1## Tasks23- [x] Add responsive CSS breakpoint for narrow dashboard screens4- [x] Collapse spec browser grid to a single-column mobile layout5- [x] Make spec list horizontally scrollable on mobile6- [x] Stack diff columns and scenario before/after blocks on mobile7- [x] Wrap long spec paths, requirement names, scenario names, step text, and card titles8- [x] Reduce mobile modal/page padding and prevent page-level horizontal overflow9- [x] Add OpenSpec coverage for mobile-friendly spec layout