M1 progress. Adds the post-login shell: HeaderBar (nav tabs and
search), Sidebar (playlists list and user card), PlayerBar (transport,
now-playing, volume), and AppShell composing them with the content
region as a placeholder.
app.slint gains an AppScreen enum; clicking sign-in or start-offline
navigates login -> shell (no real auth yet — that is M2). New layout
foundation tokens (sidebar width, header/player-bar heights) plus
border and hover semantic colors.
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M1 progress. Adds the foundation token layer (palette, semantic
colors, spacing, radius, typography) bound to the QBZ dark theme,
three primitives (QbzCheckbox, QbzPrimaryButton, QbzTextLink), and
the LoginScreen feature component.
The login screen mirrors the Svelte LoginView: centered card, logo,
QBZ wordmark, Qobuz ToS checkbox, "Sign in via Browser" button,
system-browser and offline links, and the legal disclaimer. Colors
are lifted verbatim from src/app.css; strings use @tr() markers.
Rust side: typed AppCommand enum; UI callbacks dispatch through it.
M2 wires the command handler to AppRuntime.
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First increment of M1 of the Slint functional POC. Adds the qbz-slint
workspace member: Slint 1.x dependency, build.rs compiling ui/app.slint,
a minimal AppWindow, and the binary entry point.
Verifies the Slint toolchain builds in this environment before the
foundation layer (tokens, shell, theme, i18n, typed commands) lands.
Private slint-poc branch only (ADR-007).
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