Startup blocked on Qobuz's ~7 MB web bundle download with no cache or
timeout, so a slow CDN left the app on a blank screen for 25-30s before
the login screen appeared. Cache the extracted tokens on disk (keyed by
bundle version), apply them instantly on warm starts and refresh in the
background, and bound the cold fetch with a per-request timeout + retry.
The legacy api client shares the same cache. Emits BundleFetchStarted so
the UI can show a connecting state on the first run.
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Task 2 of the Slint POC readiness audit. AppRuntime now performs
framework-agnostic per-user session activation: activate, activate_at,
activate_offline, deactivate, plus is_session_active, active_user_id,
and a with_session_store accessor.
This is the minimal version per the 2026-05-18 audit correction. It
opens only the session store and does the portable scaffolding (user
paths, directories, last_user_id marker, runtime state machine). It
does not touch Tauri's session_lifecycle, does not initialize the
src-tauri-side per-user stores, and does not run the flat-to-user
migration. The shipping app keeps identical behavior; this is additive.
activate_at takes explicit directories and is the testable core;
activate resolves real per-user paths through UserDataPaths.
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Adds a framework-agnostic composition root for non-Tauri UI shells
(Slint, TUI, headless) as Task 1 of the Slint POC readiness audit
(session-20-slint-poc-readiness-audit).
AppRuntime<A> owns an Arc<QbzCore<A>> plus the runtime state machine,
built with the same recipe as the Tauri CoreBridge but with no Tauri
dependency. Scope is composition and accessors only; per-user store
ownership and session activation are deferred to Task 2.
qbz-app now depends on qbz-core, qbz-player, qbz-audio, and qbz-models.
The Tauri app does not consume this module; it is purely additive.
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NVIDIA-only systems no longer get a hardware-acceleration recommendation that visibly stutters under WebKitGTK. The three NVIDIA-only branches (Wayland+GNOME, Wayland, X11) collapse into one CPU-rendering profile, since XWayland does not rescue the stutter either.
NVIDIA + iGPU hybrid now allows DMA-BUF: WebKit composites on the stable iGPU stack, so the instability that affects NVIDIA-only systems does not apply. The recommendation also tells the user to pick the iGPU explicitly in the rendering GPU selector instead of Auto.
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