailDialog.ui via git history (commit 72c623f75^) and recovered the exact original tab/field grouping (General, Formatting, Rounding, Provenance) plus the existing-but-unembedded currency_details_rounding.png screenshot gap — both written into the story's Acceptance and the individual tasks' Plans so the actual implementation work starts with full context rather than needing to re-derive it.