KeelrLeek
8017c0d877
The bar was rendered by each view, so `<CurrentView />` swapping on every
navigation destroyed it and built a new one. Measured: the `.glassbar`
element is not the same node on either side of an artist -> album move, and
the old one is disconnected.
That broke the crumb entrance animation, which is what this was noticed
from. The `seen` set exists so only a genuinely ARRIVING crumb slides in,
and it is component state -- so it was empty on every mount and every crumb
looked new. Instrumenting Element.animate across one navigation:
AC/DC -> Highway to Hell should animate: the album
actually animated: all three crumbs
Back to AC/DC should animate: nothing
actually animated: both crumbs
So the whole trail re-flew in from the right on every page change, and Back
animated crumbs that had never left -- the exact opposite of the
direction-of-travel cue the animation was written for.
The bar is app chrome, not part of a page, so App.svelte now mounts it once
as the scroll pane's first child and pages no longer carry it. Views that
do not show it yet hide it with `display: none` rather than an {#if}: the
element leaves the layout and measures zero -- scrollbar.js reads this
bar's height to start the thumb below it, and correctly gets 0 -- while the
component stays alive and keeps its crumb memory across the round trip.
Geometry is unchanged, which the negative-margin bleed made easy to get
wrong: the bar's net flow height is zero either way, so moving it from
first-child-of-the-page to previous-sibling-of-the-page leaves the page's
top exactly where it was. Verified against the live pane -- bar top/left/
width flush with the pane and 46 high, page top at pane + 24, z-index 40
and elementFromPoint at the bar's centre still returning the bar rather
than the hero underneath.
After: arriving at an album animates only the album's own crumb, Back
animates nothing, and a trip out to Library and back animates nothing. The
backdrop-filter layer is no longer recomposited on every page change, and a
bar element can now transition between pages at all, which was impossible
when each side was a different node.
Two consequences worth stating. The resolver pulse takes the GLOBAL accent
everywhere now; on the album page it used to inherit that page's extracted
palette, because the bar sat inside `.album-page`. The artist page always
gave it the global accent, so the two now agree rather than disagreeing.
And putting the bar on the remaining pages is now widening BAR_VIEWS plus
deciding how it sits against each page's existing header -- the mounting
question is settled.
85 JS tests pass.