Add the three missing first-class design prototypes and retire the stale
iOS/OSX-SSO framing so designs/ (the authoritative visual+behavior contract)
matches the current single-PWA reality.
- add designs/campaigns.html (facets/preview/launch; core prospecting feature)
- add designs/markets.html (tour-market stats: peak hours/days, conversion)
- add designs/control.html (GO/PAUSE/AWAY kill-switch, digest, activity, held)
- rewrite designs/index.html: PWA-only hub, drop iOS/OSX/SSO, link all 9 designs
- remove designs/ios-prospector-tab.html (Swift target dropped in bcbd558)
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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