Build 9: QR scan, camera fixes, first-run onboarding, sweep fixes

Camera/QR (validated live with a v4l2loopback virtual camera):
- decode non-MJPEG frames on Linux (raw YUYV was undecodable: eternal
  spinner), enumerate devices off the UI thread without unwrap, open
  cameras by their real device index (list position broke whenever
  /dev/video0 was absent), show "No camera found" after 5s
- scan-to-pay: QR button in the send recipient search row and the
  mobile home header; in-surface camera panel feeding recipient
  resolution; only text payloads accepted (seeds/slatepacks refused)
- receive QR was unscannable: full cells (0.5px gaps fragmented finder
  patterns at 4.5px cells), always ink-on-white plate (inverted codes
  fail many scanners), center mark 26% -> 19% (zbar chokes above);
  rqrr+zbar both decode the live card now; unit tests cover the exact
  widget geometry

First-run onboarding (replaces the stock empty state only; the wallet
list, add-wallet modal and GRIM creation flow stay for later wallets):
- intro -> node choice (Private integrated / Instant external with
  URL) -> create or restore (wraps MnemonicSetup; word grid, paste,
  SeedQR scan) -> optional @username claim with prominent skip
- fonts bind at creation context so frame one can use Geist families

Sweep fixes (22 confirmed findings, the simple ones):
- yellow theme: active sidebar nav was dark-on-dark (P1)
- window frame ring painted with theme bg: transparent clear color
  rendered as a black band without a compositor (P2)
- import/rotate identity inputs get visible field wells (P2)
- receive buttons: verb labels + transient "Copied" feedback
- review hero card fills the column; fee row copy; pay-tab stale and
  duplicated hints; unlock modal copy; node card subtitle truncation
- build number stays current (.git/logs/HEAD rerun trigger)

Backup restore: import accepts the export-time password and re-encrypts
under the current wallet password; cross-device restores work.

31 lib tests green. Mainnet-validated: both flows restored real
wallets; 0.1 grin sent B->A through NIP-17 over Tor with async
open/close ping-pong; tx 71fbfce4f591 posted on-chain.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/gui/views/wallets/content.rs

@@ -16,8 +16,8 @@ use eframe::epaint::RectShape;
 use egui::os::OperatingSystem;
 use egui::scroll_area::ScrollBarVisibility;
 use egui::{
-	Align, CornerRadius, CursorIcon, Id, Layout, Margin, OpenUrl, RichText, ScrollArea, Sense,
-	StrokeKind, UiBuilder,
+	Align, CornerRadius, CursorIcon, Id, Layout, Margin, OpenUrl, ScrollArea, Sense, StrokeKind,
+	UiBuilder,
 };
 use egui_async::Bind;
 use std::time::Duration;
@@ -25,10 +25,11 @@ use std::time::Duration;
 use crate::AppConfig;
 use crate::gui::Colors;
 use crate::gui::icons::{
-	ARROW_LEFT, BOOKMARKS, CALENDAR_CHECK, CLOUD_ARROW_DOWN, COMPUTER_TOWER, FOLDER_PLUS, GEAR,
-	GEAR_FINE, GLOBE, GLOBE_SIMPLE, LOCK_KEY, NOTEPAD, PLUS, SIDEBAR_SIMPLE, SUITCASE,
+	ARROW_LEFT, BOOKMARKS, CALENDAR_CHECK, CLOUD_ARROW_DOWN, COMPUTER_TOWER, GEAR, GEAR_FINE,
+	GLOBE, GLOBE_SIMPLE, LOCK_KEY, NOTEPAD, PLUS, SIDEBAR_SIMPLE, SUITCASE,
 };
 use crate::gui::platform::PlatformCallbacks;
+use crate::gui::views::goblin::onboarding::OnboardingContent;
 use crate::gui::views::settings::SettingsContent;
 use crate::gui::views::types::{
 	ContentContainer, LinePosition, ModalPosition, TitleContentType, TitleType,
@@ -64,6 +65,8 @@ pub struct WalletsContent {
 	wallet_content: WalletContent,
 	/// Wallet creation content.
 	creation_content: Option<WalletCreationContent>,
+	/// First-run onboarding content, shown while no wallets exist.
+	onboarding: Option<OnboardingContent>,
 
 	/// Settings content.
 	settings_content: Option<SettingsContent>,
@@ -95,6 +98,7 @@ impl Default for WalletsContent {
 			wallet_settings_content: WalletSettingsModal::new(ConnectionMethod::Integrated),
 			wallet_content: WalletContent::default(),
 			creation_content: None,
+			onboarding: None,
 			settings_content: None,
 			check_update: Bind::new(false),
 			update_info: (false, None),
@@ -194,16 +198,21 @@ impl ContentContainer for WalletsContent {
 		let showing_settings = self.showing_settings();
 		let creating_wallet = self.creating_wallet();
 		let showing_wallet = self.showing_wallet() && !creating_wallet && !showing_settings;
+		// First-run onboarding owns the surface while no wallets exist (and
+		// keeps it through its identity step, when the new wallet is already
+		// open but not yet selected).
+		let onboarding_active = !showing_wallet && self.onboarding_active();
 		let dual_panel = is_dual_panel_mode(ui);
 		let content_width = ui.available_width();
 		let list_hidden = showing_settings
 			|| creating_wallet
+			|| onboarding_active
 			|| self.wallets.list().is_empty()
 			|| (showing_wallet && (!dual_panel || !AppConfig::show_wallets_at_dual_panel()));
 
 		// Show title panel, except over the full-bleed Goblin wallet surface
-		// (it has its own header/navigation; lock + node info live there).
-		if !showing_wallet {
+		// and onboarding (they have their own header/navigation).
+		if !showing_wallet && !onboarding_active {
 			self.title_ui(ui, dual_panel, cb);
 		}
 
@@ -300,6 +309,8 @@ impl ContentContainer for WalletsContent {
 				},
 				fill: if self.showing_settings() {
 					Colors::fill_lite()
+				} else if onboarding_active {
+					Colors::fill()
 				} else {
 					Colors::fill_deep()
 				},
@@ -337,20 +348,17 @@ impl ContentContainer for WalletsContent {
 							self.select_wallet(w, None, cb);
 						}
 					}
-				} else if self.wallets.list().is_empty() {
-					View::center_content(ui, 350.0 + View::get_bottom_inset(), |ui| {
-						View::app_logo_name_version(ui);
-						ui.add_space(4.0);
-
-						let text = t!("wallets.create_desc");
-						ui.label(RichText::new(text).size(16.0).color(Colors::gray()));
-						ui.add_space(8.0);
-						// Show wallet creation button.
-						let add_text = format!("{} {}", FOLDER_PLUS, t!("wallets.add"));
-						View::button(ui, add_text, Colors::white_or_black(false), || {
-							self.show_add_wallet_modal();
-						});
-					});
+				} else if onboarding_active {
+					// First-run onboarding replaces the stock empty state;
+					// later wallets still use the list's add-wallet flow.
+					if self.onboarding.is_none() {
+						self.onboarding = Some(OnboardingContent::default());
+					}
+					let ob = self.onboarding.as_mut().unwrap();
+					if let Some(w) = ob.ui(ui, &mut self.wallets, cb) {
+						self.onboarding = None;
+						self.select_wallet(&w, None, cb);
+					}
 				} else {
 					return;
 				}
@@ -402,6 +410,14 @@ impl WalletsContent {
 		self.creation_content.is_some()
 	}
 
+	/// Check if first-run onboarding owns the surface (no wallets yet, or
+	/// the onboarding identity step is still finishing).
+	pub fn onboarding_active(&self) -> bool {
+		!self.showing_settings()
+			&& !self.creating_wallet()
+			&& (self.onboarding.is_some() || self.wallets.list().is_empty())
+	}
+
 	/// Check if application settings are showing.
 	pub fn showing_settings(&self) -> bool {
 		self.settings_content.is_some()

src/gui/views/wallets/creation/mnemonic.rs

@@ -133,7 +133,7 @@ impl MnemonicSetup {
 	}
 
 	/// Draw grid of words for mnemonic phrase.
-	fn word_list_ui(&mut self, ui: &mut egui::Ui, edit: bool) {
+	pub(crate) fn word_list_ui(&mut self, ui: &mut egui::Ui, edit: bool) {
 		ui.add_space(6.0);
 		ui.scope(|ui| {
 			// Setup spacing between columns.

src/gui/views/wallets/mod.rs

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-mod creation;
+pub(crate) mod creation;
 pub mod modals;
 
 mod content;