fix(pathways): chapter-click confirm popup + mobile slide-text default

fix(pathways): course picker becomes a modal dialog

fix(pathways): per-chapter furthest-slide marker on chapter cards

fix(tutor): hide floating opener while on Learning screen

fix(pathways): drop "Rendering slide visual…" loading flicker

fix(pathways): duplicate Prev/Next at the bottom of the slide

fix(pathways): hide Change Course + course label + picker on sidebar collapse

fix(pathways): drop fixed min-heights so the slide stage hugs content

fix(sidebar): anchored 48px gutter with round toggle when collapsed

fix(animation): hide anim-math-display when empty to suppress flash

fix(mobile): sticky category chips inside scroll-bound sidebar strip

fix(mobile): raise tutor toggle to bottom:120px to clear bottom-right content

fix(sidebar): replace ▶ collapsed-toggle glyph with "Show" label

fix(mobile): hide pathways sidebar-toggle on <=768px

fix(mobile): keep sidebar visible + reposition tutor toggle (768px)

mobile: add @media (max-width: 768px) responsive block

Prepare for open source release v1.0.0

Initial commit