Adds fusion.period.picker.wizard - a guided entry point that lets users
pick a report type and a common period preset (this/last month, quarter,
YTD, last year, or custom range). The wizard uses the existing date_periods
service helpers (month_bounds, quarter_bounds, fiscal_year_bounds) to
pre-fill date_from / date_to via @api.onchange.
action_open_report returns a client action that launches the OWL reports
viewer with default_report_type / default_date_from / default_date_to /
default_comparison in the context.
Tests: 3 new (test_period_picker.py). Net 111 -> 114.
Made-with: Cursor
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