2b5e3b3576
- grid.rs: honour view.number_format (",.0" default, ",.2", ".4", etc.)
via parse_number_format/format_f64(n,comma,decimals); format_f64 now
pub so callers can reuse the same formatting logic.
- app.rs: n/N actually navigate to next/prev search match (cross-product
aware); fix dead unreachable N arm; add :set-format / :fmt command to
change the active view's number_format at runtime.
- persistence/mod.rs: CSV export now uses full cross-product of all
row/col-axis categories, matching grid rendering behaviour.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>