Onboarding tour (tourEngine.js):
- On narrow viewports (<640px) dock the popover as a fixed BOTTOM SHEET
instead of anchoring it — kills the off-screen/jump-to-center glitches
caused by short viewports, wrapping buttons and URL-bar resize. The
spotlight still highlights the target, scrolled to center so it sits above
the sheet.
- On desktop, measure the ACTUAL popover size (getBoundingClientRect) and
feed it to computeTourPlacement, instead of the fixed 240/336 guesses that
pushed tall popovers off-screen.
Profile modal mobile tab grid (CSS):
- Equal-height tiles via a min-height token + centered content, so long
labels no longer leave a ragged grid.
- Move the unread dot to the tile's top-right corner (was landing in the
grid gutter at the vertical-nav left edge).
- Tighter line-height/padding + non-shrinking glyph.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
