Brings the JUMP TO bar from a visual placeholder to a working nav,
plus two interaction fixes the user flagged on the previous build.
JUMP TO bar — functional scroll-to:
- JumpNavTab gains an `anchor-y: length` field. JumpNavBar's
tab-clicked callback now emits (id, anchor-y); the parent
(ArtistPageView) scrolls page-flickable to land the section
just below the sticky bar.
- Tab list is built in Rust (`build_jump_tabs` in artist.rs)
from the artist's actual data and pushed to a new
`ArtistState.jump-tabs` model. Tabs are emitted only for
sections that exist (top tracks present, "Discography" /
"EPs & Singles" / "Live Albums" / "Compilations" / "Others"
only when the corresponding release_sections entry is there);
the Playlists tab — not implemented yet — never appears.
- anchor-y estimates use layout-derived constants per section
type (popular-tracks header + visible row count, release grid
headers + ceil(album_count / 5) rows). Not pixel-perfect for
long bios or grids that wrap differently, but lands the
viewport inside the right section.
- Removed the hardcoded ArtistPageView property — tabs and
visibility are now data-driven.
Sticky positioning — dynamic:
- jump-nav.natural-top now binds to
`body-row.absolute-position.y - page-flickable.absolute-y -
self.height`, so the bar always sits flush in the gap above
the body row regardless of artist-header height (long-bio
artists stop pushing the row out from under the bar).
- Sidebar natural-top follows the same body-row anchor, so it
too tracks where the body actually starts.
Search input UX:
- The outer search-icon slot is now removed from layout (via
`if !search-open`, not `visible:`) when the input opens, so
the expanded input runs all the way to the bar's right
padding — right under the user's cursor where the lupa just
was, no leftover gap on the right.
- `changed search-open` auto-focuses the inline TextInput, so
typing starts immediately after clicking the lupa with no
second click in the input.
cc
vicrodh
06a763443a