* Add budget rollover: copy from previous month
When navigating to an uninitialized budget month, show a prompt
offering to copy amounts from the most recent initialized budget.
Copies budgeted_spending, expected_income, and all matching category
allocations. Also fixes over-allocation warning showing on uninitialized
budgets.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
* Redirect copy_previous to categories wizard for review
Matches the normal budget setup flow (edit → categories → show)
so users can review/tweak copied allocations before confirming.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
* Address code review: eager-load categories, guard against overwrite
- Add .includes(:budget_categories) to most_recent_initialized_budget
to avoid N+1 when copy_from! iterates source categories
- Guard copy_previous action against overwriting already-initialized
budgets (prevents crafted POST from clobbering existing data)
- Add i18n key for already_initialized flash message
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
* Add invariant guards to copy_from! for defensive safety
Validate that source budget belongs to the same family and precedes
the target budget before copying. Protects against misuse from
other callers beyond the controller.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
* Fix button overflow on small screens in copy previous prompt
Stack buttons vertically on mobile, side-by-side on sm+ breakpoint.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
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