Level Layout Update — Tank 99 Steam update #1355707

Campaign Rework Rebuilt the 99-stage campaign with a curated mix of 50 handcrafted maps and 49 procedural stages Handcrafted and procedural levels are interleaved for better pacing and variety across the run Procedural stages now use fixed layouts per stage, so retries stay consistent Stage Highlights Stage 2 now uses a special showcase map (relocated from the old final-stage layout) Stage 99 is the dedicated finale, built around the asymmetric map_50 boss arena Removed duplicate stage files that repeated existing layouts without adding new content