refactor(slint): extract DAC wizard into qbz-dac-wizard crate

First per-feature crate split off the qbz binary. `dac_wizard.rs` (794 LOC)
was the cleanest candidate: zero cross-feature module deps — it only used
qbz-ui generated types (AppWindow, DacWizardState, …), qbz-audio, qbz-models
and qbz-i18n. Moved verbatim into `qbz-dac-wizard/src/lib.rs` (import
`crate::` -> `qbz_ui::`); the bin now `use qbz_dac_wizard as dac_wizard;` so
its ~20 call sites in main.rs are unchanged. `cargo check -p qbz` green.

cc

crates/Cargo.lock

@@ -5531,6 +5531,7 @@ dependencies = [
  "qbz-cast",
  "qbz-core",
  "qbz-credentials",
+ "qbz-dac-wizard",
  "qbz-i18n",
  "qbz-integrations",
  "qbz-library",
@@ -5700,6 +5701,17 @@ dependencies = [
  "tokio",
 ]
 
+[[package]]
+name = "qbz-dac-wizard"
+version = "0.1.0"
+dependencies = [
+ "qbz-audio",
+ "qbz-i18n",
+ "qbz-models",
+ "qbz-ui",
+ "slint",
+]
+
 [[package]]
 name = "qbz-i18n"
 version = "0.1.0"

crates/Cargo.toml

@@ -23,6 +23,7 @@ members = [
     "qconnect-transport-ws",
     "qconnect-app",
     "qbz-ui",
+    "qbz-dac-wizard",
     "qbz",
     "qbz-credentials",
     "qbz-media-controls",

crates/qbz-dac-wizard/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "qbz-dac-wizard"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+repository.workspace = true
+description = "HiFi/DAC setup wizard controller (Slint) — extracted feature crate."
+
+[lib]
+name = "qbz_dac_wizard"
+path = "src/lib.rs"
+
+[dependencies]
+qbz-ui = { path = "../qbz-ui" }
+qbz-audio = { path = "../qbz-audio" }
+qbz-models = { path = "../qbz-models" }
+qbz-i18n = { path = "../qbz-i18n" }
+slint = { version = "=1.16.1", default-features = false, features = ["std", "compat-1-2"] }

crates/qbz-dac-wizard/src/lib.rs

@@ -11,7 +11,7 @@ use std::sync::Mutex;
 use qbz_audio::{AudioStackHealth, Distro, InitSystem};
 use slint::{ComponentHandle, Model, ModelRc, VecModel};
 
-use crate::{AppWindow, DacCandidateRow, DacConfigRow, DacWizardState, RemediationRow};
+use qbz_ui::{AppWindow, DacCandidateRow, DacConfigRow, DacWizardState, RemediationRow};
 
 // Last probe result, so a distro override recomputes commands without
 // re-shelling on every dropdown change.

crates/qbz/Cargo.toml

@@ -46,6 +46,7 @@ slint = { version = "=1.16.1", default-features = false, features = [
 i-slint-backend-winit = "=1.16.1"
 qbz-music-link = { path = "../qbz-music-link" }
 qbz-ui = { path = "../qbz-ui" }
+qbz-dac-wizard = { path = "../qbz-dac-wizard" }
 log = { workspace = true }
 env_logger = "0.11"
 tokio = { workspace = true }

crates/qbz/src/main.rs

@@ -40,7 +40,7 @@ mod favorites;
 mod favorites_prefs;
 mod foryou;
 mod genre_filter;
-mod dac_wizard;
+use qbz_dac_wizard as dac_wizard;
 mod home;
 mod immersive;
 mod info_modals;