Safer Remix Style proof slides

Remix Style generation is more careful with proof slides.

When a source includes a real stat, rating, or measurable proof point, SlideDrift can still use that evidence in a proof or stat slide. When the source does not include that evidence, the generator now uses more qualitative wording and avoids turning unsupported numbers into user-facing proof.

This makes Remix Style drafts safer to review because generated decks are less likely to present invented percentages, ratings, revenue figures, or time-savings claims as if they came from your source.