The walkthrough panel that opens from the floating help button got a mobile rebuild and a desktop polish. On phones it's a full-screen sheet you can swipe through; on desktop you can fit a tall screenshot to your viewport or click any image to see it at native resolution. Six improvements to the in-app walkthroughs: Mobile bottom-sheet — On phones (< 768 px), tapping the floating help button now opens a full-screen sheet with a sticky Prev/Next footer, a scroll-snap tab strip, and 44 px touch targets — instead of a tiny floating panel you couldn't read. Body scroll is locked while the sheet is open; focus is trapped so screen readers stay inside the dialog. Swipe between slides — On mobile, swipe left or right on a guide slide to step through the walkthrough. The 50 px threshold prevents accidental scrolling from triggering navigation. Fit-to-screen toggle on desktop — A new toggle expands the guide panel to 90% of your viewport so tall screenshots (the long Settings page, the Drafts inbox) display end-to-end without a scrollbar. Your fit-to-screen preference persists across sessions. Click-to-zoom lightbox — Click any guide screenshot to view it at full native resolution in a lightbox. Press Esc, click the backdrop, or press the close button to dismiss. Keyboard-operable — Tab + Enter on the image, then Esc to close, with focus restored to where you were. Tablet support via touch events — Resizing and repositioning the guide panel now works via touch events on tablets, not just mouse drag. Panel position remembered across sessions — Where you put the guide panel — width, screen position, fit-to-screen state — persists in your browser. Comes back exactly where you left it. Plus a long-standing bug where the panel could drift offscreen on window resize is fixed.