feat: AI disclaimer modal, admin cost/status fixes, quota-aware submission detail

fix: remove min-height from fb-steps so modal box fits tightly to content

fix: feedback.js crashes with null on addEventListener

fix: feedback scroll trigger never fires due to removed listener + async race

fix: feedback modal scroll trigger not firing on review page

feat: replace inline feedback form with step-by-step modal on review page

feat: rebrand to PaperMate, ARR review rubric, feedback form, UI improvements